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| ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ?d n b y 9 7 5 45 r i ?? 1 / 7 w? ) 1 / : y w j o *r *? - "m 4 b| ?? h ?+?1? 3 / 4 6 w? 4 / 7 w ;?8 ]?? ?? [ ???1b? s ?r??1 [t$ ? *? hr?1 ??? 2 & n b y 9 7 5 4g ?? h q x n ?+ y+ ? h -0 - j]? ? 6 1 1 l i {? 3 n i { *??? ?+? h?? ]?#??? 4 ??gc?aj]? h ?t0? | o n p t ?z? w? ? i h@'? ?"c$? j a? h 1? ? h| z <]{? <]|? 5z [[ m|??z h ?d? ||(0 - h n b y 9 7 5 4] ? ? qr ) ? 2 5 n i { *?1? 9m? 1 y+ <? ? [?1? 9m??' j j jow? 1 ?' 5r q" -iu ? h| 3 1 & w q| 5 r q ??z p~?0b?? wc|r??? ?]?#??? n b y 9 7 5 4 y 5? ] r??? :?y4|? ?r?1zk??|r?1? 1 ? 2 &|r ?1 t??'? #| 1 / 2 & ?? j -2 0 - {? ( c| y j]? | ] 1 / 7 w|] ?e ?1 tw? s f g j or? |j] ?e?1 sr? 1???? \ ??|k? n b y 9 7 5 4 ?j]?? ?? .2 ?r? ?{? n b y 9 7 5 4g 3 5[ m 5 n n y 5 n no r g o? v? ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` b q p m b t j d 0 d q v 0 e t q y2 j 0 p ? e e s?? ?6?? ?g? e ??? s b j e <??? ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` v ? ? 4 8 n s e t p o n p t g f u ? 4 b ?? r ? ?s ?r??1 [t *? 2 &|r t ? 3 / 4 6 w? 4 / 7 w ?+?1 ? r?1? 1 / 7 w? ) 1 / : ! y ! w j o *? . - ? ??4?r? ?{? ? 6 1 1 l i {? 3 n i { - ? h ? ?'?# ]?2 ? ?r?? ? w j e? r?1? 1 / 7 1 / 8 1 / 9 2 / 1 2 / 3 2 / 6 2 / 9 3 / 1 [ 3 / 6 w ? rs| - [ -z? ? ? -ac 0?? 8? e e sb ? 3 5[ m 5 n n ! y ! 5 n no r g o? v? n b y 9 7 5 4 4 b 3 n i { ]1o ? ? ________________________________________________________________ maxim integrated products 1 ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ? g? 19-3970; rev 3; 9/07 ta5 n b y j nu+^at ?|ia n b y j ny !i|@?|?j t?%? |g ? ??@ia| -@?a ? t !ig??i?? \$?|eiv?l n b y j n |^at ? ?s ? e- ["d|k ?t ?? 7 n b y j n|? x x x / n b y j n . j d / d p n / d o part temp range pin-package pkg code max8643etg+ -40c to +85c 24 thin qfn-ep* 4mm x 4mm t2444-4 , -,? v? * f q ! > ! a fd [ m|??k ?t ?|" ? output 1.8v, 3a input 2.4v, 3.6v bst lx out in en v dd ctl1 ctl2 pgnd fb v dd comp pwrgd freq refin ss gnd max8643 o+5 - n b y 9 7 5 4 4 b 3 n i { ]1o ? ? 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v in = v dd = 3.3v, v fb = 0.5v, t a = -40c to +85c. typical values are at t a = +25c, circuit of figure 1, unless otherwise noted.) (note 2) stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. in, v dd , pwrgd to gnd ......................................-0.3v to +4.5v comp, fb, refin, out, ctl_, en, ss, freq to gnd...................-0.3v to (v dd + 0.3v) lx current (note 1) .....................................................-4a to +4a bst to lx..................................................................-0.3v to +4v pgnd to gnd .......................................................-0.3v to +0.3v continuous power dissipation (t a = +70c) 24-pin tqfn-ep (derated 27.8mw/ c above +70c)........................2222.2mw operating temperature range ...........................-40c to +85c junction temperature ......................................................+150c storage temperature range .............................-65c to +150c lead temperature (soldering, 10s) .................................+300c note 1: lx has internal clamp diodes to gnd and in. applications that forward bias these diodes should take care not to exceed the ics package power dissipation limits. parameter conditions min typ max units in/v dd in and v dd voltage range 2.35 3.60 v v in = 2.5v 4 4.6 in supply current f s = 1mhz, no load (includes gate-drive current) v in = 3.3v 5.5 ma v in = 2.5v 1.4 2.3 v dd supply current f s = 1mhz v in = 3.3v 2 ma total shutdown current from in and v dd v in = v dd = v bst - v lx = 3.6v, v en = 0v 13 a v dd rising 2 2.1 v dd falling 1.8 1.9 v v dd undervoltage lockout threshold lx starts/stops switching deglitching 2 s bst t a = +25c 5 bst supply current v bst = v dd = v in = 3.6v, v lx = 3.6v or 0v, v en = 0v t a = +85c 10 a pwm comparator pwm comparator propagation delay 10mv overdrive 20 ns comp comp clamp voltage, high v in = 2.35v to 3.6v 2 v comp slew rate 1.4 v/s pwm ramp amplitude 1v comp shutdown resistance from comp to gnd, v en = v ss = 0v 8 error amplifier preset output-voltage accuracy refin = ss -1 select from table 1 +1 % fb regulation accuracy using external resistors ctl1 = ctl2 = gnd 0.594 0.600 0.606 v fb to out resistor all vid settings except ctl1 = ctl2 = gnd 5 8 11 k n b y 9 7 5 4 4 b 3 n i { ]1o ? ? _______________________________________________________________________________________ 3 electrical characteristics (continued) (v in = v dd = 3.3v, v fb = 0.5v, t a = -40c to +85c. typical values are at t a = +25c, circuit of figure 1, unless otherwise noted.) (note 2) parameter conditions min typ max units open-loop voltage gain 1k from comp to gnd 115 db error-amplifier unity-gain bandwidth parallel 10k , 40pf from comp to gnd (note 3) 14 26 mhz v dd = 2.35v to 2.6v 0 v dd - 1.65 error-amplifier common-mode input range v dd = 2.6v to 3.6v 0 v dd - 1.7 v sourcing 1000 error-amplifier minimum output current v comp = 1v sinking -500 a fb input bias current v fb = 0.7v, ctl1 = ctl2 = t a = +25c -200 -40 na ctl_ v ctl_ = 0v -7 ctl_ input bias current v ctl_ = v dd +7 a rising 0.75 high-impedance threshold falling v dd - 1.2v v hysteresis all vid transitions 50 mv refin refin input bias current v refin = 0.6v t a = +25c -500 -100 na v dd = 2.3v to 2.6v 0 v dd - 1.65 refin common-mode range v dd = 2.6v to 3.6v 0 v dd - 1.7 v refin offset voltage ctl1 = ctl2 = gnd, t a = +25c -3 +3 mv lx (all pins combined) v in = v bst - v lx = 2.5v 39 lx on-resistance, high side i lx = -2a v in = v bst - v lx = 3.3v 37 58 m v in = 2.5v 36 lx on-resistance, low side i lx = 2a v in = 3.3v 34 55 m lx current-limit threshold v in = 2.5v, high-side sourcing 4 5.5 a v lx = 0v -2 t a = +25c v lx = 3.6v +2 v lx = 0v 1 lx leakage current v in = 3.6v, v en = v ss = 0v t a = +85c v lx = 3.6v 1 a r freq = 50k 0.9 1 1.1 lx switching frequency v in = 2.5v to 3.3v r freq = 23.2k 1.8 2.0 2.2 mhz frequency range 500 2000 khz lx minimum off-time v in = 2.5v to 3.3v 40 75 ns lx maximum duty cycle r freq = 50k , v in = 2.5v to 3.3v 93 96 % lx minimum on-time 80 ns rms lx output current 3a efficiency vs. output current output current (a) efficiency (%) max8643 toc02 60 65 75 70 80 85 90 95 100 0.1 1 10 v out = 1.5v v out = 1.88v v in = v dd = 2.5v v out = 1.2v n b y 9 7 5 4 4 b 3 n i { ]1o ? ? 4 _______________________________________________________________________________________ ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ?o ?+v (typical values are at v in = v dd = 3.3v, v out = 1.8v, r freq = 50k , i out = 3a, and t a = +25c, unless otherwise noted.) efficiency vs. output current output current (a) efficiency (%) max8643 toc01 40 50 60 80 70 90 100 0.1 1 10 v out = 1.8v v out = 2.5v v in = v dd = 3.3v v out = 1.2v parameter conditions min typ max units enable en input logic-low, falling 1.2 0.7 v en input logic-high, rising 1.7 1.4 v en hysteresis 200 mv t a = +25c 1 en, input current v en = 0v or 3.6v, v dd = 3.6v t a = +85c 0.01 a ss ss charging current v ss = 0.45v 7 8 9 a ss discharge resistance 500 thermal shutdown thermal-shutdown threshold +165 c thermal-shutdown hysteresis 20 c power-good (pwrgd) power-good threshold voltage v fb falling, 3mv hysteresis 87 90 93 % power-good falling-edge deglitch 48 clock cycles pwrgd output-voltage low i pwrgd = 4ma 0.03 0.15 v pwrgd leakage current v dd = v pwrgd = 3.6v, v fb = 0.9v 0.01 a overcurrent limit current-limit startup blanking 128 clock cycles restart time 1024 clock cycles note 2: specifications are 100% production tested at t a = +25c. limits over the operating temperature range are guaranteed by design and characterization. note 3: guaranteed by design. electrical characteristics (continued) (v in = v dd = 3.3v, v fb = 0.5v, t a = -40c to +85c. typical values are at t a = +25c, circuit of figure 1, unless otherwise noted.) (note 2) ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ?o ?+v )? * (typical values are at v in = v dd = 3.3v, v out = 1.8v, r freq = 50k , i out = 3a, and t a = +25c, unless otherwise noted.) n b y 9 7 5 4 4 b 3 n i { ]1o ? ? _______________________________________________________________________________________ 5 frequency vs. input voltage input voltage (v) frequency (khz) max8643 toc04 2.2 2.6 3.0 3.4 3.8 900 1050 1200 1350 1500 1650 1800 1950 +25 c -40 c +85 c +25 c -40 c +85 c load regulation load current (a) output voltage charge (%) max8643 toc05 012345 -0.16 -0.14 -0.12 -0.10 -0.08 -0.06 -0.04 -0.02 0 v out = 1.8v v out = 1.2v v out = 2.5v v in = v dd = 3.3v load transient 40 s/div max8643 toc06 i out v out 1a/div 0a ac-coupled 50mv/div v in = v dd = 3.3v switching waveforms 100ns/div max8643 toc07 v lx i lx v out 2v/div 2a/div 0v 0a ac-coupled 20mv/div soft-start waveforms 400 shutdown waveforms 10 s/div max8643 toc09 v out v en 1v/div 2v/div 0v 0v r load = 1 efficiency vs. output current output current (a) efficiency (%) max8643 toc03 60 65 70 75 80 85 90 95 100 0.1 1 10 v out = 1.2v v out = 1.5v v out = 1.8v v in = 2.5v v dd = 3.3v n b y 9 7 5 4 4 b 3 n i { ]1o ? ? 6 _______________________________________________________________________________________ ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ?o ?+v )? * (typical values are at v in = v dd = 3.3v, v out = 1.8v, r freq = 50k , i out = 3a, and t a = +25c, unless otherwise noted.) input current vs. input voltage input voltage (v) input current ( a) max8643 toc10 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 0 1 2 3 4 5 6 7 8 9 10 v en = 0v current limit vs. output voltage output voltage (v) current limit (a) max8643 toc11 0.5 1.0 1.5 2.0 2.5 0 1 2 3 4 5 6 7 hiccup current limit 400 s/div max8643 toc12 i in i out v out 5a/div 1a/div 1v/div 0a 0a 0v rms input current during short circuit vs. input voltage (c4 = 0.022 f) input voltage (v) rms input current (a) max8643 toc13 2.0 2.5 3.0 3.5 4.0 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 v out = 0v exposed pad temperature vs. ambient temperature temperature ( c) exposed pad temperature ( c) max8643 toc14 0 20406080100 10 20 30 40 50 60 70 80 90 100 110 v out = 1.8v 3a load measured on a max8643evkit feedback voltage vs. temperature temperature ( c) feedback voltage (v) max8643 toc15 -40 -15 10 35 60 85 0.56 0.57 0.58 0.59 0.60 0.61 0.62 0.63 0.64 soft-start with refin 200 s/div max8643 toc16 v pwrgd v out v refin i in 1v/div 2v/div 1a/div 0v 0v 0a 0.5v/div 0v n b y 9 7 5 4 4 b 3 n i { ]1o ? ? _______________________________________________________________________________________ 7 ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` [ m? 1, 7 gnd 2v dd 3, 4 ctl1, ctl2 5 refin 6ss 8 comp 9fb 10 out 11 freq 12 pwrgd 13 bst 14, 15, 16 lx 17C20 pgnd 21, 22, 23 in 24 en ep [ m a ? y ? ?? [l 5r?0 - 2 1 ? { w e e ? j o w e e ? h o e . { 2 g?#?? ??r?1? r? d u m 2 [ d u m 3? :?y4|??r?1??r?1 -l e- 2 j] ?er? { s f g j o? t t '] 1 / 7 w ?e { s f g j o?j] ?e?1 ? g c'?? ? s f g j o?1 j d ? ? y+ s f g j o] o? h o e ??r?? t t [ h o e? . { ??2??? .? ???? .|.g??l ?? [ s f g j o ] j ?1? 9m|r? d p n q? g c? . {|w?? e j d ? ? y+ d p n q] o? h o e ( cr? s g c {?r [ h o e? .j]? j1||f??r?1 -??u 1 / 7 w? w j o | : 1 & *? d u m 2 [ d u m 3? :?y4|??r?1 ? g c?r? . { s d? e r?1 6? {?r'j]? j1 s p v u? 9 il? h? ? g s f r [ h o e? . { ? ?? ? h ?? ?ri w g c w s f g j o | : 1 & t 1 / 7 w 'r? ? w g c ?? ??| : 1 & q x s h e] o???3 j d ? ? y+ w e e t w j o ?? v w m p ?" tw j d ?z ? y+ q x s h e ?] o? n p t g f uq???g 1 / 2 g??l 5 c t u? m y ? {?? m y[ m ??] {?? {?? m y[ m?r? j d ? ? y+ m y? ? ? h?-j] {?? q h o e[ m? ? h?? ??r?r??? *?? 3 / 4 6 w? 4 / 7 wg 3 3 g?#??j]l 5? q h o el e ?ob? 5 'r? ] r??' 0 ? n b y 9 7 5 4 a fd {?m a {??2? ?2zv n b y 9 7 5 4 4 b 3 n i { ]1o ? ? 8 _______________________________________________________________________________________ ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` 1 vd control logic in lx pgnd in bst thermal shutdown soft-start voltage reference bias generator oscillator 1v p-p shutdown control uvlo circuitry v dd shdn fb 0.9 x v refin ss fb comp gnd pwrgd freq error amplifier pwm comparator current-limit comparator ilim threshold bst capacitor charging switch lx comp low detector en refin vid voltage- control circuitry out ctl2 ctl1 8k max8643 n b y 9 7 5 4 4 b 3 n i { ]1o ? ? _______________________________________________________________________________________ 9 c10 0.1 f c6 22 f output 1.8v, 3a input 2.4v to 3.6v c7 0.01 f c5 1 f r5 10 v dd bst lx out in v dd ctl2 ctl1 pgnd fb c1 33pf c2 1500pf r1 20k r2 2.67k comp l1 0.47 h c3 560pf c4 0.022 f r4 50k c8 22 f c9 0.01 f r3 158 pwrgd en freq refin ss gnd v dd max8643 d 2 / ! 2 n i { w p v u > ! 2 / 9 w |]?#??? ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` .? n b y 9 7 5 4? i h?1 y+ ? ?? 4 b|r ? ? n b y 9 7 5 4 ?+? 3 / 4 6 w? 4 / 7 wr??? *? -2 1 / 7 w? ) 1 / : y w j o *r?1' ;?8 ] ?? ??b?s ?r??1 [t$ ? * ? hr?1 t?? 2 & n b y 9 7 5 4 ?? q| ? h *? -2#]?#?? ? 2 p~?0b ? h??gc?aj ]? h n b y 9 7 5 4gco ) 5 n n y 5 n n *? 3 5[ mo r g o v? s f g j o' n b y 9 7 5 4 - /? e e s [ ?? [? g]? s e t p o ) 4 8 n * o ?x n p t g f u??? [ ? h ?? i h n b y 9 7 5 4g?1 y+ <? ? r? qr ) ? 2 5 n i { * ? 9m?1 y+ <? ? ?? i 3 n i {| ? h ?c ?? 5? a ?1?? 9mg j j jow? 1 ? j ? ? h|r q2 y{ p~?0b - ?|?? .# ?? ?c ?r?? ? {? i w g c iu w s f g j o | : 1 & t?? 1 / 6 5 w ?? ? ) q x s h e * 'r$? ?3 <? ? <? ] ? 5?|? v ?y4r??1 ? [t h n p t g f u|4 9u? ?+ y+ ? "? [t? ??? <? ] ? 5 {c q x n w|r? [? n p t g f u |q?g s ? ? ] ] [ ????| ?j <? <? ] ? 5?1? 9m? |?g sil? |s?g s0 - q x n w ?r w?%? ?? | q x ng s ?il2e| * ?t0 is??1 - w d p n q g s?1 tw" ?" ?2 ??il|?2e? ?t0 ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ?ob? 5 n b y 9 7 5 4 4 b 3 n i { ]1o ? ? 10 ______________________________________________________________________________________ ? "? ] n p t g f u ?? 6 / 6 b )?o? * y?? ?"i- m y |? % ?" n p t g f u 4 l 4[s 4[s ?? ??u ? ? b?? " ?"2z s ]?4 9 @ ]?r?1??y? ?" n b y 9 7 5 4 gle y+ v 4? ra 5 ` -z " e .? + w g c ?? 5 3 1 n w@&?? ??3| . - 2 3 t h ??le y+ n p t g f u [4[s ? ?4 d p n q [ s f g j o?] o?? + s f g j o [ t t {?? ?z y [ m ?? o? h? ? ? 2 1 3 5 ?2e2 ?? 2 3 9 ?2e?b? ? +t?" | g?9 h a ?u? ?+ y+ e h( ??le y+ ?? [ s f g j o n b y 9 7 5 4 ? - ?|?? ? v"?? -|| ?{? 9 b )?o? *? ? {? t t|j]?? ? r??? .? {? t t? h o e? .|j]?? ? v ???|????+ ?? | u t t ???|?? .]?? ? n b y 9 7 5 4 -2j { ?er? ) s f g j o * j d ? g c'??? s f g j o?1?gj] ?e ]???id 3 ?,?gj] ?e '??| 1 { s f g j o ? t t2'] 1 / 7 w ?e 1?? ) v w m p * | w e e ]?? 3 w )?o? *2 v w m p? 5 s ? ?+a w e e ? ? 3 w )?o? *2? v w m p s ? @( *?? -? 2 1 1 n w ??4? t ?w c t u o ?x | ?q??1? =?? 1? 5? i? n p t g f ut0 {? c t u[ m [ m y[ m? .| ??? w j o ???i? n p t g f u ? s =??? |?1? u m y?1?] n p t g f u ? |t0?1 ? h? ) g s f r * ? h -? ? ? 6 1 1 l i {? 3 n i { *? ?r ?? ? {? g s f r [ h o e? .|? ) s g s f r * v? ? j d| ? h s g s f r 1+?? | g t ??e?| ? h]?? i { ?? ?r ) q x s h e * q x s h e? 'ri w g c - 1 / : y w s f g j o $? ?i w g c ?????1| : 1 &@&?? 5 9 ?2e q x s h e o???3 ? y+ q x s h e? ??3 r?1 ) d u m 2 d u m 3 * ?- 2?,r?15? d u m 2 [ d u m 3| ] ?[ m ??| d u m 2 [ d u m 3???3r?? w e e ? 9 [ h o e d u m 2 [ d u m 3| ] ??????r? ??a h?'y ?$ d u m 2 [ d u m 3? + ?r?1 ?r?d ??d??? t f o @?('r??d r k sf s freq s =? 50 095 1 005 . (.) c at v ss = 8 06 . ctl1 ctl2 v out (v) gnd gnd 0.6 v dd v dd 0.7 gnd unconnected 0.8 gnd v dd 1.0 unconnected gnd 1.2 unconnected unconnected 1.5 unconnected v dd 1.8 v dd gnd 2.0 v dd unconnected 2.5 - 2 / ! d u m 2 [ d u m 3r?1? c r2 r1 refin max8643 d 3 / ! gj] ?e ?o|??# 1 n b y 9 7 5 4 4 b 3 n i { ]1o ? ? ______________________________________________________________________________________ 11 ? y+ q? f o? h o e2 ? j d% ??? s ]? 2 3 b2 ?e . m y? ?q? f o? ?3' n b y 9 7 5 4 z? ? z -? ? ?"? h| ? ri ? - u k > , 2 7 6 d t ? h ?? ??2 ]? `ti ? ] 3 1 d2 ?t s(? h? ? - h .lrz ? - ?f ? s?d *?? - ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` bg? j o [ w e e w ? ? ??? ? ht?| @' n b y 9 7 5 4r t"m ?? w j o [ q h o e? . { 3 3 g|?? w j o ?rw ?4 ? w e e [ h o e? . { 2 g| ?? w e e ?rw ? szk?? - # j d 9? ? ? ?m a| ?+ v? ? ? | m j s?"c4 9? ?f? x ?? | ?{u" |v [??v? m j s' ?? 3 1 &? 5 1 & ? ?|?a? ? ? -c|? e uv0? o$? `? 5" ? y yg \? ` `? ?m2?z? n b y 9 7 5 4|? "?y? [ r??? ? r??| flk???? f t s f t m [ ?? 1?zklkl0 e d . e dt |s??vr ?f?1 [~?0br?f5??@?r?? ||? w$ ??? f t s?|1 ]2 f t m?|1 ]? | ??r?? f t s [ f t m[?|r?1? f? |??r?? f t s [ f t m[?|r?f j0?? t|"m|2 y?? ? ) j q . q *?? ?zk ?+ v? ?*???c"?|s?0 - ? t? e?|?b v ?0??f? c{ u|r?1?fc??? ?5 ?? ?f ? |p??2g wm|? ? s ]?r? 1?fg?#???t ? h y{ w? | f t s [ f t mg?#?? ?? f t m?[?|?f ?1 -2 ? ry ?~?0b w??? |r??? ?~?0 be .r~ .$ ? ?? f t s y j m p b e ? <?+ (b?r?? s ?[ kmmcs ?? [r???2 ? <? a t+0b ?r ?1???|?1? <?0b .s ? r q ? |r q ?? ? p|0b . ??1 -?? -?1?.?l e w?? ] j i vv fl x v v pp in out s out in ? = ? v i t x esl ripple esl pp off () = ? v i t x esl ripple esl pp on () = ? v i x esr ripple esr p p () = ? v i xc xf ripple c pp ou t s () = ? 8 vv vv ripple ripple c ripple esr ripple esl =+ + () () () l vvv f v lir i out in out s in out max = ? () () n b y 9 7 5 4 4 b 3 n i { ]1o ? ? 12 ______________________________________________________________________________________ r???? r????e? ]? vr???|? y? ? j d || r?????? tm? e?+ |?2?r??f?1??* *?@&' ( c?r???| ??f? "c? | w j o . s j q q m f ?r??????|"mr??f?1 pg ????"cr??1| 3 & e?4 9 ) w p v u 0 w j o * u t ? 2e ) 2 0 g t * ? ? h|r??? bc?r???| 2?z ? ? y0 -r?? 5 3?r??? l 5? ??? ?m|r???r??? ? x ? ?[?|?f? |g s n tr?? f? ?+ ?? | j s j q q m f ?r? s n t?f? w?? ??r =k?w ?? [ ? ?w ???r if? m [r if?? d p ? r if??| f t s ? ?w ?? [ ?? h?+ ? | s m ?r? | e d s [] ? s e t p o | [ s e t p o |?o?? 4 8 n s p ?r ?? ??? ?r?12 ?r? f t s?r if??| ?i ? ? +?? 4o s|r??@ ?+| f t s??] r??| f t s2r??|k n b y 9 7 5 4 ? h??g?#r?????# ??| f t s0? j?br =k ?|? h ?]? dts? h g d @& ? ?yw?? if? [r ??? |w ??w ??? 5 1 e c 0 ??| dq ? [ 2 9 1 0 ??|$$? 9m?w ? ?dq ? [$$2 y{ ??| qr ; p%gd 4 [d 5|?,| j j jow?? e j j jow? ?? ?? [ y ?|? ?? g q 2 ` f b ? ? ) e d * j j jow?| ?? [ ????+ ? f x esr x c z esr o _ = 1 2 ff xlxc x r esr rr plc p lc o o ol 12 1 2 __ == + + ? ? ? ? ? ? ii vvv v ripple load out in out in = ? () c dxt xi v in min s out in ripple _ = ? l c out v out r3 r4 r1 comp fb out ctl1 ctl2 lx c1 c3 r2 c3 r2 c2 l a) external resistor-divider b) internal preset voltage c out v out r3 8k r1 comp out fb ctl1 voltage select ctl2 lx c1 c2 max8643 max8643 d 4 / ! j j jow?? e n b y 9 7 5 4 4 b 3 n i { ]1o ? ? ______________________________________________________________________________________ 13 ?d 1 ?? d 2 ? ? d 3 [ s 4 ? ? s 3| #? ? #???kb |? azk ?? [ ?|?????r =k|w ?? [ f t s ?|? h ? 5?e?| r q| =k a? ?d ? n b y 9 7 5 4w?? h|.[ ?i n b y 9 7 5 4r?1???????1 s 4? j d ]? s 5y@? )d 4 c * ? n b y 9 7 5 4 ?rj] ?? )d 4 b *r?1? + ?? | - ? h g d b? ? h g t | 2 1 &? 3 1 &? . w | - ? h -2{u ? p|~?0ba g d ?? d 2 ? ? e 1 ?r ? ??r m dw ??| v s j j jow?| y ?? h????? m dw ??? h2# ?|$ ?w? s y ?? h??? m dw ??? h| 9 1 & -2{u? s? w? ?? g q 3 ` f b ??u g [ ` f t s -{u? s? w? ????u ? h| 2 0 32 y{k$ ?? ??m+ v d 3? i - ? h ?w ??? h ?d 1 - i|w?i - ? h ???w ??? h # | - ? h ? {|? h??z?= z ] ? s 2|? ? - ?c - ? h%j? + - ? hm ? 3 1 1 l i { s j j jow?|? ????? # ? h 2 $?? ? s 4|n @?? 3 l ? 2 1 l ?@? +? ?$ s 5 ? v??y4r 5w?? y$ c xr x f s 2 1 12 = r c x esr c o 2 3 = c xr x l x c x r esr rr oo lo 3 1 08 3 = + + . () r xc x l x c x r esr rr oo lo 1 1 08 1 = + + . () c v xxrx r r f in l o c 1 1 5625 231 = + . () r r v out 4 06 3 06 = ? () . . double pole gain (db) second pole first and second zeros power-stage transfer function compensation transfer function open-loop gain third pole d 5 / ! j j jow?, ? n b y 9 7 5 4 4 b 3 n i { ]1o ? ? 14 ______________________________________________________________________________________ ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` `g? process: bicmos q d cz e [zv | q d cz y{???| ?+? ;?? n @lm n b y 9 7 5 4? e?|z v y{" v?i u ? | q d cz ?%- e ? 2 * sr? [r?? {? ? h? s???? {?g s? 3 * s w e e w j o [ t t?|?? -? # j d 9?@ &$b|[ mg? {#? ? h? ) {? q h o e * [g s? ) {? h o e *? a 4 * -??a& q|m? 5 ?a ? 5 ?@ -?c? m yr?? [r???p? | ? 5 5 * s j o m y [ q h o e j0 {? wm| g5 a2 ?e j d2z ?[ i h [?e - #v 6 * i???| ( c {a ? { ( c? [w?? h b - # j d 9? 7 * ? ??|# )? m y *b ?e - e | y l? ) g c d p n q * thin qfn max8643 19 20 21 22 12 3456 18 17 16 15 14 13 23 24 12 11 10 9 8 7 pgnd in pgnd in en gnd v dd ctl1 ctl2 refin ss pgnd pgnd lx lx bst in pwrgd out freq fb gnd comp lx top view + ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` [ m|? n b y 9 7 5 4 4 b 3 n i { ]1o ? ? ______________________________________________________________________________________ 15 ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` v?g? ( tk ?t ? | v?d -y5" | ???" | v?jpg??? www.maxim-ic.com.cn/packages ) 24l qfn thin.eps n b y j ny n b y j n?-2j|? \? 5' ? y ?? - n b y j n? ?? \ . ??? \0| ? ??- t ? [ ?|z ? 16 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2007 maxim integrated products 5 n b y j n ! j o u f h s b u f e ! q s p e v d u t - ! j o d / |?* n b y 9 7 5 4 4 b 3 n i { ]1o ? ? ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` v?g? )? * ( tk ?t ? | v?d -y5" | ???" | v?jpg??? www.maxim-ic.com.cn/packages ) ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ?? ?% s f w ! 3||? ?? 2 5 6 7 2 4 C 2 7 s f w ! 4||? ?? 2 3 5 9 2 4 2 6 2 7 n b y j n ? ?0 ? 9 4 3 9g( ?v i 2 1 1 1 9 4 ? e? ?? 9 1 1 ! 9 2 1 ! 1 4 2 1 ? ?? 1 2 1 . 7 3 2 2 6 2 : : ^? 1 2 1 . 7 3 2 2 6 3 : : |
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