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november ? 29, ? 2012 ??? | ? final ? datasheet 1 IR3553 40a ? integrated ? powirstage? ? features ? ? peak ? efficiency ? up ? to ? 93.2% ? at ? 1.2v ? ? integrated ? driver, ? control ? mosfet, ? synchronous ? mosfet ? and ? schottky ? diode ? ? input ? voltage ? (vin) ? operating ? range ? up ? to ? 15v ? ? output ? voltage ? range ? from ? 0.25v ? up ? to ? 3.3v ? ? output ? current ? capability ? of ? 40a ? dc ? ? operation ? up ? to ? 1.0mhz ? ? integrated ? current ? sense ? amplifier ? ? vcc ? under ? voltage ? lockout ? ? thermal ? flag ? ? body \ braking? ? load ? transient ? support ? ? diode \ emulation ? high ? efficiency ? mode ? ? compatible ? with ? 3.3v ? pwm ? logic ? and ? vcc ? tolerant ? ? compliant ? with ? intel ? drmos ? v4.0 ? ? pcb ? footprint ? compatible ? with ? ir3550 ? and ? ir3551 ? ? efficient ? dual ? sided ? cooling ? ? small ? 4mm ? x ? 6mm ? x ? 0.9mm ? pqfn ? package ? ? lead ? free ? rohs ? compliant ? package ? applications ? ? voltage ? regulators ? for ? cpus, ? gpus, ? and ? ddr ? memory ? arrays ? ? high ? current, ? low ? profile ? dc \ dc ? converters ? ? basic ? application ? sw pwm vin pgnd vcc vcc boost vin vout pwm csin+ csin \ 4.5v ? to ? 7v lgnd iout iout bbrk# bbrk# refin refin 4.5v ? to ? 15v IR3553 phsflt# phsflt# ? figure ? 1: ? IR3553 ? basic ? application ? circuit ? description ? the ? IR3553 ? integrated ? powirstage? ? is ? a ? synchronous ? buck ? gate ? driver ? co \ packed ? with ? a ? control ? mosfet ? and ? a ? synchronous ? mosfet ? with ? integrated ? schottky ? diode. ? it ? is ? optimized ? internally ? for ? pcb ? layout, ? heat ? transfer ? and ? driver/mosfet ? timing. ? custom ? designed ? gate ? driver ? and ? mosfet ? combination ? enables ? higher ? efficiency ? at ? lower ? output ? voltages ? required ? by ? cutting ? edge ? cpu, ? gpu ? and ? ddr ? memory ? designs. ?? up ? to ? 1.0mhz ? switching ? frequency ? enables ? high ? performance ? transient ? response, ? allowing ? miniaturization ? of ? output ? inductors, ? as ? well ? as ? input ? and ? output ? capacitors ? while ? maintaining ? industry ? leading ? efficiency. ? the ? IR3553?s ? superior ? efficiency ? enables ? smallest ? size ? and ? lower ? solution ? cost. ? the ? IR3553 ? pcb ? footprint ? is ? compatible ? with ? the ? ir3550 ? (60a) ? and ? the ? ir3551 ? (50a). ? integrated ? current ? sense ? amplifier ? achieves ? superior ? current ? sense ? accuracy ? and ? signal ? to ? noise ? ratio ? vs. ? best \ in \ class ? controller ? based ? inductor ? dcr ? sense ? methods. ? the ? IR3553 ? incorporates ? the ? body \? braking? ? feature ? which ? enables ? reduction ? of ? output ? capacitors. ? synchronous ? diode ? emulation ? mode ? in ? the ? IR3553 ? removes ? the ? zero \ current ? detection ? burden ? from ? the ? pwm ? controller ? and ? increases ? system ? light \ load ? efficiency. ? the ? IR3553 ? is ? optimized ? specifically ? for ? cpu ? core ? power ? delivery ? in ? server ? applications. ? the ? ability ? to ? meet ? the ? stringent ? requirements ? of ? the ? server ? market ? also ? makes ? the ? IR3553 ? ideally ? suited ? to ? powering ? gpu ? and ? ddr ? memory ? designs ? and ? other ? high ? current ? applications. ? figure ? 2: ? typical ? IR3553 ? efficiency ? & ? power ? loss ? (see ? note ? 2 ? on ? page ? 8) ? 74 76 78 80 82 84 86 88 90 92 94 0 5 10 15 20 25 30 35 40 output ? current ? (a) efficiency ? (%) ? 0 2 4 6 8 10 12 14 16 18 20 power ? loss ? (w)
november ? 29, ? 2012 ??? | ? final ? datasheet 2 IR3553 40a ? integrated ? powirstage? ? pinout ? diagram ? ? ? figure ? 3: ? IR3553 ? pin ? diagram, ? top ? view ? ordering ? information ?? ? package ? tape ? & ? reel ? qty ? part ? number ? pqfn, ? 25 ? lead ? 4mm ? x ? 6mm ? 3000 ? IR3553mtrpbf ? package ? qty ? part ? number ? pqfn, ? 25 ? lead ? 4mm ? x ? 6mm ? 100 ? IR3553mpbf ? ? ? ? typical ? application ? diagram ? ? sw pwm vin pgnd gate ? drivers ? and ? current sense ? amplifier lgnd vcc phsflt# iout vcc boost vin pwm iout phsflt# bbrk# bbrk# refin refin csin \ csin+ IR3553 4.5v ? to ? 7v 4.5v ? to ? 15v c2 10uf ? x ? 2 c5 0.22uf c3 1uf r1 10k c4 0.22uf r2 2.49k l1 150nh 3 14 \ 16 17 18 19 20 22 21 23 1 2 12, ? 13 6 \ 11 c1 0.1uf pgnd 4 24 tgnd no ? connect c8 1nf c9 22nf optional ? for ? diode ? emulation ? setup vout c7 470uf c6 22uf ? ? figure ? 4: ? application ? circuit ? with ? current ? sense ? amplifier ? ? ?? ? ?
november ? 29, ? 2012 ??? | ? final ? datasheet 3 IR3553 40a ? integrated ? powirstage? ? typical ? application ? diagram ? (continued) ? sw pwm vin pgnd gate ? drivers ? and ? current sense ? amplifier iout vcc phsflt# vcc boost vin pwm refin phsflt# bbrk# bbrk# cs+ lgnd csin \ csin+ IR3553 4.5v ? to ? 7v 4.5v ? to ? 15v c2 10uf ? x ? 2 c5 0.22uf c3 0.1uf r1 10k c4 0.22uf r2 2.49k l1 150nh 3 14 \ 16 17 18 19 20 21 23 22 12 12, ? 13 6 \ 11 c1 0.1uf pgnd 4 24 tgnd no ? connect cs \ vout c7 470uf c6 22uf ? ? figure ? 5: ? application ? circuit ? without ? current ? sense ? amplifier ? ? functional ? block ? diagram ? pwm 6 7 8 9 10 11 14 15 16 vin vin vin sw sw sw sw sw sw 1 4 12 13 csin \ pgnd pgnd pgnd 17 boost power \ on ? reset ? (por), 3.3v ? reference, and ? dead \ time ? control 19 iout 23 vcc 3 bbrk# 20 25 5 gatel gatel driver driver 18 phsflt# 2 csin+ 21 lgnd 22 refin current ? sense ? amplifier mosfet & ? thermal ? detection s ????? q r por 3.3v vcc \ + 3.3v 24 tgnd ? figure ? 6: ? IR3553 ? functional ? block ? diagram ?
november ? 29, ? 2012 ??? | ? final ? datasheet 4 IR3553 40a ? integrated ? powirstage? ? pin ? descriptions ? ? pin # pin name pin description 1 ? csin \? inverting ? input ? to ? the ? current ? sense ? amplifier. ? connect ? to ? lgnd ? if ? the ? current ? sense ? amplifier ? is ? not ? used. ? 2 ? csin+ ? non \ inverting ? input ? to ? the ? current ? sense ? amplifier. ? connect ? to ? lgnd ? if ? the ? current ? sense ? amplifier ? is ? not ? used. ? 3 ? vcc ? bias ? voltage ? for ? control ? logic. ? connect ? a ? minimum ? 1uf ? cap ? between ? vcc ? and ? pgnd ? (pin ? 4) ? if ? current ? sense ? amplifier ? is ? used. ? connect ? a ? minimum ? 0.1uf ? cap ? between ? vcc ? and ? pgnd ? (pin ? 4) ? if ? current ? sense ? amplifier ? is ? not ? used. ? 4, ? 12, ? 13 ? pgnd ? power ? ground ? of ? mosfet ? driver ? and ? the ? synchronous ? mosfet. ?? mosfet ? driver ? signal ? is ? referenced ? to ? this ? pin. ??? 5, ? 25 ? gatel ? low \ side ? mosfet ? driver ? pins ? that ? can ? be ? connected ? to ? a ? test ? point ? in ? order ? to ? observe ? the ? waveform. ??? 6 ? ? ? 11 ? sw ? switch ? node ? of ? synchronous ? buck ? converter. ? 14 ? ? ? 16 ? vin ? high ? current ? input ? voltage ? connection. ?? recommended ? operating ? range ? is ? 4.5v ? to ? 15v. ? connect ? at ? least ? two ? 10uf ? 1206 ? ceramic ? capacitors ? and ? a ? 0.1uf ? 0402 ? ceramic ? capacitor. ? place ? the ? capacitors ? as ? close ? as ? possible ? to ? vin ? pins ? and ? pgnd ? pins ? (12 \ 13). ? the ? 0.1uf ? 0402 ? capacitor ? should ? be ? on ? the ? same ? side ? of ? the ? pcb ? as ? the ? IR3553. ? 17 ? boost ? bootstrap ? capacitor ? connection. ? the ? bootstrap ? capacitor ? provides ? the ? charge ? to ? turn ? on ? the ? control ? mosfet. ? connect ? a ? minimum ? 0.22f ? capacitor ? from ? boost ? to ? sw ? pin. ? place ? the ? capacitor ? as ? close ? to ? boost ? pin ? as ? possible ? and ? minimize ? the ? parasitic ? inductance ? of ? the ? connection ? from ? the ? capacitor ? to ? sw ? pin. ?? 18 ? phsflt# ? open ? drain ? output ? of ? the ? phase ? fault ? circuits. ? connect ? to ? an ? external ? pull \ up ? resistor. ? output ? is ? low ? when ? a ? mosfet ? fault ? or ? over ? temperature ? condition ? is ? detected. ? 19 ? pwm ? 3.3v ? logic ? level ? tri \ state ? pwm ? input ? and ? 7v ? tolerant. ? ?high? ? turns ? the ? control ? mosfet ? on, ? and ? ?low? ? turns ? the ? synchronous ? mosfet ? on. ? ?tri \ state? ? turns ? both ? mosfets ? off ? in ? body \ braking? ? mode. ? in ? diode ? emulation ? mode, ? ?tri \ state? ? activates ? internal ? diode ? emulation ? control. ? see ? ?pwm ? tri \ state ? input? ? section ? for ? further ? details ? about ? the ? pwm ? tri \ state ? functions. ? 20 ? bbrk# ? 3.3v ? logic ? level ? input ? and ? 7v ? tolerant ? with ? internal ? weak ? pull \ up ? to ? 3.3v. ? logic ? low ? disables ? both ? mosfets. ? pull ? up ? to ? vcc ? if ? body \ braking ? ? is ? not ? used. ?? pulling ? bbrk# ? low ? at ? least ? 20ns ? after ? vcc ? passes ? its ? uvlo ? threshold ? selects ? internal ? diode ? emulation ? control. ? see ? ?body \ braking ? ? mode? ? section ? for ? further ? details. ? 21 ? lgnd ? signal ? ground. ?? driver ? control ? logic, ? analog ? circuits ? and ? ic ? substrate ? are ? referenced ? to ? this ? pin. ? 22 ? refin ? reference ? voltage ? input ? from ? the ? pwm ? controller. ? iout ? signal ? is ? referenced ? to ? the ? voltage ? on ? this ? pin. ? connect ? to ? lgnd ? if ? the ? current ? sense ? amplifier ? is ? not ? used. ? 23 ? iout ? current ? output ? signal. ? voltage ? on ? this ? pin ? is ? equal ? to ? v(refin) ? + ?? 32.5 ? * ? [v(csin+) ? ? ? v(csin \ )]. ? float ? this ? pin ? if ? the ? current ? sense ? amplifier ? is ? not ? used. ? 24 ? tgnd ? this ? pin ? is ? connected ? to ? internal ? power ? and ? signal ? ground ? of ? the ? driver. ?? for ? best ? performance ? of ? the ? current ? sense ? amplifier, ? tgnd ? must ? be ? electrically ? isolated ? from ? power ? ground ? (pgnd) ? and ? signal ? ground ? (lgnd) ? in ? the ? pcb ? layout. ???
november ? 29, ? 2012 ??? | ? final ? datasheet 5 IR3553 40a ? integrated ? powirstage? ? absolute ? maximum ? ratings ? ? stresses ? beyond ? those ? listed ? under ? ?absolute ? maximum ? ratings? ? may ? cause ? permanent ? damage ? to ? the ? device. ? these ? are ? stress ? ratings ? only ? and ? functional ? operation ? of ? the ? device ? at ? these ? or ? any ? other ? conditions ? beyond ? those ? indicated ? in ? the ? operational ? sections ? of ? the ? specifications ? are ? not ? implied. ? pin ? number ? pin ? name ? v max ? v min ? i source ? i sink ? 1 ? csin \? vcc ? + ? 0.3v ? \ 0.3v ? 1ma ? 1ma ? 2 ? csin+ ? vcc ? + ? 0.3v ?\ 0.3v ? 1ma ? 1ma ? 3 ? vcc ? 8v ? \ 0.3v ? na ? 5a ? for ? 100ns, ? 200ma ? dc ? 4 ? pgnd ? 0.3v ?\ 0.3v ? 15ma ? 15ma ? 5, ? 25 ? gatel ? vcc ? + ? 0.3v ? \ 3v ? for ? 20ns, ? \ 0.3v ? dc ? 1a ? for ? 100ns, ? 200ma ? dc ? 1a ? for ? 100ns, ? 200ma ? dc ? 6 \ 11 ? sw ? 2 ? 25v ? \ 5v ? for ? 20ns, ? \ 0.3v ? dc ? 45a ? rms ? 20a ? rms ? 12, ? 13 ? pgnd ? na ? na ? 20a ? rms ? 45a ? rms ? 14 \ 16 ? vin ? 2 ? 25v ?\ 0.3v ? 5a ? rms ? 15a ? rms ? 17 ? boost ? 1 ? 33v ? \ 0.3v ? 1a ? for ? 100ns, ? 100ma ? dc ? 5a ? for ? 100ns, ? 100ma ? dc ? 18 ? phsflt# ? vcc ? + ? 0.3v ?\ 0.3v ? 1ma ? 20ma ? 19 ? pwm ? vcc ? + ? 0.3v ? \ 0.3v ? 1ma ? 1ma ? 20 ? bbrk# ? vcc ? + ? 0.3v ?\ 0.3v ? 1ma ? 1ma ? 21 ? lgnd ? 0.3v ? \ 0.3v ? 15ma ? 15ma ? 22 ? refin ? 3.5v ?\ 0.3v ? 1ma ? 1ma ? 23 ? iout ? vcc ? + ? 0.3v ? \ 0.3v ? 5ma ? 5ma ? 24 ? tgnd ? 0.3v ? \ 0.3v ? na ? na ? ? note: ? 1. ?? maximum ? boost ? ? ? sw ? = ? 8v. ? 2. ? maximum ? vin ? ? ? sw ? = ? 25v. ? 3. ????? all ? the ? maximum ? voltage ? ratings ? are ? referenced ? to ? pgnd ? (pins ? 12 ? and ? 13). ? ? ? thermal ? information ? thermal ? resistance, ? junction ? to ? top ? ( jc_top ) ? 23.2 ? c/w ? thermal ? resistance, ? junction ? to ? pcb ? (pin ? 13) ? ( jb ) ? 2.5 ? c/w ? thermal ? resistance ? ( ja ) 1 ? 22.2 ? c/w ? maximum ? operating ? junction ? temperature ? 0 ? to ? 150c ? maximum ? storage ? temperature ? range ? \ 65c ? to ? 150c ? esd ? rating ? hbm ? class ? 1b ? jedec ? standard ? msl ? rating ? 3 ? reflow ? temperature ? 260c ? note: ? 1. ?? thermal ? resistance ? ( ja ) ? is ? measured ? with ? the ? component ? mounted ? on ? a ? high ? effective ? thermal ? conductivity ? test ? board ? in ? free ? air. ? refer ? to ? international ? rectifier ? application ? note ? an \ 994 ? for ? details. ?
november ? 29, ? 2012 ??? | ? final ? datasheet 6 IR3553 40a ? integrated ? powirstage? ? electrical ? specifications ? the ? electrical ? characteristics ? involve ? the ? spread ? of ? values ? guaranteed ? within ? the ? recommended ? operating ? conditions. ? typical ? values ? represent ? the ? median ? values, ? which ? are ? related ? to ? 25c. ? recommended ? operating ? conditions ? for ? reliable ? operation ? with ? margin ? parameter ? symbol ? min ? max ? unit ? recommended ? vin ? range ? vin ? 4.5 ? 15 ? v ? recommended ? vcc ? range ? vcc ? 4.5 ? 7 ? v ? recommended ? refin ? range ? refin ? 0.25 ? vcc ? ? ? 2.5 ? v ? recommended ? switching ? frequency ? ? sw ? 200 ? 1000 ? khz ? recommended ? operating ? junction ? temperature ? t j ? 0 ? 125 ? c ? ? electrical ? characteristics ? parameter ? symbol ? conditions ? min ? typ ? max ? unit ? efficiency ? note ? 2. ? see ? figure ? 2. ?? 92.7 ?? % ? IR3553 ? peak ? efficiency ? note ? 1 ?? note ? 3. ? see ? figure ? 7. ?? 92.2 ?? % ? pwm ? comparator ? pwm ? input ? high ? threshold ? v pwm_high ?? pwm ? tri \ state ? to ? high ?? 2.5 ?? ? v ? pwm ? input ? low ? threshold ? v pwm_low ?? pwm ? tri \ state ? to ? low ??? 0.8 ? v ?? pwm ? tri \ state ? float ? voltage ? v pwm_tri ? pwm ? floating ?? 1.2 ? 1.65 ? 2.1 ? v ?? hysteresis ? v pwm_hys ?? active ? to ? tri \ state ? or ? tri \ state ? to ? active, ? note ? 1 ? 65 ? 76 ? 100 ? mv ?? pwm ? tri \ state ? to ? low ? transition ? to ? gatel ? >1v ?? ? 38 ?? ns ?? tri \ state ? propagation ? delay ? t pwm_delay ? pwm ? tri \ state ? to ? high ? transition ? to ? gateh ? >1v ? ? 18 ?? ns ? pwm ? sink ? impedance ? r pwm_sink ? ? 3.67 ? 5.1 ? 8.70 ? k ? pwm ? source ? impedance ? r pwm_source ? ? 3.67 ? 5.1 ? 8.70 ? k ? internal ? pull ? up ? voltage ? v pwm_pullup ? vcc ? > ? uvlo ?? 3.3 ?? v ? minimum ? pulse ? width ? t pwm_min ? note ? 1 ?? 41 ? 58 ? ns ? current ? sense ? amplifier ? csin+/ \? bias ? current ?? i csin_bias ?? \ 100 ? 0 ? 100 ? na ? csin+/ \? bias ? current ? mismatch ?? i csin_biasmm ?? \ 50 ? 0 ? 50 ? na ? calibrated ? input ? offset ? voltage ?? v csin_offset ? self \ calibrated ? offset, ?? 0.5v ?? v(refin) ?? 2.25v ? ? 450 ?? ? ? v ? gain ?? g cs ? 0.5v ?? v(refin) ?? 2.25v ? 30.0 ?? 32.5 ?? 35.0 ? v/v ? unity ? gain ? bandwidth ? ? f bw ? ? ? c(iout) ? = ? 10pf. ? measure ? at ? iout. ? note ? 1 ? 4.8 ? 6.8 ? 8.8 ? mhz ?
november ? 29, ? 2012 ??? | ? final ? datasheet 7 IR3553 40a ? integrated ? powirstage? ? parameter ? symbol ? conditions ? min ? typ ? max ? unit ? slew ? rate ?? s r ??? ? 6 ?? v/s ? differential ? input ? range ?? v d_in ? 0.8v ?? v(refin) ?? 2.25v, ?? \ 10 ?? 25 ? mv ? common ? mode ? input ? range ?? v c_in ? ? 0 ?? vcc \ 2.5 ? v ? output ? impedance ? (iout) ?? r cs_out ? ?? ? 62 ? 200 ?? iout ? sink ? current ?? i cs_sink ? driving ? external ? 3 ? k ? 0.5 ? 0.8 ? 1.1 ? ma ? diode ? emulation ? mode ? comparator ?? input ? offset ? voltage ?? v in_offset ? note ? 1 ??\ 12 ?\ 3 ?? 3 ? mv ? leading ? edge ? blanking ? time ?? t blank ? v(gatel)>1v ? starts ? timer ?? 50 ? 150 ? 200 ? ns ? negative ? current ? time \ out ?? t nc_tout ? pwm ? = ? tri \ state, ?? v(sw) ???\ 10mv ? 12 ? 28 ? 46 ? s ? digital ? input ? ? ? bbrk# ??? input ? voltage ? high ? ? v bbrk#_ih ? ?? 2.0 ? ? ? ? ? v ? input ? voltage ? low ? ? v bbrk#_il ? ?? ?? ?? 0.8 ? v ? internal ? pull ? up ? resistance ?? r bbrk#_pullup ? vcc ? > ? uvlo ? 69 ? 200 ?? 338 ? k ? internal ? pull ? up ? voltage ?? v bbrk#_pullup ? vcc ? > ? uvlo ?? 3.3 ?? v ? digital ? output ? ? ? phsflt# ? output ? voltage ? high ? v phasflt#_oh ?? ? ? vcc ? v ? output ? voltage ? low ? v phasflt#_ol ? 4ma ?? 150 ? 300 ? mv ? input ? current ? i phasflt#_in ? v(phsflt#) ? = ? 5.5v ?? 0 ? 1 ? a ? phase ? fault ? detection ? control ? mosfet ? short ? threshold ? v cm_short ? measure ? from ? sw ? to ? pgnd ?? 3.3 ?? v ? synchronous ? mosfet ? short ? threshold ? v sm_short ? measure ? from ? sw ? to ? pgnd ? 150 ? 200 ? 250 ? mv ? synchronous ? mosfet ? open ? threshold ? v sm_open ? measure ? from ? sw ? to ? pgnd ?\ 250 ?\ 200 ?\ 150 ? mv ? propagation ? delay ? t prop ? pwm ? high ? to ? low ? cycles ?? 15 ?? cycle ? thermal ? flag ? ? rising ? threshold ?? t rise ? phsflt# ? drives ? low, ?? note ? 1 ? ? 160 ?? c ? falling ? threshold ? t fall ? note ? 1 ?? 135 ?? c ? bootstrap ? diode ? ? forward ? voltage ?? v fwd ? i(boost) ? = ? 30ma, ? vcc ? = ? 6.8v ? ? ? 360 ? ? 520 ? ? 920 ? ? mv ? vcc ? under ? voltage ? lockout ? start ? threshold ?? v vcc_start ? ?? 3.3 ? 3.7 ? 4.1 ? v ? stop ? threshold ? ? v vcc_stop ? ? 3.0 ? 3.4 ? 3.8 ? v ? hysteresis ?? v vcc_hys ? ? 0.2 ? 0.3 ?? 0.4 ? v ? general ? ?
november ? 29, ? 2012 ??? | ? final ? datasheet 8 IR3553 40a ? integrated ? powirstage? ? parameter ? symbol ? conditions ? min ? typ ? max ? unit ? vcc ? supply ? current ? i vcc ? ? vcc ? = ? 4.5v ? to ? 7v ? 4 ? 8 ?? 12 ? ma ? vin ? supply ? leakage ? current ? i vin ? vin ? = ? 20v, ? 125c, ? v(pwm) ? = ? tri \ state ? ?? 1 ? a ? boost ? supply ? current ?? i boost ? ? 4.75v ? < ? v(boost) \ v(sw) ? < ? 8v ? 0.5 ?? 1.5 ?? 3.0 ? ma ? refin ? bias ? current ?? i refin ??? ?\ 1.5 ? 0 ?? 1 ? a ? sw ? floating ? voltage ?? v sw_float ? v(pwm) ? = ? tri \ state ?? 0.2 ? 0.4 ? v ? sw ? pull ? down ? resistance ?? r sw_pulldown ? bbrk# ? is ? low ? or ? vcc ? = ? 0v ?? 18 ?? k ? notes ?? 1. ?? guaranteed ? by ? design ? but ? not ? tested ? in ? production ? 2. ?? v in =12v, ? v out =1.2v, ? ? sw ? = ? 300khz, ? l=210nh ? (0.2m ), ? vcc=6.8v, ? c in =47uf ? x ? 4, ? c out ? =470uf ? x3, ? 400lfm ? airflow, ? no ? heat ? sink, ? 25c ? ambient ? temperature, ? and ? 8 \ layer ? pcb ? of ? 3.7? ? (l) ? x ? 2.6? ? (w). ? pwm ? controller ? loss ? and ? inductor ? loss ? are ? not ? included. ?? 3. ?? v in =12v, ? v out =1.2v, ? ? sw ? = ? 400khz, ? l=150nh ? (0.29m ), ? vcc=7v, ? c in =47uf ? x ? 4, ? c out ? =470uf ? x3, ? no ? airflow, ? no ? heat ? sink, ? 25c ? ambient ? temperature, ? and ? 8 \ layer ? pcb ? of ? 3.7? ? (l) ? x ? 2.6? ? (w). ? pwm ? controller ? loss ? and ? inductor ? loss ? are ? not ? included.
november ? 29, ? 2012 ??? | ? final ? datasheet 9 IR3553 40a ? integrated ? powirstage? ? typical ? operating ? characteristics ? circuit ? of ? figure ? 32, ? v in =12v, ? v out =1.2v, ? ? sw ? = ? 400khz, ? l=150nh ? (0.29m ), ? vcc=7v, ? t ambient ? = ? 25c, ? no ? heat ? sink, ? no ? air ? flow, ? 8 \ layer ? pcb ? board ? of ? 3.7? ? (l) ? x ? 2.6? ? (w), ? no ? pwm ? controller ? loss, ? no ? inductor ? loss, ? unless ? specified ? otherwise. ? figure ? 7: ? typical ? IR3553 ? efficiency ? figure ? 8: ? typical ? IR3553 ? power ? loss ? figure ? 9: ? safe ? operating ? area, ? t case ? <= ? 125c ? figure ? 10: ? normalized ? power ? loss ? vs. ? input ? voltage ? figure ? 11: ? normalized ? power ? loss ? vs. ? output ? voltage ? figure ? 12: ? normalized ? power ? loss ? vs. ? switching ? frequency ? 80 81 82 83 84 85 86 87 88 89 90 91 92 93 0 5 10 15 20 25 30 35 40 output ? current ? (a) efficiency ? (%) ? 0 1 2 3 4 5 6 7 8 9 10 0 5 10 15 20 25 30 35 40 output ? current ? (a) power ? loss ? (w) ? 0 5 10 15 20 25 30 35 40 45 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 ambient ? temperature ? (c) output ? current ? (a) 400lfm 200lfm 100lfm 0lfm 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 56789101112131415 input ? voltage ? (v) normalized ? power ? loss \ 6.0 \ 4.5 \ 3.0 \ 1.5 0.0 1.5 3.0 4.5 6.0 7.5 9.0 case ? temperature ? adjustment ? (c) 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 output ? voltage ? (v) normalized ? power ? loss \ 6 \ 3 0 3 6 9 12 15 case ? temperature ? adjustment ? (c) 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 200 300 400 500 600 700 800 900 1000 switching ? frequency ? (khz) normalized ? power ? loss ? \ 6.0 \ 4.5 \ 3.0 \ 1.5 0.0 1.5 3.0 4.5 6.0 7.5 9.0 case ? temperature ? adjustment ? (c)
november ? 29, ? 2012 ??? | ? final ? datasheet 10 IR3553 40a ? integrated ? powirstage? ? typical ? operating ? characteristics ? (continued) ? circuit ? of ? figure ? 32, ? v in =12v, ? v out =1.2v, ? ? sw ? = ? 400khz, ? l=150nh ? (0.29m ), ? vcc=7v, ? t ambient ? = ? 25c, ? no ? heat ? sink, ? no ? air ? flow, ? 8 \ layer ? pcb ? board ? of ? 3.7? ? (l) ? x ? 2.6? ? (w), ? no ? pwm ? controller ? loss, ? no ? inductor ? loss, ? unless ? specified ? otherwise. ? figure ? 13: ? normalized ? power ? loss ? vs. ? vcc ? voltage ? figure ? 14: ? power ? loss ? vs. ? output ? inductor ? figure ? 15: ? vcc ? current ? vs. ? switching ? frequency ? figure ? 16: ? switching ? waveform, ? i out ? = ? 0a ? figure ? 17: ? switching ? waveform, ? i out ? = ? 40a ? figure ? 18: ? pwm ? to ? sw ? delays, ? i out ? = ? 10a ? pwm ? 2 v/div sw ? 5v/div 40ns / div ? pwm ? 5v / div sw ? 5v / div gatel ? 10v / div 400ns / div ? pwm ? 5v/div sw ? 5v/div gatel ? 1 0v/div 400ns / div ? 0 10 20 30 40 50 60 200 300 400 500 600 700 800 900 1000 fsw ? (khz) vcc ? current ? (ma) ? vcc=6.8v vcc=5v 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 vcc ? voltage ? (v) normalized ? power ? loss ? \ 6.0 \ 4.5 \ 3.0 \ 1.5 0.0 1.5 3.0 4.5 6.0 7.5 9.0 case ? temperature ? adjustment ? (c) 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 120 130 140 150 160 170 180 190 200 210 output ? inductor ? (nh) normalized ? power ? loss \ 6.0 \ 4.5 \ 3.0 \ 1.5 0.0 1.5 3.0 4.5 6.0 7.5 9.0 case ? temperature ? adjustment ? (c)
november ? 29, ? 2012 ??? | ? final ? datasheet 11 IR3553 40a ? integrated ? powirstage? ? typical ? operating ? characteristics ? (continued) ? circuit ? of ? figure ? 32, ? v in =12v, ? v out =1.2v, ? ? sw ? = ? 400khz, ? l=150nh ? (0.29m ), ? vcc=7v, ? t ambient ? = ? 25c, ? no ? heat ? sink, ? no ? air ? flow, ? 8 \ layer ? pcb ? board ? of ? 3.7? ? (l) ? x ? 2.6? ? (w), ? no ? pwm ? controller ? loss, ? no ? inductor ? loss, ? unless ? specified ? otherwise. ? figure ? 19: ? body \ braking? ? delays ? figure ? 20: ? pwm ? tri \ state ? delays, ? i out ? = ? 10a ? figure ? 21: ? pwm ? tri \ state ? delays, ? i out ? = ? 10a ? figure ? 22: ? diode ? emulation ? mode, ? i out ? = ? 3a ? figure ? 23: ? body \ braking? ? mode, ? i out ? = ? 3a ? figure ? 24: ? diode ? emulation ? setup ? through ? bbrk# ? capacitor ? vcc ? 2 v/div bbrk# ? 1 v/div 2ms / div ? sw ? 1 0v/div bbrk# ? 5v / div gatel ? 5 v /d iv 40ns / div ? pwm ? 5 v /d iv pwm ? 2 v/div sw ? 5v/div 100ns / div ? pwm ? 2v/div sw ? 5v/div 100ns / div ? pwm ? 2 v/div sw ? 5v/div 400ns / div ? gatel ? 1 0v/div pwm ? 2 v/div sw ? 5v/div 400ns / div ? gaetl ? 1 0v/div
november ? 29, ? 2012 ??? | ? final ? datasheet 12 IR3553 40a ? integrated ? powirstage? ? typical ? operating ? characteristics ? (continued) ? circuit ? of ? figure ? 32, ? v in =12v, ? v out =1.2v, ? ? sw ? = ? 400khz, ? l=150nh ? (0.29m ), ? vcc=7v, ? t ambient ? = ? 25c, ? no ? heat ? sink, ? no ? air ? flow, ? 8 \ layer ? pcb ? board ? of ? 3.7? ? (l) ? x ? 2.6? ? (w), ? no ? pwm ? controller ? loss, ? no ? inductor ? loss, ? unless ? specified ? otherwise. ? figure ? 25: ? diode ? emulation ? setup ? through ? bbrk# ? input ? figure ? 26: ? diode ? emulation ? setup ? through ? bbrk# ? input ? figure ? 27: ? current ? sense ? amplifier ? output ? vs. ? current ? figure ? 28: ? current ? sense ? amplifier ? output, ? i out ? = ? 0a ? figure ? 29: ? current ? sense ? amplifier ? output, ? i out ? = ? 20a ? figure ? 30: ? current ? sense ? amplifier ? output, ? i out ? = ? 20a, ? 300khz 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0 5 10 15 20 25 30 35 40 output ? current ? (a) iout \ refin ? (v) vcc ? 2v /d iv bbrk# ? 2 v/div 4ms / div ? vcc ? 2v /d iv bbrk# ? 2 v/div 4ms / div ? v(iout) \ v(refin) ? 0.2v/div il ? 10a/div 2us/div ? sw ? 20v/div v(iout) \ v(refin) ? 0.2v/div il ? 10a/div 2us/div ? sw ? 20v/div v(iout) \ v(refin) ? 0.2v/div il ? 10a/div 2us/div ? sw ? 20v/div
november ? 29, ? 2012 ??? | ? final ? datasheet 13 IR3553 40a ? integrated ? powirstage? ? theory ? of ? operation ? description ? the ? IR3553 ? powirstage? ? is ? a ? synchronous ? buck ? driver ? with ? co \ packed ? mosfets ? with ? integrated ? schottky ? diode, ? which ? provides ? system ? designers ? with ? ease ? of ? use ? and ? flexibility ? required ? in ? cutting ? edge ? cpu, ? gpu ? and ? ddr ? memory ? power ? delivery ? designs ? and ? other ? high \ current ? low \ profile ? applications. ??? the ? IR3553 ? is ? designed ? to ? work ? with ? a ? pwm ? controller. ?? it ? incorporates ? a ? continuously ? self \ calibrated ? current ? sense ? amplifier, ? optimized ? for ? use ? with ? inductor ? dcr ? sensing. ?? the ? current ? sense ? amplifier ? provides ? signal ? gain ? and ? noise ? immunity, ? supplying ? multiphase ? systems ? with ? a ? superior ? design ? toolbox ? for ? programmed ? impedance ? designs. ?? the ? IR3553 ? provides ? a ? phase ? fault ? signal ? capable ?? of ? detecting ? open ? or ? shorted ? mosfets, ? or ? an ? over \ temperature ? condition ? in ? the ? vicinity ? of ? the ? power ? stage. ? the ? IR3553 ? accepts ? an ? active ? low ? body \ braking? ? input ? which ? disables ? both ? mosfets ? to ? enhance ? transient ? performance ? or ? provide ? a ? high ? impedance ? output. ? the ? IR3553 ? provides ? diode ? emulation ? feature ? which ? avoids ? negative ? current ? in ? the ? synchronous ? mosfet ? and ? improves ? light ? load ? efficiency. ? the ? IR3553 ? pwm ? input ? is ? compatible ? with ? 3.3v ? logic ? signal ? and ? 7v ? tolerant. ? it ? accepts ? 3 \ level ? pwm ? input ? signals ? with ? tri \ state. ? pwm ? tri \ state ? input ? the ? IR3553 ? pwm ? accepts ? 3 \ level ? input ? signals. ? when ?? pwm ? input ? is ? high, ? the ? synchronous ? mosfet ? is ? turned ? off ? and ? the ? control ? mosfet ? is ? turned ? on. ? when ? pwm ? input ? is ? low, ? control ? mosfet ? is ? turned ? off ? and ? synchronous ? mosfet ? is ? turned ? on. ? figures ? 16 \ 18 ? show ? the ? pwm ? input ? and ? the ? corresponding ? sw ? and ? gatel ? output ? of ? the ? IR3553. ? if ? pwm ? pin ? is ? floated ? , ? the ? built \ in ? resistors ? pull ? the ? pwm ? pin ? into ? a ? tri \ state ? region ? centered ? around ? 1.65v. ?? when ? pwm ? input ? is ? in ? tri \ state, ? two ? operation ? modes ? can ? be ? selected ? by ? controlling ? bbrk# ? input. ? if ? the ? bbrk# ? input ? is ? always ? high, ? the ? default ? operation ? mode ? is ? body \? braking?, ? in ? which ? both ? mosfets ? will ? be ? turned ? off ? when ? the ? pwm ? input ? is ? in ? tri \ state. ? if ? the ? bbrk# ? input ? has ? been ? pulled ? low ? for ? at ? least ? 20ns ? after ? the ? vcc ? passes ? its ? uvlo ? threshold ? during ? power ? up, ? the ? diode ? emulation ? mode ? is ? set. ? pwm ? input ? in ? tri \ state ? will ? activate ? a ? synchronous ? diode ? emulation ? feature ? allowing ? designers ? to ? maximize ? system ? efficiency ? at ? light ? loads ? without ? compromising ? transient ? performance. ? body \ braking? ? mode ?? international ? rectifier?s ? body \ braking? ? is ? a ? operation ? mode ? in ? which ? two ? mosfets ? are ? turned ? off. ? when ? the ? synchronous ? mosfet ? is ? off, ? the ? higher ? voltage ? across ? the ? shottky ? diode ? in ? parallel ? helps ? discharging ? the ? inductor ? current ? faster, ? which ? reduces ? the ? output ? voltage ? overshoot. ? the ? body \ braking? ? can ? be ? used ? either ? to ? enhance ? transient ? response ? of ? the ? converter ? after ? load ? release ? or ? to ? provide ? a ? high ? impedance ? output. ?? there ? are ? two ? ways ? to ? place ? the ? IR3553 ? in ? body \ braking? ? mode, ? either ? controlling ? the ? bbrk# ? pin ? directly ? or ? through ? a ? pwm ? tri \ state ? signal. ? both ? control ? signals ? are ? usually ? from ? the ? pwm ? controller. ? pulling ? bbrk# ? low ? forces ? the ? IR3553 ? into ? body \ braking? ? mode ? rapidly, ? which ? is ? usually ? used ? to ? enhance ? converter ? transient ? response ? after ? load ? release, ? as ? shown ? in ? figure ? 19. ? releasing ? bbrk# ? forces ? the ? IR3553 ? out ? of ? body \? braking? ? mode ? quickly. ?? the ? bbrk# ? low ? turns ? off ? both ? mosfets ? and ? therefore ? can ? also ? be ? used ? to ? disable/enable ? a ? converter. ? if ? the ? bbrk# ? input ? is ? always ? high, ? the ? body \ braking? ? is ? activated ? when ? the ? pwm ? input ? enters ? the ? tri \ state ? region, ? as ? shown ? in ? figures ? 20 ? and ? 21. ? comparing ? to ? pulling ? down ? the ? bbrk# ? pin ? directly, ? the ? body \ braking? ? response ? to ? pwm ? tri \ state ? signal ? is ? slower ? due ? to ? the ? hold \ off ? time ? created ? by ? the ? pwm ? pin ? parasitic ? capacitor ? with ? the ? pull \ up ? and ? pull \ down ? resistors ? of ? pwm ? pin. ? for ? better ? performance, ? no ? more ? than ? 100pf ? parasitic ? capacitive ? load ? should ? be ? present ? on ? the ? pwm ? line ? of ? IR3553. ?? synchronous ? diode ? emulation ? mode ? an ? additional ? feature ? of ? the ? IR3553 ? is ? the ? synchronous ? diode ? emulation ? mode. ? this ? function ? enables ? increased ? efficiency ? by ? preventing ? negative ? inductor ? current ? from ? flowing ? in ? the ? synchronous ? mosfet. ?? as ? shown ? in ? figure ? 22, ? when ? the ? pwm ? input ? enters ? the ? tri \ state ? region ? the ? control ? mosfet ? is ? turned ? off ? first, ? and ? the ? synchronous ? mosfet ? is ? initially ? turned ? on ? and ? then ? is ? turned ? off ? when ? the ? output ? current ? reaches ? zero. ? if ? the ? sensed ? output ? current ? does ? not ? reach ? zero ? within ? a ? set ? amount ? of ? time ? the ? gate ? driver ? will ? assume ? that ? the ? output ?
november ? 29, ? 2012 ??? | ? final ? datasheet 14 IR3553 40a ? integrated ? powirstage? ? is ? de \ biased ? and ? turn ? off ? the ? synchronous ? mosfet, ? allowing ? the ? switch ? node ? to ? float. ?? this ? is ? in ? contrast ? to ? the ? body \ braking? ? mode ? shown ? in ? figure ? 23, ? where ? gatel ? follows ? pwm ? input. ? the ? schottky ? diode ? in ? parallel ? with ? the ? synchronous ? mosfet ? conducts ? for ? a ? longer ? period ? of ? time ? and ? therefore ? lowers ? the ? light ? load ? efficiency. ? the ? zero ? current ? detection ? circuit ? in ? the ? it3553 ? is ? independent ? of ? the ? current ? sense ? amplifier ? and ? therefore ? still ? functions ? even ? if ? the ? current ? sense ? amplifier ? is ? not ? used. ?? as ? shown ? in ? figure ? 6, ? an ? offset ? is ? added ? to ? the ? diode ? emulation ? comparator ? so ? that ? a ? slightly ? positive ? output ? current ? in ? the ? inductor ? and ? synchronous ? mosfet ? is ? treated ? as ? zero ? current ? to ? accommodate ? propagation ? delays, ? preventing ? any ? negative ? current ? flowing ? in ? the ? synchronous ? mosfet. ? this ? causes ? the ? schottky ? diode ? in ? parallel ? with ? the ? synchronous ? mosfet ? to ? conduct ? before ? the ? inductor ? current ? actually ? reaches ? zero, ? and ? the ? conduction ? time ? increases ? with ? inductance ? of ? the ? output ? inductor. ? to ? set ? the ? IR3553 ? in ? diode ? emulation ? mode, ? the ? bbrk# ? pin ? must ? be ? toggled ? low ? at ? least ? once ? after ? the ? vcc ? passes ? its ? uvlo ? threshold ? during ? power ? up. ? one ? simple ? way ? is ? to ? use ? the ? internal ? bbrk# ? pull \ up ? resistor ? (200k ? typical) ? with ? an ? external ? capacitor ? from ? bbrk# ? pin ? to ? lgnd, ? as ? shown ? in ? figure ? 4. ? to ? ensure ? the ? diode ? emulation ? mode ? is ? properly ? set, ? the ? bbrk# ? voltage ? should ? be ? lower ? than ? 0.8v ? when ? the ? vcc ? voltage ? passes ? its ? uvlo ? threshold ? (3.3v ? minimum ? and ? 3.7v ? typical), ? as ? shown ? in ? figure ? 24. ? a ? digital ? signal ? from ? the ? pwm ? controller ? can ? also ? be ? used ? to ? set ? the ? diode ? emulation ? mode. ? the ? bbrk# ? signal ? can ? either ? be ? pulled ? low ? for ? at ? least ? 20ns ? after ? the ? vcc ? passes ? its ? uvlo ? threshold, ? as ? shown ? in ? figure ? 25, ? or ? be ? pulled ? low ? before ? vcc ? power ? up ? and ? then ? released ? after ? the ? vcc ? passes ? its ? uvlo ? threshold, ? as ? shown ? in ? figure ? 26. ?? once ? the ? diode ? emulation ? mode ? is ? set, ? it ? cannot ? be ? reset ? until ? the ? vcc ? power ? is ? recycled. ? phase ? fault ? and ? thermal ? flag ? output ? the ? phase ? fault ? circuit ? looks ? at ? the ? switch ? node ? with ? respect ? to ? ground ? to ? determine ? whether ? there ? is ? a ? defective ? mosfet ? in ? the ? phase. ? the ? output ? of ? the ? phase ? fault ? signal ? is ? high ? during ? normal ? operation ? and ? is ? pulled ? low ? when ? there ? is ? a ? fault. ? each ? driver ? monitors ? the ? mosfet ? it ? drives. ? if ? the ? switch ? node ? is ? less ? than ? a ? certain ? voltage ? above ? ground ? when ? the ? pwm ? signal ? goes ? low ? or ?? if ? the ? switch ? node ? is ? a ? certain ? voltage ? above ? ground ? when ? the ? pwm ? signal ? rises, ? this ? gives ? a ? fault ? signal. ? if ? there ? are ? a ? number ? of ? consecutive ? faults ? the ? phase ? fault ? signal ? is ? asserted. ? thermal ? flag ? circuit ? monitors ? the ? temperature ? of ? the ? IR3553. ? if ? the ? temperature ? goes ? above ? a ? threshold ? (160c ? typical) ? the ? phsflt# ? pin ? is ? pulled ? low ? after ? a ? maximum ? delay ? of ? 100us. ? the ? phsflt# ? pin ? can ? be ? pulled ? low ? by ? either ? the ? phase ? fault ? circuit ? or ? the ? thermal ? flag ? circuit. ? the ? phase ? fault ? signal ? could ? be ? used ? to ? turn ? off ? the ? ac/dc ? converter ? or ? blow ? a ? fuse ? to ? disconnect ? the ? dc/dc ? converter ? input ? from ? the ? supply. ? if ? phsflt# ? is ? not ? used ? it ? can ? be ? floated ? or ? connected ? to ? lgnd. ? lossless ? average ? inductor ? current ? sensing ? inductor ? current ? can ? be ? sensed ? by ? connecting ? a ? series ? resistor ? and ? a ? capacitor ? network ? in ? parallel ? with ? the ? inductor ? and ? measuring ? the ? voltage ? across ? the ? capacitor, ? as ? shown ? in ? figure ? 31. ?? sw vin csin+ csin \ IR3553 v in v out cin c cs l cout r cs r l \ + i l + ? v cs ?\ current ? sense ? amplifier + ??????? v l ???????\ ? figure ? 31: ? inductor ? current ? sensing ? the ? equation ? of ? the ? current ? sensing ? network ? is ? as ? follows. ? cs cs l l l cs cs l cs c sr r l s r s i c sr s v s v ? ? ? ? ? 1 1 ) ( 1 1 ) ( ) ( ? ? l l r s i ) ( ? cs cs l c r r l when ? ? ? usually ? the ? resistor ? r cs ? and ? capacitor ? c cs ? are ? chosen ? so ? that ? the ? time ? constant ? of ? r cs ? and ? c cs ? equals ? the ? inductor ? time ?
november ? 29, ? 2012 ??? | ? final ? datasheet 15 IR3553 40a ? integrated ? powirstage? ? constant, ? which ? is ? the ? inductance ? l ? over ? the ? inductor ? dcr ? (r l ). ? if ? the ? two ? time ? constants ? match, ? the ? voltage ? across ? c cs ? is ? proportional ? to ? the ? current ? through ? l, ? and ? the ? sense ? circuit ? can ? be ? treated ? as ? if ? only ? a ? sense ? resistor ? with ? the ? value ? of ? r l ? was ? used. ? the ? mismatch ? of ? the ? time ? constants ? does ? not ? affect ? the ? measurement ? of ? inductor ? dc ? current, ? but ? affects ? the ? ac ? component ? of ? the ? inductor ? current. ? the ? advantage ? of ? sensing ? the ? inductor ? current ? versus ? high ? side ? or ? low ? side ? sensing ? is ? that ? actual ? output ? current ? being ? delivered ? to ? the ? load ? is ? obtained ? rather ? than ? peak ? or ? sampled ? information ? about ? the ? switch ? currents. ? the ? output ? voltage ? can ? be ? positioned ? to ? meet ? a ? load ? line ? based ? on ? real ? time ? information. ? this ? is ? the ? only ? sense ? method ? that ? can ? support ? a ? single ? cycle ? transient ? response. ? other ? methods ? provide ? no ? information ? during ? either ? load ? increase ? (low ? side ? sensing) ? or ? load ? decrease ? (high ? side ? sensing). ?? current ? sense ? amplifier ? a ? high ? speed ? differential ? current ? sense ? amplifier ? is ? located ? in ? the ? IR3553, ? as ? shown ? in ? figure ? 6. ? its ? gain ? is ? nominally ? 32.5, ? and ? the ? inductor ? dcr ? increase ? with ? temperature ? is ? not ? compensated ? inside ? the ? IR3553. ? the ? current ? sense ? amplifier ? output ? iout ? is ? referenced ? to ? refin, ? which ? is ? usually ? connected ? to ? a ? reference ? voltage ? from ? the ? pwm ? controller. ? figure ? 27 ? shows ? the ? differential ? voltage ? of ? v(iout) ? ? ? v(refin) ? versus ? the ? inductor ? current ? and ? reflects ? the ? inductor ? dcr ? increase ? with ? temperature ? at ? higher ? current. ? the ? current ? sense ? amplifier ? can ? accept ? positive ? differential ? input ? up ? to ? 25mv ? and ? negative ? input ? up ? to ?\ 10mv ? before ? clipping. ? the ? output ? of ? the ? current ? sense ? amplifier ? is ? summed ? with ? the ? reference ? voltage ? refin ? and ? sent ? to ? the ? iout ? pin. ? the ? refin ? voltage ? is ? to ? ensure ? at ? light ? loads ? there ? is ? enough ? output ? range ? to ? accommodate ? the ? negative ? current ? ripple ? shown ? in ? figure ? 28. ? in ? a ? multiphase ? converter, ? the ? iout ? pins ? of ? all ? the ? phases ? can ? be ? tied ? together ? through ? resistors, ? and ? the ? iout ? voltage ? represents ? the ? average ? current ? through ? all ? the ? inductors ? and ? is ? used ? by ? the ? controller ? for ? adaptive ? voltage ? positioning. ?? the ? input ? offset ? voltage ? is ? the ? primary ? source ? of ? error ? for ? the ? current ? signal. ? in ? order ? to ? obtain ? very ? accurate ? current ? signal, ? the ? current ? sense ? amplifier ? continuously ? calibrates ? itself, ? and ? the ? input ? offset ? of ? this ? amplifier ? is ? within ? +/ \? 450uv. ? this ? calibration ? algorithm ? can ? create ? a ? small ? ripple ? on ? iout ? with ? a ? frequency ? of ? fsw/128. ?? if ? the ? IR3553 ? current ? sense ? amplifier ? is ? required, ? connect ? its ? output ? iout ? and ? the ? reference ? voltage ? refin ? to ? the ? pwm ? controller ? and ? connect ? the ? inductor ? sense ? circuit ? as ? shown ? in ? figure ? 4. ? if ? the ? current ? sense ? amplifier ? is ? not ? needed, ? tie ? csin+, ? csin \? and ? refin ? pins ? to ? lgnd ? and ? float ? iout ? pin, ? as ? shown ? in ? figure ? 5. ? ? design ? procedures ? ? power ? loss ? calculation ? the ? single \ phase ? IR3553 ? efficiency ? and ? power ? loss ? measurement ? circuit ? is ? shown ? in ? figure ? 32. ?? sw vin pgnd vcc boost pwm csin+ csin \ lgnd iout bbrk# refin IR3553 phsflt# v in v out c2 47uf ? x4 c5 0.22uf c4 0.22uf r2 2.49k l1 150nh c6 470uf ? x3 c1 0.1uf ? x2 vcc r1 10k i vcc i in i out c3 1uf c7 1nf v sw ? figure ? 32: ? IR3553 ? power ? loss ? measurement ? the ? IR3553 ? power ? loss ? is ? determined ? by, ?? out sw vcc cc in in loss i v i v i v p ? ? ? ? ? ? ? where ? both ? mosfet ? loss ? and ? the ? driver ? loss ? are ? included, ? but ? the ? pwm ? controller ? and ? the ? inductor ? losses ? are ? not. ? figure ? 7 ? shows ? the ? measured ? single \ phase ? IR3553 ? efficiency ? under ? the ? default ? test ? conditions, ? v in =12v, ? v out =1.2v, ? ? sw ? = ? 400khz, ? l=150nh ? (0.29m ), ? vcc=7v, ? t ambient ? = ? 25c, ? no ? heat ? sink, ? and ? no ? air ? flow. ?? the ? efficiency ? of ? an ? interleaved ? multiphase ? IR3553 ? converter ? is ? always ? higher ? than ? that ? of ? a ? single \ phase ? under ? the ? same ? conditions ? due ? to ? the ? reduced ? input ? rms ? current ? and ? more ? input/output ? capacitors. ? the ? measured ? single \ phase ? IR3553 ? power ? loss ? under ? the ? same ? conditions ? is ? provided ? in ? figure ? 8. ??
november ? 29, ? 2012 ??? | ? final ? datasheet 16 IR3553 40a ? integrated ? powirstage? ? if ? any ? of ? the ? application ? condition, ? i.e. ? input ? voltage, ? output ? voltage, ? switching ? frequency, ? vcc ? mosfet ? driver ? voltage ? or ? inductance, ? is ? different ? from ? those ? of ? figure ? 8, ? a ? set ? of ? normalized ? power ? loss ? curves ? should ? be ? used. ? obtain ? the ? normalizing ? factors ? from ? figure ? 10 ? to ? figure ? 14 ? for ? the ? new ? application ? conditions; ? multiply ? these ? factors ? by ? the ? power ? loss ? obtained ? from ? figure ? 8 ? for ? the ? required ? load ? current. ? as ? an ? example, ? the ? power ? loss ? calculation ? procedures ? under ? different ? conditions, ? v in =10v, ? v out =1v, ? ? sw ? = ? 300khz, ? vcc=5v, ? l=210nh, ? vcc=5v, ? i out =30a, ? t ambient ? = ? 25c, ? no ? heat ? sink, ? and ? no ? air ? flow, ? are ? as ? follows. ? 1) determine ? the ? power ? loss ? at ? 30a ? under ? the ? default ? test ? conditions ? of ? v in =12v, ? v out =1.2v, ? ? sw ? = ? 400khz, ? l=150nh, ? vcc=7v, ? t ambient ? = ? 25c, ? no ? heat ? sink, ? and ? no ? air ? flow. ? it ? is ? 4.7w ? from ? figure ? 8. ? 2) determine ? the ? input ? voltage ? normalizing ? factor ? with ? v in =10v, ? which ? is ? 1.02 ? based ? on ? the ? dashed ? lines ? in ? figure ? 10. ? 3) determine ? the ? output ? voltage ? normalizing ? factor ? with ? v out =1v, ? which ? is ? 0.90 ? based ? on ? the ? dashed ? lines ? in ? figure ? 11. ? 4) determine ? the ? switching ? frequency ? normalizing ? factor ? with ? ? sw ? = ? 300khz, ? which ? is ? 0.99 ? based ? on ? the ? dashed ? lines ? in ? figure ? 12. ? 5) determine ? the ? vcc ? mosfet ? drive ? voltage ? normalizing ? factor ? with ? vcc=5v, ? which ? is ? 1.18 ? based ? on ? the ? dashed ? lines ? in ? figure ? 13. ? 6) determine ? the ? inductance ? normalizing ? factor ? with ? l=210nh, ? which ? is ? 0.94 ? based ? on ? the ? dashed ? lines ? in ? figure ? 14. ?? 7) multiply ? the ? power ? loss ? under ? the ? default ? conditions ? by ? the ? five ? normalizing ? factors ? to ? obtain ? the ? power ? loss ? under ? the ? new ? conditions, ? which ? is ? 4.7w ? x ? 1.02 ? x ? 0.90 ? x ? 0.99 ? x ? 1.18 ? x ? 0.94 ? = ? 4.74w. ? safe ? operating ? area ? figure ? 9 ? shows ? the ? IR3553 ? safe ? operating ? area ? with ? the ? case ? temperature ? controlled ? at ? or ? below ? 125c. ? the ? test ? conditions ? are ? v in =12v, ? v out =1.2v, ? ? sw =400khz, ? l=150nh ? (0.29m ), ? vcc=7v, ? t ambient ? = ? 0c ? to ? 90c, ? no ? heat ? sink, ? and ? airflow ? = ? 0lfm ? / ? 100lfm ? / ? 200lfm ? / ? 400lfm. ? if ? any ? of ? the ? application ? condition, ? i.e. ? input ? voltage, ? output ? voltage, ? switching ? frequency, ? vcc ? mosfet ? driver ? voltage, ? or ? inductance ? is ? different ? from ? those ? of ? figure ? 9, ? a ? set ? of ? IR3553 ? case ? temperature ? adjustment ? curves ? should ? be ? used. ? obtain ? the ? temperature ? deltas ? from ? figure ? 10 ? to ? figure ? 14 ? for ? the ? new ? application ? conditions; ? sum ? these ? deltas ? and ? then ? subtract ? from ? the ? IR3553 ? case ? temperature ? obtained ? from ? figure ? 9 ? for ? the ? required ? load ? current. ? 8) from ? figure ? 9, ? determine ? the ? highest ? ambient ? temperature ? at ? the ? required ? load ? current ? under ? the ? default ? conditions, ? which ? is ? 66c ? at ? 30a ? with ? 0lfm ? airflow ? and ? the ? IR3553 ? case ? temperature ? of ? 125c. ?? 9) determine ? the ? case ? temperature ? with ? v in =10v, ? which ? is ? +0.6 ? based ? on ? the ? dashed ? lines ? in ? figure ? 10. ? 10) determine ? the ? case ? temperature ? with ? v out =1v, ? which ? is ?\ 3.0 ? based ? on ? the ? dashed ? lines ? in ? figure ? 11. ? 11) determine ? the ? case ? temperature ? with ? ? sw ? = ? 300khz, ? which ? is ?\ 0.4 ? based ? on ? the ? dashed ? lines ? in ? figure ? 12. ? 12) determine ? the ? case ? temperature ? with ? vcc ? = ? 5v, ? which ? is ? +5.4 ? based ? on ? the ? dashed ? lines ? in ? figure ? 13. ? 13) determine ? the ? case ? temperature ? with ? l=210nh, ? which ? is ?\ 1.8 ? based ? on ? the ? dashed ? lines ? in ? figure ? 14. ?? 14) sum ? the ? case ? temperature ? adjustment ? from ? 9) ? to ? 13), ???? +0.6 ?\ 3.0 ?\ 0.4 ? +5.4 ?\ 1.8 ? = ? +0.8. ? deduct ? the ? delta ? from ? the ? highest ? ambient ? temperature ? in ? step ? 8), ? 66c ? ? ? (+0.8c) ? = ? 65.2c. ? inductor ? current ? sensing ? capacitor ? c cs ? and ? resistor ? r cs ? if ? the ? IR3553 ? is ? used ? with ? inductor ? dcr ? sensing, ? care ? must ? be ? taken ? in ? the ? printed ? circuit ? board ? layout ? to ? make ? a ? kelvin ? connection ? across ? the ? inductor ? dcr. ? the ? dc ? resistance ? of ? the ? inductor ? is ? utilized ? to ? sense ? the ? inductor ? current. ? usually ? the ? resistor ? r cs ? and ? capacitor ? c cs ? in ? parallel ? with ? the ? inductor ? are ? chosen ? to ? match ? the ? time ? constant ? of ? the ? inductor, ? and ? therefore ? the ? voltage ? across ? the ? capacitor ? c cs ? represents ? the ? inductor ? current. ?? measure ? the ? inductance ? l ? and ? the ? inductor ? dc ? resistance ? r l . ? pre \ select ? the ? capacitor ? c cs ? and ? calculate ? r cs ? as ? follows. ? cs l cs c r l r ?
november ? 29, ? 2012 ??? | ? final ? datasheet 17 IR3553 40a ? integrated ? powirstage? ? input ? capacitors ? c vin ? at ? least ? two ? 10uf ? 1206 ? ceramic ? capacitors ? and ? one ? 0.1uf ? 0402 ? ceramic ? capacitor ? are ? recommended ? for ? decoupling ? the ? vin ? to ? pgnd ? connection. ? the ? 0.1uf ? 0402 ? capacitor ? should ? be ? on ? the ? same ? side ? of ? the ? pcb ? as ? the ? IR3553 ? and ? next ? to ? the ? vin ? and ? pgnd ? pins. ? adding ? additional ? capacitance ? and ? use ? of ? capacitors ? with ? lower ? esr ? and ? mounted ? with ? low ? inductance ? routing ? will ? improve ? efficiency ? and ? reduce ? overall ? system ? noise, ? especially ? in ? single \ phase ? designs ? or ? during ? high ? current ? operation. ? bootstrap ? capacitor ? c boost ? a ? minimum ? of ? 0.22uf ? 0402 ? capacitor ? is ? required ? for ? the ? bootstrap ? circuit. ? a ? high ? temperature ? 0.22uf ? or ? greater ? value ? 0402 ? capacitor ? is ? recommended. ? it ? should ? be ? mounted ? on ? the ? same ? side ? of ? the ? pcb ? as ? the ? IR3553 ? and ? as ? close ? as ? possible ? to ? the ? boost ? pin. ?? a ? low ? inductance ? routing ? of ? the ? sw ? pin ? connection ? to ? the ? other ? terminal ? of ? the ? bootstrap ? capacitor ? is ? strongly ? recommended. ? vcc ? decoupling ? capacitor ? c vcc ? a ? 0.1uf ? to ? 1uf ? ceramic ? decoupling ? capacitor ? is ? required ? at ? the ? vcc ? pin. ? it ? should ? be ? mounted ? on ? the ? same ? side ? of ? the ? pcb ? as ? the ? IR3553 ? and ? as ? close ? as ? possible ? to ? the ? vcc ? and ? pgnd ? (pin ? 4). ? low ? inductance ? routing ? between ? the ? vcc ? capacitor ? and ? the ? IR3553 ? pins ? is ? strongly ? recommended. ? body \ braking? ? feature ? the ? bbrk# ? pin ? should ? be ? pulled ? up ? to ? vcc ? if ? the ? feature ? is ? not ? used ? by ? the ? pwm ? controller. ? use ? of ? a ? small ? value ? resistor ? or ? a ? direct ? connection ? to ? vcc ? is ? recommended. ? mounting ? of ? heat ? sinks ? care ? should ? be ? taken ? in ? the ? mounting ? of ? heat ? sinks ? so ? as ? not ? to ? short \ circuit ? nearby ? components. ?? the ? vcc ? and ? bootstrap ? capacitors ? are ? typically ? mounted ? on ? the ? same ? side ? of ? the ? pcb ? as ? the ? IR3553. ? the ? mounting ? height ? of ? these ? capacitors ? must ? be ? considered ? when ? selecting ? their ? package ? sizes. ? high ? output ? voltage ? design ? considerations ? the ? IR3553 ? is ? capable ? of ? creating ? output ? voltages ? above ? the ? 3.3v ? recommended ? maximum ? output ? voltage ? as ? there ? are ? no ? restrictions ? inside ? the ? IR3553 ? on ? the ? duty ? cycle ? applied ? to ? the ? pwm ? pin. ? however ? if ? the ? current ? sense ? feature ? is ? required, ? the ? common ? mode ? range ? of ? the ? current ? sense ? amplifier ? inputs ? must ? be ? considered. ? a ? violation ? of ? the ? current ? sense ? input ? common ? mode ? range ? may ? cause ? unexpected ? IR3553 ? behavior. ? also ? the ? output ? current ? rating ? of ? the ? device ? will ? be ? reduced ? as ? the ? duty ? cycle ? increases. ? in ? very ? high ? duty ? cycle ? applications ? sufficient ? time ? must ? be ? provided ? for ? replenishment ? of ? the ? bootstrap ? capacitor ? for ? the ? control ? mosfet ? drive. ? layout ? example ? contact ? international ? rectifier ? for ? a ? layout ? example ? suitable ? for ? your ? specific ? application. ?
november ? 29, ? 2012 ??? | ? final ? datasheet 18 IR3553 40a ? integrated ? powirstage? ? metal ? and ? component ? placement ? ? lead ? land ? width ? should ? be ? equal ? to ? nominal ? part ? lead ? width. ? the ? minimum ? lead ? to ? lead ? spacing ? should ? be ?? 0.2mm ? to ? prevent ? shorting. ?? ? lead ? land ? length ? should ? be ? equal ? to ? maximum ? part ? lead ? length ? +0.15 ?\? 0.3 ? mm ? outboard ? extension ? and ? 0 ? to ? + ? 0.05mm ? inboard ? extension. ? the ? outboard ? extension ? ensures ? a ? large ? and ? visible ? toe ? fillet, ? and ? the ? inboard ? extension ? will ? accommodate ? any ? part ? misalignment ? and ?? ensure ? a ? fillet. ? ? center ? pad ? land ? length ? and ? width ? should ? be ? equal ? to ? maximum ? part ? pad ? length ? and ? width. ? ? only ? 0.30mm ? diameter ? via ? shall ? be ? placed ? in ? the ? area ? of ? the ? power ? pad ? lands ? and ? connected ? to ? power ? planes ? to ? minimize ? the ? noise ? effect ? on ? the ? ic ? and ? to ? improve ? thermal ? performance. ? 23 16 17 18 19 20 21 22 25 24 5 4 3 2 1 11 10 9 8 15 14 13 12 7 6 ? ? figure ? 33: ? metal ? and ? component ? placement ? * ? contact ? international ? rectifier ? to ? receive ? an ? electronic ? pcb ? library ? file ? in ? cadence ? allegro ? or ? cad ? dxf/dwg ? format.
november ? 29, ? 2012 ??? | ? final ? datasheet 19 IR3553 40a ? integrated ? powirstage? ? solder ? resist ? ? the ? solder ? resist ? should ? be ? pulled ? away ? from ?? the ? metal ? lead ? lands ? by ? a ? minimum ? of ? 0.06mm. ? the ? solder ? resist ? miss \ alignment ? is ? a ? maximum ?? of ? 0.05mm ? and ? it ? is ? recommended ? that ? the ? low ? power ? signal ? lead ? lands ? are ? all ? non ? solder ? mask ? defined ? (nsmd). ? therefore ? pulling ? the ? s/r ? 0.06mm ? will ? always ? ensure ? nsmd ? pads. ?? ? the ? minimum ? solder ? resist ? width ? is ? 0.13mm ? typical. ? ? at ? the ? inside ? corner ? of ? the ? solder ? resist ? where ?? the ? lead ? land ? groups ? meet, ? it ? is ? recommended ?? to ? provide ? a ? fillet ? so ? a ? solder ? resist ? width ? of ?? 0.17mm ? remains. ? ? the ? dimensions ? of ? power ? land ? pads, ? vin, ? pgnd, ? tgnd ? and ? sw, ? are ? non ? solder ? mask ? defined ? (nsmd). ? the ? equivalent ? pcb ? layout ? becomes ? solder ? mask ? defined ? (smd) ? after ? power ? shape ? routing. ? ? ensure ? that ? the ? solder ? resist ? in \ between ? the ? lead ? lands ? and ? the ? pad ? land ? is ?? 0.15mm ? due ? to ? the ? high ? aspect ? ratio ? of ? the ? solder ? resist ? strip ? separating ? the ? lead ? lands ? from ? the ? pad ? land. ? ? ? ? figure ? 34: ? solder ? resist ? ? * ? contact ? international ? rectifier ? to ? receive ? an ? electronic ? pcb ? library ? file ? in ? cadence ? allegro ? or ? cad ? dxf/dwg ? format.
november ? 29, ? 2012 ??? | ? final ? datasheet 20 IR3553 40a ? integrated ? powirstage? ? stencil ? design ? ? the ? stencil ? apertures ? for ? the ? lead ? lands ? should ? be ? approximately ? 65% ? to ? 75% ? of ? the ? area ? of ? the ? lead ? lands ? depending ? on ? stencil ? thickness. ? reducing ? the ? amount ? of ? solder ? deposited ? will ? minimize ? the ? occurrence ? of ? lead ? shorts. ? since ? for ? 0.5mm ? pitch ? devices ? the ? leads ? are ? only ? 0.25mm ? wide, ? the ? stencil ? apertures ? should ? not ? be ? made ? narrower; ? openings ? in ? stencils ? < ? 0.25mm ? wide ? are ? difficult ? to ? maintain ? repeatable ? solder ? release. ? ? the ? low ? power ? signal ? stencil ? lead ? land ? apertures ? should ? therefore ? be ? shortened ? in ? length ? to ? keep ? area ? ratio ? of ? 65% ? to ? 75% ? while ? centered ? on ? lead ? land. ? ? the ? power ? pads ? vin, ? pgnd, ? tgnd ? and ? sw, ? land ? pad ? apertures ? should ? be ? approximately ? 65% ? to ? 75% ? area ? of ? solder ? on ? the ? center ? pad. ? if ? too ? much ? solder ? is ? deposited ? on ? the ? center ? pad ? the ? part ? will ? float ? and ? the ? lead ? lands ? will ? be ? open. ? solder ? paste ? on ? large ? pads ? is ? broken ? down ? into ? small ? sections ? with ? a ? minimum ? gap ? of ? 0.2mm ? between ? allowing ? for ? out \ gassing ? during ? solder ? reflow. ? ? the ? maximum ? length ? and ? width ? of ? the ? land ? pad ? stencil ? aperture ? should ? be ? equal ? to ? the ? solder ? resist ? opening ? minus ? an ? annular ? 0.2mm ? pull ? back ? to ? decrease ? the ? incidence ? of ? shorting ? the ? center ? land ? to ? the ? lead ? lands ? when ? the ? part ? is ? pushed ? into ? the ? solder ? paste. ? figure ? 35: ? stencil ? design ? ? * ? contact ? international ? rectifier ? to ? receive ? an ? electronic ? pcb ? library ? file ? in ? cadence ? allegro ? or ? cad ? dxf/dwg ? format.
november ? 29, ? 2012 ??? | ? final ? datasheet 21 IR3553 40a ? integrated ? powirstage? ? marking ? information ? ? ? ? ? ? ? figure ? 36: ? pqfn ? 4mm ? x ? 6mm ? package ? information ? ? ? figure ? 37: ? pqfn ? 4mm ? x ? 6mm ? 3553m ? yww ? xxxxx site / date/ marking ? code lot ? code
november ? 29, ? 2012 ??? | ? final ? datasheet 22 IR3553 40a ? integrated ? powirstage? ? ? data ? and ? specifications ? subject ? to ? change ? without ? notice. ? this ? product ? will ? be ? designed ? and ? qualified ? for ? the ? industrial ? market. ? qualification ? standards ? can ? be ? found ? on ? ir?s ? web ? site. ? ir ? world ? headquarters: ? 233 ? kansas ? st., ? el ? segundo, ? california ? 90245, ? usa ? tel: ? (310) ? 252 \ 7105 ? tac ? fax: ? (310) ? 252 \ 7903 ? visit ? us ? at ? www.irf.com ? for ? sales ? contact ? information . ? www.irf.com ? ?

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