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mic2810 digital power management ic 2mhz, 600ma dc/dc w/dual 300ma/300ma low v in ldos lowq is a registered trademark of micrel, inc. mlf and micro leadframe are registered trademarks of amkor technology, inc. micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 ( 408 ) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com february 2008 m9999-022008-c general description the mic2810 is a high performance power management ic, integrating a 2mhz dc/dc switcher with two 300ma ldos. the mic2810 features a lowq ? mode, reducing the total current draw while in this mode to less than 30a. in lowq ? mode, the output noise of the dc/dc converter is 53v rms , significantly lower than other converters that use a pfm light load mode that can interfere with sensitive rf circuitry. the mic2810 is a cap design, operating with very small ceramic output capacitors and inductors for stability, therefore, reducing required board space and component cost. it is available with fixed output voltages in a 16-pin 3mm x 3mm mlf ? leadless package. data sheets and support doc umentation can be found on micrel?s web site at: www.micrel.com. features ? 2mhz dc/dc converter and two ldos ? integrated power-on reset (or function for all outputs) ? adjustable delay time ? lowq ? mode ? 30a total i q when in lowq ? mode ? tiny 16-pin 3mm x 3mm mlf ? package ? thermal shutdown protection ? current limit protection dc/dc converter ? 2.7v to 5.5v input voltage range ? output current to 600ma in pwm mode ? lowq ? mode: no noise light load mode ? 53v rms output noise in lowq ? mode ? 2mhz pwm operation in normal mode ldos ? ldo1 ? 1.65v to 5.5v input voltage range ? 300ma output current ? output voltage down to 0.8v ? ldo2 ? 2.7v to 5.5v input voltage range ? 300ma output current ? output voltage down to 0.8v applications ? mobile phones ? pdas ? gps receivers ? digital still cameras ? portable media players typical application ldo vin vin1 sw ldo1 ldo2 por cset lowq en2 bias en1 mic2810-xxxyml baseband memory/dsp pgnd sgnd v in 2.7v to 5.5v 4.7f 2.2f ceramic 2.2f ceramic 0.01f 0.1f 2.2f v out 2.2h gnd gnd en vin2 10 20 30 40 50 60 70 80 90 0 100 200 300 400 500 600 output current (ma) 1.2v out efficiency v in =3.6v v in =3v v in =4.2v
micrel, inc. mic2810 february 2008 2 m9999-022008-c ordering information part number marking code voltage* junction temperature range package lead finish mic2810-44myml yd44m 1.2v/1.2v/2. 8v ?40c to +125c 16-pin 3x3 mlf ? pb-free mic2810-4gkyml yd4gk 1.2v/1.8v/2.6v ?40c to +125c 16-pin 3x3 mlf ? pb-free mic2810-4gmyml yd4gm 1.2v/1.8v/2.8v ?40c to +125c 16-pin 3x3 mlf ? pb-free MIC2810-4GPYML yd4gp 1.2v/1.8v/3.0v ?40c to +125c 16-pin 3x3 mlf ? pb-free mic2810-4gsyml yd4gs 1.2v/1.8v/3.3v ?40c to +125c 16-pin 3x3 mlf ? pb-free mic2810-4lsyml yd4ls 1.2v/2.7v/3. 3v ?40c to +125c 16-pin 3x3 mlf ? pb-free mic2810-4msyml yd4ms 1.2v/2.8v/3. 3v ?40c to +125c 16-pin 3x3 mlf ? pb-free mic2810-cgjyml ydcgj 1.2v/1.8v/2.5v ?40c to +125c 16-pin 3x3 mlf ? pb-free mic2810-fgsyml ydfgs 1.5v/1.8v/3.3v ?40c to +125c 16-pin 3x3 mlf ? pb-free notes: mlf? is a green rohs compliant package. lead fi nish is nipdau. mold compound is halogen free. other voltage options available. pl ease contact micrel for details. dc/dc ?output voltage range of 1.0v to 2.0v. ldo1 ? output voltage range of 0.8v to 3.6v. ldo2 ? output voltage range of 0.8v to 3.6v. * refers to nominal output voltage of dc/dc, ldo1, and ldo2 respectively.
micrel, inc. mic2810 february 2008 3 m9999-022008-c pin configuration 16-pin 3mm x 3mm mlf ? (ml) pin description pin number pin name pin function 1 /lowq lowq mode. active low input. logic high = full power (normal) mode; logic low = lowq mode; do not leave floating. 2 bias internal circuit bias supply. it must be de-coupled to signal ground with a 0.1f capacitor and should not be loaded. 3 sgnd signal ground. 4 pgnd power ground. 5 sw switch: internal power mosfet output switches. 6 vin supply input ? dc/dc and other circuitry shared with ldo1 and ldo2. must be connected to pin 7. 7 vin2 supply input ? ldo2. must be connected to pin 6. 8 ldo2 output of ldo2 9 ldo ldo output: connect to v out of the dc/dc for lowq mode operation. 10 vin1 supply input ? ldo1. 11 ldo1 output of ldo1 12 por power-on reset output: open-drain output. active low indicates an output undervoltage condition on either one of the three regulated outputs. 13 cset delay set input: connect external capacitor to gnd to set the internal delay for the por output. when left open, there is minimu m delay. this pin cannot be grounded. 14 en1 enable input (ldo 1). active high input. logic high = on; logic low = off; do not leave floating 15 en enable input (dc/dc). active high input. logic high = on; logic low = off; do not leave floating. 16 en2 enable input (ldo 2). active high input. logic high = on; logic low = off; do not leave floating
micrel, inc. mic2810 february 2008 4 m9999-022008-c absolute maximum ratings (1) supply voltage (v in , v in1 , v in2 )............................... 0v to 6v enable input voltage (v en , v en1 , v en2 )................... 0v to v in power dissipation .................................. in ternally limited (3) lead temperature (solde ring, 10 se c.)...................... 260c storage temperature (t s ) .........................?65c to +150c esd rating (4) .................................................................. 2kv operating ratings (2) supply voltage (v in , v in2 )................................. 2.7v to 5.5v supply voltage (v in1 )...................................... 1.65v to 5.5v enable input voltage (v en , v en1 , v en2 )................... 0v to v in junction temperature (t j ) ........................ ?40c to +125c junction thermal resistance mlf-16 ( ja ) ......................................................56c/w electrical characteristics (5) v in = v in1 = v in2 = en1 = en2 = en = /lowq = v out (6) + 1v; c outdc/dc = 2.2f, c ldo1 = c ldo2 = 2.2f; i outdc/dc = 100ma; i outldo1 = i outldo2 = 100a; t j = 25c, bold values indicate ?40c < t j < +125c; unless noted. parameter conditions min typ max units uvlo threshold rising input voltage during turn-on 2.45 2.55 2.65 v uvlo hysteresis 100 mv ground pin current v fb = gnd (not switching); ldo1 or ldo2 (en = gnd; en1 or en2 = gnd) 800 55 1100 85 95 a a a ground pin current in shutdown en = en1 = en2 = 0v 0.2 5 a ground pin current (lowq ? mode) i dc/dc < i ldo1 < i ldo2 < 10ma (/lowq = gnd) ldo1 or ldo2 (en = gnd; en1 or en2 = gnd); i out < 10ma (/lowq = gnd) 38 20 60 80 70 a a a over-temperature shutdown 160 c over-temperature shutdown hysteresis 23 c enable inputs (en; en1; en2; / lowq ) logic low 0.2 v enable input voltage logic high 1.0 v v il < 0.2v 0.1 1 a enable input current v ih > 1.0v 0.1 1 a turn-on time turn-on time (ldo1 and ldo2) 240 500 s turn-on time (dc/dc) (/lowq = v in ; i load = 300ma); (/lowq = gnd; i load = 10ma) 83 350 s por output low threshold, % of nominal (v dc/dc or v ldo1 or v ldo2 ) (flag on) 90 91 % vth high threshold, % of nominal (v dc/dc and v ldo1 and v ldo2 ) (flag off) 96 99 % vol por output logic low voltage; il = 250a 10 100 mv ipor flag leakage current, flag off 0.01 1 a set input set pin current source vset = 0v 0.75 1.25 1.75 a set pin threshold voltage por = high 1.25 v
micrel, inc. mic2810 february 2008 5 m9999-022008-c electrical characteristi cs - dc/dc converter v in = v outdc/dc + 1; en = v in ; en2 = en1 = gnd; i outdc/dc = 100ma ;l = 2.2h; c outdc/dc = 2.2f; t j = 25c, bold values indicate ?40c to + 125c; unless noted. parameter conditions min typ max units lowq = high (full power mode) fixed output voltages nominal v out tolerance ?2 ? 3 +2 +3 % % output voltage line regulation v out > 2.4v; v in = v out + 300mv to 5.5v, i load = 100ma v out < 2.4v; v in = 2.7v to 5.5v, i load = 100ma 0.2 %/v output voltage load regulation 20ma < i load < 600ma 0.1 % maximum duty cycle v fb 0.4v 100 % pwm switch on-resistance i sw = 150ma v fb = 0.7v fb_nom pmos i sw = -150ma v fb = 1.1v fb_nom nmos 0.5 0.6 ? ? oscillator frequency 1.8 2 2.2 mhz current limit in pwm mode v fb = 0.9*v nom 0.75 1 1.6 a lowq = low (light load mode) variation from nominal v out ?2 +2 % output voltage accuracy variation from nominal v out ; ?40c to +125c ? 3 +3 % line regulation v in = v out + 1v to 5.5v; i out = 100a 0.02 0.3 0.6 %/v %/v load regulation i out = 100a to 50ma 0.4 1.5 % ripple rejection f = up to 1khz 45 db current limit v out = 0v 80 120 220 ma output voltage noise 10hz to 100khz 53 v rms
micrel, inc. mic2810 february 2008 6 m9999-022008-c electrical characteristics ? ldo1/ldo2 v in1 = v in2 = v outldo1 + 1.0v or v in1 = v in2 = v outldo2 + 1.0v; en = gnd; en1 = en2 = v in1 = v in2 ; c ldo1 = c ldo2 = 2.2f; i outldo1 = 100a; t j = 25c, bold values indicate ?40c< t j < +125c; unless noted. parameter conditions min typ max units lowq = high (full power mode) variation from nominal v out ?2 +2 % output voltage accuracy variation from nominal v out ; ?40c to +125c ? 3 +3 % line regulation v in = v out +1v to 5.5v 0.02 0.3 0.6 %/v load regulation i out = 100a to 150ma i out = 100a to 200ma i out = 100a to 300ma 0.20 0.25 0.40 1.5 % % % dropout voltage i out = 150ma i out = 200ma i out = 300ma 70 94 142 300 mv mv mv ripple rejection f = up to 1khz 35 db current limit v out = 0v 400 600 850 ma output voltage noise 10hz to 100khz 91 v rms lowq = low (light load mode) variation from nominal v out ?3 +3 % output voltage accuracy variation from nominal v out ; ?40c to +125c ? 4 +4 % line regulation v in = v out +1v to 5.5v 0.02 0.3 0.6 %/v load regulation i out = 100a to 10ma 0.2 1.0 % dropout voltage i out = 10ma 22 35 50 mv mv ripple rejection f = up to 1khz 35 db current limit v in = 2.7v; v out = 0v 50 85 125 ma notes: 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. the maximum allowable power dissipation of any t a (ambient temperature) is p d(max) = (t j(max) ? t a ) / ja . exceeding the maximum allowable power dissipation will result in excessive die temper ature, and the regulator will go into thermal shutdown. 4. devices are esd sensitive. handling precautions re commended. human body model, 1.5k in series with 100pf. 5. specification for packaged product only.
micrel, inc. mic2810 february 2008 7 m9999-022008-c typical characteristics D dc/dc normal mode (/lowq = vin) 10 20 30 40 50 60 70 80 90 0 100 200 300 400 500 600 output current (ma) 1.2v out efficiency v in =3.6v v in =3v v in =4.2v 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.7 input current (v) switching frequency vs. input voltage 3.1 3.5 3.9 4.3 4.7 5.1 5.5 c out = 2.2f i out = 300ma l = 2.2h /lowq = v in 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 switching frequency vs. temperature -40 -20 0 40 60 80 100 temperature (c) 20 120 v in = 3.6v i out = 400ma /lowq = v in 1.18 1.19 1.20 1.21 1.22 0 100 200 300 400 500 600 output current (ma) load regulation c out = 2.2f v in = 3.6v l = 2.2h /lowq = v in 1.192 1.194 1.196 1.198 1.200 2.7 input voltage (v) c out = 2.2f i out = 300ma l = 2.2h /lowq = v in 3.1 3.5 3.9 4.3 4.7 5.1 5.5 line regulation 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.7 input voltage (v) current limit vs. input voltage 3.1 3.5 3.9 4.3 4.7 5.1 5.5 /lowq = v in
micrel, inc. mic2810 february 2008 8 m9999-022008-c typical characteristics D dc/dc lowq mode (/lowq = gnd) 0 10 20 30 40 50 60 70 80 0.01 0.1 1 10 100 1000 frequency (khz) power supply rejection ratio v in = 3.6v v out = 1.2v c out = 2.2f i out = 5ma /lowq = gnd 1.16 1.17 1.18 1.19 1.20 1.21 1.22 1.23 1.24 0 1020304050607080 output current (ma) load regulation c out = 2.2f v in = 3.6v /lowq = gnd 1.10 1.15 1.20 1.25 1.30 2.7 input voltage (v) line regulation 3.1 3.5 3.9 4.3 4.7 5.1 5.5 c out = 2.2f v in = 3.6v i out = 20ma /lowq = gnd 20 60 100 140 180 220 260 300 340 380 2.7 input voltage (v) current limit vs. input voltage 3.1 3.5 3.9 4.3 4.7 5.1 5.5 /lowq = gnd 0.001 0.01 0.1 1 10 output noise spectral density 1 frequency (khz) 0.1 0.01 10 100 1,000 v in = 4.2v v out = 1.2v c out = 2.2f /lowq = gnd 10,000
micrel, inc. mic2810 february 2008 9 m9999-022008-c typical characteristics D ldo1/ldo2 0 10 20 30 40 50 60 70 80 0.01 0.1 1 10 100 1000 frequency (khz) power supply rejection ratio ldo1[lowq mode] v in = 3.6v v out = 1.2v c out = 2.2f i out = 25ma /lowq = gnd 0 10 20 30 40 50 60 70 0.01 0.1 1 10 100 1000 frequency (khz) power supply rejection ratio ldo1[normal mode] v in = 3.6v v out = 1.2v c out = 2.2f i out = 100ma /lowq = v in 1.6 1.7 1.8 1.9 2.0 2.7 input voltage (v) ldo1 line regulation 3.1 3.5 3.9 4.3 4.7 5.1 5.5 c out = 2.2f v in = 3.6v i out = 150ma /lowq = v in 0 10 20 30 40 50 60 70 80 90 0.01 0.1 1 10 100 1000 frequency (khz) power supply rejection ratio ldo2[lowq mode] v in = 3.6v v out = 2.8v c out = 2.2f i out = 25ma /lowq = gnd 0 10 20 30 40 50 60 70 80 0.01 0.1 1 10 100 1000 frequency (khz) power supply rejection ratio ldo2[normal mode] v in = 3.6v v out = 2.8v c out = 2.2f i out = 100ma /lowq = v in 2.70 2.75 2.80 2.85 0 50 100 150 200 250 300 output current (ma) ldo2 load regulation c out = 2.2f v in = 3.6v /lowq = v in 55 60 65 70 75 80 0 50 100 150 200 250 300 output current (ma) ldo2 ground current vs. output current v in = 3.6v v out = 2.8v /lowq = v in 30 40 50 60 70 80 ldo2 ground current vs. temperature -40 -20 0 40 60 80 100 temperature (c) 20 120 v in = 3.6v i out = 200ma /lowq = v in 0 20 40 60 80 100 120 140 0 50 100 150 200 250 300 output current (ma) ldo2 dropout voltage vs. output current v out = 2.8v /lowq = v in 60 70 80 90 100 110 ldo2 dropout voltage vs. temperature -40 -20 0 40 60 80 100 temperature (c) 20 120 v out = 2.8v i out = 200ma /lowq = v in 0.001 0.01 0.1 1 10 ldo2 output noise spectral density 1 frequency (khz) 0.1 0.01 10 100 1,000 v in = 4.2v v out = 2.8v c out = 2.2f /lowq = v in 10,000
micrel, inc. mic2810 february 2008 10 m9999-022008-c functional characteristics ldo2 [lowq mode] load transient time (100s/div) v in = 3.6v v out = 2.8v c out = 2.2f /lowq = gnd ac coupled (50mv/div) output volta g e dc coupled (20ma/div) output current 45ma 1ma ldo2 [normal mode] load transient time (40s/div) v in = 3.6v v out = 2.8v c out = 2.2f /lowq = v in ac coupled (50mv/div) output voltage dc coupled (100ma/div) output current 200ma 10ma time (40s/div) v in = 3.6v v out = 1.2v c out = 2.2f /lowq = gnd ac coupled (20mv/div) output volta g e dc coupled (20ma/div) output current 50ma 1ma dc/dc [lowq mode] load transient time (20s/div) v in = 3.6v v out = 1.2v c out = 2.2f /lowq = gnd i out = 20ma dc coupled (2v/div) enable voltage dc coupled (500mv/div) output voltage dc/dc [lowq mode] start-up waveforms
micrel, inc. mic2810 february 2008 11 m9999-022008-c functional characteristics (cont.) dc/dc pwm waveforms time (400ns/div) v in = 3.6v v out = 1.2v c out = 2.2f l = 2.2h /lowq = v in i out = 300ma ac coupled (20mv/div) output voltage dc coupled (200ma/div) inductor current dc coupled (2v/div) switch voltage dc/dc load transient time (20s/div) v in = 3.6v v out = 1.2v c out = 2.2f l = 2.2h /lowq = v in ac coupled (50mv/div) output voltage dc coupled (200ma/div) output current 10ma 300ma dc/dc start-up waveforms time (20s/div) v in = 3.6v v out = 1.2v c out = 2.2f l = 2.2h /lowq = v in i out = 300ma dc coupled (2v/div) enable volta g e dc coupled (500mv/div) output voltage
micrel, inc. mic2810 february 2008 12 m9999-022008-c functional diagram mic2810 block diagram
micrel, inc. mic2810 february 2008 13 m9999-022008-c device functional description the mic2810 is a power management ic with a single integrated step-down regula tor and two low dropout regulators. ldo1 and ldo2 are 300ma low dropout regulators supplied from the input voltage pins. the step-down regulator is a 600ma pwm power supply. all three regulators utilize a /lowq light load mode to maximize battery efficiency under light load conditions. this is achieved with a /lowq control pin that when pulled low shuts down all the biasing and drive current for the pwm regulator, along with reducing the current limit of the two independent ldos. when the /lowq pin is pulled low, the mic2810 draws only 30a of operating current. this mode allows the output to be regulated through the ldo output which is capable of providing 60ma of output current. this method has the advantage of producing a clean, low current, ultra-low noise output in /lowq mode. during /lowq mode, the sw node becomes high impedance, blocking current flow. other methods of reducing quiesc ent current, such as pulse frequency modulation (pfm) or bursting techniques create large amplitude and low frequency ripple voltages that can be detrimental to system operation. when more than 60ma is required, the /lowq pin can be forced high, causing the mic2810 to enter pwm mode. in this case, the ldo output makes a "hand-off" to the pwm regulator with virt ually no variation in output voltage. the ldo output then turns off allowing up to 600ma of current to be efficiently supplied through the pwm output to the load. pin functional description vin/vin1/vin2 three input voltage pins provide power to the switch mode regulator, ldo1, and ldo2. vin provides power to the control circuitry of the dc/dc converter and voltage reference circuitry shar ed by all the regulators in the mic2810. ldo1?s input voltage (vin1) can go down to 1.65v but ldo2 and the dc/dc converter input voltages are limited to 2.7v minimum. for the switch mode regulator vin provides power to the mosfet along with current limiting sense circuitry. due to the high switching speed s, a 4.7f capacitor is recommended close to vin and the power ground (pgnd) pin for bypassing. please refer to the pcb layout section for an exampl e of an appropriate circuit layout. ldo the ldo pin is the output of the linear regulator and should be connected to the output of the step-down pwm regulator. in /lowq mode (/lowq <0.2v), the ldo provides the output volt age of the dc/dc regulator. ldo1 regulated output voltage of ldo1. power is provided by vin1. recommended output capacitance is 2.2f. ldo2 regulated output voltage of ldo2. power is provided by vin2. recommended output capacitance is 2.2f. en/en1/en2 all enable inputs are active high, requiring 1.0v for guaranteed operation. en prov ides logic control for the dc/dc regulator. en2 provides logic control for ldo2, and en1 provides logic control for ldo1. the enable inputs are cmos logic and cannot be left floating. the enable pins provide logic level control of the specified outputs. when all enable pins are in the off state, supply current of the device is greatly reduced (typically <1a). when the dc/ dc regulator is in the off state, the output drive is placed in a "tri-stated" condition, where both the high side p-channel mosfet and the low-side n-channel are in an ?off? or non-conducting state. do not drive any of the enable pins above the supply voltage. power-on reset (por) the power-on reset output is an open-drain n-channel device, requiring a pull-up resistor to either the input voltage or output voltage for proper voltage levels. the por output has a delay time that is programmable with a capacitor from the cset pin to ground. the delay time can be programmed to be as long as 1 second. /lowq the /lowq pin provides a logic level control between the internal pwm switching regulator mode, and the low noise linear regulator mode. with /lowq pulled low ( 0.2v), quiescent current of the device is greatly reduced by switching to a low noise linear regulator mode that has a typical supply current of 38a. in linear (ldo) mode the output can deliver 60ma of current to the output. by placing /lowq high ( 1v), the device transitions into a constant frequency pwm step-down regulator mode. this allows the device the ability to efficiently deliver up to 600ma of output current at the same output voltage. /lowq mode also limits t he output load of both ldo1 and ldo2 to <50ma. bias the bias pin supplies the power to the internal control and reference circuitry. the bias is powered from vin through an internal 6 ? resistor. a small 0.1f capacitor is recommended for bypassing.
micrel, inc. mic2810 february 2008 14 m9999-022008-c sw the switch (sw) pin connects directly to the inductor and provides the switching current necessary to operate in pwm mode. due to the high speed switching on this pin, the switch node should be routed away from sensitive nodes. pgnd power ground (pgnd) is the ground path for the high current pwm mode. the current loop for the power ground should be as small as possible. sgnd signal ground (sgnd) is the ground path for the biasing and control circuitry. the current loop for the signal ground should be as small as possible. cset the cset pin is a current so urce output that charges a capacitor that sets the delay time for the power-on reset output from low to high. the delay for por high to low (detecting an undervoltage on any of the outputs) is always minimal. the current source of 1.25a charges a capacitor up from 0v. when the capacitor reaches 1.25v, the output of the por is allowed to go high. the delay time in microseconds is equal to the cset in picofarads. por delay (s) = cset (pf) component selection output capacitor ldo1 and ldo2 outputs require a 2.2f ceramic output capacitor for stability. the dc/dc switch mode regulator also requires a 2.2f ceramic output capacitor to be stable. all output capacitor values can be increased to improve transient response, but performance has been optimized for a 2.2f ceramic on the ldos and the dc/dc regulator. x7r/x5r dielectric-type ceramic capacitors are recommended because of their temperature performance. x5r/x7r-type capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ceramic capacitors. z5u and y5v dielectric capacitors change value by as much as 50% to 60% respectively over their operating temperature ranges. input capacitor a minimum 1f ceramic, 4.7f recommended, should be placed as close as possible to the vin pin for optimal bypassing. x5r or x7r dielectrics are recommended for the input capacitor. y5v dielec trics lose most of their capacitance over temperatur e and are therefore, not recommended. a minimum 1f is recommended close to the vin and pgnd pins for high frequency filtering. smaller case size capacitors are recommended due to their lower esr and esl. please refer to the pcb layout section for an example of an appropriate circuit layout. inductor selection the mic2810 is designed for use with a 2.2h inductor. proper selection should ensure the inductor can handle the maximum average and peak currents required by the load. maximum current rati ngs of the inductor are generally given in two methods; permissible dc current and saturation current. permissible dc current can be rated either for a 40c temperature rise or a 10% to 20% loss in inductance. ensure t hat the inductor selected can handle the maximum operating current. when saturation current is specified, make sure that there is enough margin that the peak current will not saturate the inductor. peak inductor current can be calculated as follows: l f 2 v v 1 v i i in out out out pk ? ? ? ? ? ? ? ? ? + = i pk : peak inductor current i out : output/load current v in : input voltage v out : output voltage f: switching frequency of pwm regulator l: inductor value
micrel, inc. mic2810 february 2008 15 m9999-022008-c pcb layout vin c7 vin j1 l1 ld02 j5 c6 sw vin2 pgnd ldo bias en1 ldo1 ldo2 vin1 en en2 sgnd /lowq vin cset por vo vin vin vo gnd j2 c1 gnd j7 vo j6 ld0 j3 ld01 j4 por j8 en j9 en2 j11 /lowq j12 jp1 c3 r1 c4 r3 r4 r5 c5 1 2 56 12 8 7 4 9 10 11 3 13 14 15 16 c2 vin en1 j10 r2 layout schematic
micrel, inc. mic2810 february 2008 16 m9999-022008-c top layer
micrel, inc. mic2810 february 2008 17 m9999-022008-c bottom layer
micrel, inc. mic2810 february 2008 18 m9999-022008-c package information 16-pin 3mm x 3mm mlf ? (ml) micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944-0800 fax +1 (408) 474-1000 web http:/www.micrel.com the information furnished by micrel in this data sheet is belie ved to be accurate and reliable. however, no responsibility is a ssumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any time without notification to the customer. micrel products are not designed or authori zed for use as components in life support app liances, devices or systems where malfu nction of a product can reasonably be expected to result in personal injury. life suppo rt devices or systems are devices or systems that (a) are in tended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significan t injury to the user. a purchaser?s use or sale of micrel produc ts for use in life support app liances, devices or systems is a purchaser?s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2006 micrel, incorporated.

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