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data sheet rev. 1.0 0 / april 2013 zspm4012 b high efficiency 2 a synchronous buck converter analog power ics power ful and determined
ZSPM4012B high ef ficiency 2a synchronous buck converter ? 201 3 zentrum mikr oelektronik dresden ag rev.1.0 0 april 4 , 2013. all rights reserved. the material c o ntained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is subject to changes without notice. for more information, contact zmdi via analog@zmdi.com . brief description the ZSPM4012B is a dc/dc synchronous switching regulator with fully integrated power switches, in ternal compensation, and full fault protection. the 1mhz switching frequency enables using small filter components, resulting in reduced board space and reduced bill - of - materials costs. the ZSPM4012B utilizes current mode feedback in normal regulation puls e - width modulation ( pwm ) mode. when the regulator is disabled (en pin is low), the ZSPM4012B draws less than 10 a quies - cent current. the ZSPM4012B integrates a wide range of protection circuitry , including input supply under - voltage lockout, output voltag e soft start, current limit, v out over - voltage, and thermal shutdown. the ZSPM4012B includes supervisory reporting through the pg (power good) open drain output to interface o ther components in the system. features ? output voltage options (depends on order code): ? fixed output voltages: 1.5v, 1.8v, 2.5v, 3.3v, or 5v with +/ - 2% output tolerance ? adjustable output voltage range: 0.9v to 5v with +/ - 1.5% reference ? wide input voltage range: 4. 5 v to 24v ? 1mhz +/ - 10% fixed switching frequency ? 2 a c ontinuous outpu t current ? high efficiency C up to 95% ? current mode pwm control with pulse - frequency modulation ( pfm ) mode for improved light load efficiency ? voltage supervisor for v out reported at the pg pin ? input supply under voltage lockout ? soft start for controlled st artup with no overshoot ? full protection for over - current, over - temperature, and v out over - voltage ? less than 10 a in disabled m ode ? low external component count benefits ? increased battery life ? minimal external component count (3 capacitors, 1 inductor) ? in herent fault protection and reporting available support ? evaluation k it ? d ocumentation physical characteristics ? junction operating temperature - 40 c to 125 c ? packaged in a 16pin qfn (3x3 mm ) related zmdi products ? zspm401 1 b / zspm4013 b : 1 a/3a synchronous buck co nverters, available with adjustable out - put from 0.9 to 5v or fixed output voltages at 1.5v, 1.8v, 2.5v, 3.3v, 5.0v (16 - lead 3x3 mm qfn) ? zspm1000: >5a single - phase, single - rail, true digital pwm controller ( 24 - pin 4x4 mm qfn) ZSPM4012B application circuit s z s p m 4 0 1 2 b v o u t a d j u s t a b l e o u t p u t p g n d v s w v c c f b g n d b s t v c c p g p g r t o p r b o t 1 0 k ( o p t i o n a l ) v o u t e n e n c b y p a s s l o u t c o u t c b s t z s p m 4 0 1 2 b v o u t f i x e d o u t p u t e n p g n d v s w v c c f b g n d v c c e n p g p g 1 0 k ( o p t i o n a l ) v o u t b s t c b y p a s s c b s t c o u t l o u t
ZSPM4012B high efficiency 2a synchronous buck converter ? 201 3 zentrum mikr oelektronik dresden ag rev.1.0 0 april 4, 2013 all rights reserved. the material c o ntained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior writte n consent of the copyright owner. typical applications ? wireless access points, cable modems ? set - top boxes ? dvd, lcd, led supplies ? portable products, including gps, smart phones, tablet pcs ? printers ZSPM4012B block diagram ordering information ordering code description package zspm4012 b a1 w00 2 a s ynchronous b uck c onverter: adjustable output, 0. 9 v to 5v , 16 - pin 3x3mm qfn 7 reel with 1000 ics zspm4012 b a1w15 2 a synchronous buck converter: fixed output, 1.5v,16 - pin 3x3mm qfn 7 reel with 1000 ics zspm4012 b a1w18 2 a synchronous buck converter: fixed output, 1.8v,16 - pin 3x3mm qfn 7 reel with 1000 ics zspm4012 b a1w25 2 a synchronous buck conve rter: fixed output, 2.5v,16 - pin 3x3mm qfn 7 reel with 1000 ics zspm4012 b a1w33 2 a synchronous buck converter: fixed output, 3.3v,16 - pin 3x3mm qfn 7 reel with 1000 ics zspm4012 b a1w50 2 a synchronous buck converter: fixed output, 5.0v,16 - pin 3x3mm qfn 7 r eel with 1000 ics zspm4012 b k it zspm4012 b e valuation k it for 2 a synchronous buck converter kit sales and further information www.zmdi.com analog@zmdi.com zentrum mikroelektroni k dresden ag global headquarters grenzstrasse 28 01109 dresden, germany central office: phone +49.351.8822.0 fax +49.351.8822.600 zmd america, inc. 1525 mccarthy blvd., #212 milpitas, ca 95035 - 7453 usa usa phone +855.275.9634 zentrum mikroelektronik dresde n ag, japan office 2nd floor, shinbashi tokyu bldg. 4 - 21 - 3, shinbashi, minato - ku tokyo, 105 - 0004 japan zmd far east, ltd. 3f, no. 51, sec. 2, keelung road 11052 taipei taiwan zentrum mikroelektronik dresden ag, korea office u - space 1 building 11th floor, unit ja - 1102 670 sampyeong - dong bundang - gu, seongnam - si gyeonggi - do, 463 - 400 korea phone +82.31.950.7679 fax +82.504.841.3026 phone +408.883.6310 fax +408.883.6358 phone +81.3.6895.7410 fax +81.3.6895.7301 phone +886.2.2377.8189 fax +886.2.2377.8199 european technical support phone +49.351.8822.7.772 fax +49.351.8822.87.772 disclaimer : this information applies to a product under development. its characteristics and specifications ar e s ubject to change without notice. zentrum mikroelek tronik dresden ag (zmd ag) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. the information furnished hereby is believed to be true and accurate. however, under no circumstances shall zmd ag be liable to a ny customer, licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever arisin g out of or in any way related to the furnishing, performance, or use of this technical data. zmd ag hereby expressly disclaims an y liability of zmd ag to any customer, licensee or any other third party, and any such customer, licensee and any other third party hereby waives any liab ility of zmd ag for any damages in connection with or arising out of the furnishing, performance or us e of this technical data, whether based on contract, warranty, tort (including negligence), strict liability, or otherwise. european sales (stuttgart) phone +49.711.674517.55 fax +49.711.674517.87955 v c c o v e r c u r r e n t p r o t e c t i o n g a t e d r i v e g a t e d r i v e b o o t s t r a p v o l t a g e v c c g a t e d r i v e c o n t r o l f b v s w v r e f & s o f t s t a r t o s c i l l a t o r r a m p g e n e r a t o r c o m p a r a t o r e r r o r a m p g n d u n d e r - v o l t a g e p r o t e c t i o n m o n i t o r & c o n t r o l t h e r m a l p r o t e c t i o n o v e r - v o l t a g e p r o t e c t i o n v c c f b v c c v c c b s t ? e n p g n d p g p f m m o d e c o m p a r a t o r v r e f 4 . 2 v c o m p e n s a t i o n n e t w o r k h i g h - s i d e s w i t c h l o w - s i d e s w i t c h
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 4 of 22 contents 1 ZSPM4012B characteristics ................................ ................................ ................................ ............................... 6 1.1. absolute maximum ratings ................................ ................................ ................................ .......................... 6 1.2. thermal characteristics ................................ ................................ ................................ ................................ 6 1.3. recommended operatin g conditions ................................ ................................ ................................ .......... 7 1.4. electrical characteristics ................................ ................................ ................................ .............................. 7 1.5. regulator characteristics ................................ ................................ ................................ ............................. 8 2 typical performance characteristics C zspm401x family ................................ ................................ ............... 10 3 description of circuit ................................ ................................ ................................ ................................ ......... 13 3.1. block diagram ................................ ................................ ................................ ................................ ............ 13 3.2. internal protection details ................................ ................................ ................................ .......................... 14 3.2.1. internal current limit ................................ ................................ ................................ ........................... 14 3.2.2. thermal shutdown ................................ ................................ ................................ ............................... 14 3.2.3. voltage reference soft - start ................................ ................................ ................................ ............... 14 3.2.4. vcc under - voltage lockout ................................ ................................ ................................ ................ 14 3.2.5. output over - voltage protection ................................ ................................ ................................ ........... 15 3.2.6. output under - voltage monitoring ................................ ................................ ................................ ........ 15 4 application circuits ................................ ................................ ................................ ................................ ............ 16 4.1. selection of external components ................................ ................................ ................................ ............. 16 4.2. typical application circuits ................................ ................................ ................................ ......................... 16 5 pin configuration and package ................................ ................................ ................................ ......................... 17 5.1. marking diagram & pin - out ................................ ................................ ................................ ........................ 18 5.2. pin description for 16 lead 3x3mm qfn ................................ ................................ ................................ . 19 5.3. detailed pin description ................................ ................................ ................................ ............................. 20 5.3.1. unregulated input, vcc (pins # 2, 3) ................................ ................................ ................................ .. 20 5.3.2. bootstrap control, bst (pin #10) ................................ ................................ ................................ ........ 20 5.3.3. sense feedback, fb (pin #5) ................................ ................................ ................................ .............. 20 5.3.4. switching output, vsw (pins #12, 13) ................................ ................................ ................................ 20 5.3.5. ground, gnd (pin #4) ................................ ................................ ................................ ......................... 20 5.3.6. power ground, pgnd (pins #14, 15) ................................ ................................ ................................ .. 20 5.3.7. enable , en (pin #9) ................................ ................................ ................................ ............................. 20 5.3.8. pg output, pg (pin #8) ................................ ................................ ................................ ....................... 20 6 ordering information ................................ ................................ ................................ ................................ ......... 21 7 related documents ................................ ................................ ................................ ................................ ........... 21 8 glossary ................................ ................................ ................................ ................................ ............................ 21 9 document revision history ................................ ................................ ................................ ............................... 22
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 5 of 22 list of figures figure 2.1 startup response ................................ ................................ ................................ ................................ 10 figure 2.2 100ma to 1a load step (vcc= 12v, vout =1.8v) ................................ ................................ ........... 10 figure 2.3 100ma to 2a load (vcc=12v, vout = 1.8v) ................................ ................................ .................... 10 fi gure 2.4 100ma to 1a load step (vcc=12v, vout = 3.3v) ................................ ................................ ........... 10 figure 2.5 100ma to 2a load step (vcc=12v, vout = 3.3v) ................................ ................................ ........... 10 figure 2.6 line transient response (vcc=10v to 15v, vout = 3.3v) ................................ ............................. 10 figure 2.7 load regulation ................................ ................................ ................................ ................................ ... 11 figure 2.8 line regulation (i out =1a) ................................ ................................ ................................ .................... 11 figure 2.9 efficiency vs. output current ( vout = 1.8v) ................................ ................................ ..................... 11 figure 2.10 efficiency vs. output current ( vout = 3.3v) ................................ ................................ ...................... 11 figure 2.11 efficiency vs. output current ( vout = 5v) ................................ ................................ ........................ 11 figure 2.12 efficiency vs. input voltage ( vout = 3.3v) ................................ ................................ ......................... 11 figure 2.13 standby current vs. input voltage ................................ ................................ ................................ ....... 12 figure 2.14 standby current vs. temperature ................................ ................................ ................................ ....... 12 figure 2.15 output voltage vs. temperature ................................ ................................ ................................ .......... 12 figure 2.16 oscillator frequency vs. temperature (iout=300ma) ................................ ................................ ......... 12 figure 2.17 quiescent current vs. temperature (no load) ................................ ................................ ................... 12 figure 2.18 input current vs. temperature (no load, no switc hing) ................................ ................................ ..... 12 figure 3.1 ZSPM4012B block diagram ................................ ................................ ................................ ................ 13 figure 3.2 monitor and control logic functionality ................................ ................................ .............................. 14 fi gure 4.1 typical application for adjustable output voltage ................................ ................................ ............... 16 figure 4.2 typical application for fixed output voltage ................................ ................................ ....................... 16 figure 5.1 ZSPM4012B package drawing ................................ ................................ ................................ ........... 17 figure 5.2 16 lead 3x3mm qfn (top view) ................................ ................................ ................................ .......... 18 list of tables table 1.1 absolute maximum ratings ................................ ................................ ................................ ................... 6 table 1.2 thermal characteristics ................................ ................................ ................................ ......................... 6 table 1.3 recommended operating conditions ................................ ................................ ................................ ... 7 table 1.4 electrical characteristics ................................ ................................ ................................ ....................... 7 table 1.5 regulat or characteristics ................................ ................................ ................................ ...................... 8 table 5.1 pin description, 16 lead, 3x3mm qfn ................................ ................................ ................................ 1 9
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 6 of 22 1 ZSPM4012B characteristics important: stresses beyond those listed under absolute maximum ratings (section 1.1 ) may cause permanent damage to the device. these are stress ratings only . f unctional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions (section 1.3 ) is not implied. exposure to absolute C ma ximum C rated conditions for extended periods may affect device reliability. 1.1. absolute maximum ratings over operating free C air temperature range unless otherwise noted . table 1 . 1 absolute maximum ratings paramete r value 1) unit voltage on vcc pin - 0.3 to 26.4 v voltage on bst pin - 0.3 to (vcc+6) v voltage on vsw pin - 1 to 26.4 v voltage on en, pg, fb pins - 0.3 to 6 v electrostatic discharge C human body model 2) +/ - 2k v electrostatic discharge C charge device model 2) +/ - 500 v lead temperature (soldering, 10 seconds) 260 ? c 1) all voltage values are with respect to network groun d terminal. 2) esd testing is performed according to the respective jesd22 jedec standard. 1.2. thermal characteristics table 1 . 2 thermal c haracteristics parameter symbol value unit thermal resistance junction to ai r 1) ? ja 38 c/w storage temperature range t stg - 65 to 150 c maximum junction temperature t j max 150 c operating junction temperature range t j - 40 to 125 c 1) assumes 1 in 2 area of 2 oz. copper and 25 ? c ambi ent temperature.
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 7 of 22 1.3. recommended operating conditions table 1 . 3 recommended o perating c onditions parameter symbol min typ max unit input operating voltage vcc 4.5 12 24 v bootstrap capacitor c bst 17.6 22 26.4 nf output filter inductor typical value 1) l out 3.76 4.7 5.64 h output filter capacitor typical value 2) c out 33 44 (2 x 22) f output filter capacitor esr c out - esr 2 35 100 m ? input supply bypass capacitor typical value 3) c bypass 8 10 f 1) for best performance, an inductor with a saturation current rating higher than the maximum v out load requirement plus the inducto r current ripple. 2) for best performance, a low esr ceramic capacitor should be used. 3) for best performance, a low esr ce ramic capacitor should be used. if c bypass is not a low esr ceramic capacitor, a 0.1f ceramic capacitor should be added in parallel to c b ypass . 1.4. electrical characteristics electrical characteristics, t j = - 40 c to 125 c, vcc = 12v (unless otherwise noted) table 1 . 4 electrical c haracteristics parameter symbol condition min typ max unit vcc supp ly voltage input supply voltage vcc 4.5 24 v quiescent current: normal mode i cc - norm vcc = 12v, i load = 0a , en ? 2.2 5.2 ma quiescent current: normal mode, non - switching i cc - noswitch vcc=12v, i load =0a, en ? 2.2 non - switching 2.3 ma quiescent cur rent: disabled mode i cc - disable vcc = 12v, en = 0v 5 10 a vcc under voltage lockout input supply under voltage threshold vcc - uv vcc increasing 4.1 4.3 4.5 v input supply under voltage threshold hysteresis vcc - uv_hyst 650 mv oscillator oscillat or frequency f osc 0.9 1 1.1 mhz
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 8 of 22 parameter symbol condition min typ max unit pg open drain output pg release timer t pg 10 m s high - level output leakage i oh - pg v pg = 5v 0.5 a low - level output voltage v ol - pg i pg = - 0.3ma 0.01 v en input voltage thresholds high level input voltage v ih - en 2.2 v low level input voltage v il - en 0.8 v input hysteresis v hyst - en 480 mv input leakage i in - en v en =5v 3.5 a v en =0v - 1.5 a thermal shutdown thermal shutdown junction temperature tsd note: guaranteed by design 150 170 c tsd hyst eresis tsd hyst 10 c 1.5. regulator characteristics electrical characteristics, t j = - 40 c to 125 c, vcc = 12v (unless otherwise noted) table 1 . 5 regulator characteristics see important table notes at the end of the table. parameter symbol condition min typ max unit switch mode regulator: l out =4.7h and c out =2 x 22f output voltage tolerance in pulse - width modulation (pwm) mode v out - pwm i load =1a v out C 2% v out v out + 2% v output voltage tolerance in pulse - frequency modulation (pfm) mode v out - pfm i load = 0a v out C 1% v out + 1% v out + 3.5% v differential voltage between v out and v cc v in - out steady state. (example, vout maximum is 3.3v with vcc min of 4.5v) 1.2 v high side switch on resistance 1) r dson i vsw = - 1a 180 m? low side switch on resistance 1) i vsw = 1a 120 m? output current i out 2 a
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 9 of 22 parameter symbol condition min typ max unit over current detect i ocd hs switch current 2 .4 2 .8 3 .4 a feedback reference (adjustable mode) fb th 0.886 0.9 0.914 v s oft start ramp time t s s 4 ms pfm mode fb comparator threshold fb th - pfm v out + 1% v v out under voltage threshold v out - uv 88% v out 90% v out 92% v out v out under voltage hysteresis v out - uv_hyst 1.5% v out v out over voltage threshold v out - ov 103% v out v out over voltage hysteresis v out - ov_hyst 1% v out max duty cycle 2) duty max 95% 97% 99% 1) r dson is characterized at 1a and tested at lower current in production. 2) regulator vsw pin is forced off for 240ns every 8 cycles to ensure the bst cap is replenished.
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 10 of 22 2 typical performance characteristics C zspm401x family graphs apply to zspm401x ics. see section 1 for ZSPM4012B characteristics. u nless otherwise noted , t j = - 40c to 125c, vcc = 12v . figure 2 . 1 startup response figure 2 . 2 100ma to 1a load step ( v cc = 12v, v out =1 . 8v) figure 2 . 3 100ma to 2a load ( v cc =12v, v out = 1 . 8v) figure 2 . 4 100ma t o 1a load step ( v cc =12v, v out = 3 . 3v) figure 2 . 5 100ma to 2a load step ( v cc =12v, v out = 3. 3v) figure 2 . 6 line transient response (vcc= 10 v to 15v , v out = 3.3v)
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 11 of 22 figure 2 . 7 load regulation figure 2 . 8 line regulation (i out =1a) figure 2 . 9 efficiency vs. output current ( v out = 1.8v) figure 2 . 10 efficiency vs. output current ( v out = 3.3v) figure 2 . 11 efficiency vs. output current ( v out = 5v) figure 2 . 12 efficiency vs. input voltage ( v out = 3.3v)
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 12 of 22 figure 2 . 13 standby current vs. input voltage figure 2 . 14 standby current vs. temperature figure 2 . 15 output voltage vs. temperature figure 2 . 16 oscillator frequency vs. temperature (iout=300ma) figure 2 . 17 quiescent current vs. temperature (no load) figure 2 . 18 inp ut current vs. temperature (no load, no switching)
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 13 of 22 3 description of circuit the ZSPM4012B current - mode synchronous step - down power supply product can be used in the commercial, industrial, and automotive market segments. it includes flexibility for a wid e range of output voltages and is optimized for high efficiency power conversion with low r dson integrated synchronous switc hes. a 1mhz internal switching frequency facilitates lo w - cost lc filter combinations. t he fixed - output versions also enable a minimu m external component count to provide a complete regulation solution with only 4 external components: an input bypass capacitor, an inductor, an output capacitor, and the bootstrap capacitor. the regulator automatically transitions between pulse frequency modulation (pfm) and pulse width modulation (pwm) mode to maximize efficiency for the load demand. see section 5.3.3 for details for adjusting v out for the adjustable output version of the zspm401 2 b. 3.1. block diag ram figure 3 . 1 provides a block diagram of the ZSPM4012B, and figure 3 . 2 illustrates its monitor and control logic functions, which are explained in section 3.2 . figure 3 . 1 ZSPM4012B block diagram v c c o v e r c u r r e n t p r o t e c t i o n g a t e d r i v e g a t e d r i v e b o o t s t r a p v o l t a g e v c c g a t e d r i v e c o n t r o l f b v s w v r e f & s o f t s t a r t o s c i l l a t o r r a m p g e n e r a t o r c o m p a r a t o r e r r o r a m p g n d u n d e r - v o l t a g e p r o t e c t i o n m o n i t o r & c o n t r o l t h e r m a l p r o t e c t i o n o v e r - v o l t a g e p r o t e c t i o n v c c f b v c c v c c b s t ? e n p g n d p g p f m m o d e c o m p a r a t o r v r e f 4 . 2 v c o m p e n s a t i o n n e t w o r k h i g h - s i d e s w i t c h l o w - s i d e s w i t c h
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 14 of 22 figure 3 . 2 monitor and control logic functionality 3.2. internal protection details 3.2.1. internal current limit the current through the high - side fet is sensed on a cycle - by - cycle basis, and if the current limit is reached, the over - current detection (ocd) circuit will abbreviate the cycle. t he device also senses the fb pin to identify hard short conditions and will direct the vsw output to skip 4 cycles if the current limit occurs when fb is low. this allows current built up in the inductor during the minimum on - time to decay sufficiently. t he c urrent limit is always active when the regulator is enabled. soft start ensures that current limit does not prevent regulator startup. an additional feature of the over - current protection circuitry is that u nder extended over - current conditions, the de vice will automat ically disable. a simple toggle of the e n e nable pin will return the device to normal operation. 3.2.2. thermal shutdown if the temperature of the die exceeds 170 c (typical), the thermal shutdown (tsd) circuit will set the vsw outputs to the tri - state level to p rotect the device from damage. the pg and all other protection circuitry will stay active to inform th e system of the failure mode. if the ZSPM4012B cools to 160 c (typical), it will attempt to start up again, following th e normal soft sta rt sequence. if the device reaches 170 c, the shutdown/restart sequence will repeat. 3.2.3. voltage reference soft - start the voltage reference in this device is ramped at a rate of 4ms to prevent the output from overshoot during startup. this ramp restarts whenev er there is a rising edge sensed on the e n pin. this occurs in both the fixed and adjustable versions. during the soft start ramp , current limit is still active and still protect s the device if the output is shorted . 3.2.4. vcc under - voltage lockout the zspm401 2 b is held in the off state until vcc reaches 4.3v (typical). see section 1.4 for the input hysteresis. t s d f i l t e r v c c - u v f i l t e r i n t e r n a l p o r f i l t e r f i l t e r e n v o u t - u v f i l t e r p g e n a b l e r e g u l a t o r v o u t - o v f i l t e r i o c d o c d _ f i l t e r t r i - s t a t e v s w o u t p u t
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 15 of 22 3.2.5. output over - v oltage protection if the output of the regulator exceeds 103% of the regulation voltage, t he ou tput over - voltage (out - ov) protection circuit will set the vsw outputs to the tri - state level to protect the ZSPM4012B from damage. (see figure 3 . 2 .) this check occurs at the start of each switching cycle. if it oc curs during the middle of a cycle, the switching for that cycle will complete and the vsw outputs will tri - state at the start of the next cycle. 3.2.6. output under - voltage monitoring the switched mode output voltage is also monitored by the output under - voltage circuit (out - uv) as shown in figure 3 . 2 . the pg line remains low until the output voltage reaches the v out - uv threshold (see table 1 . 5 ) . once the internal comparator detect s that the output voltage is above the desired threshold, an internal delay timer is activated and the pg line is de - asserted (to high) once this delay timer expires. in the event that the output voltage decreases below v out - uv , the pg line will be asserte d low and remain low until the output rises above v out - uv and the delay timer times out. there is a hysteresis for the v out - uv threshold (see table 1 . 5 ).
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 16 of 22 4 application circuits 4.1. selection of external components the i nternal compensation is optimized for a 44 f output ca pacitor (c out ) and a 4.7 h inductor (l out ) . the minimum allowable value for the output capacitor is 33 f. to keep the output ripple low, a low esr (less than 35m ? ) ceramic is recommended. the ind uctor range is 4.7 h +/ - 20%. for optimal over - current protection, the inductor should be able to handle up to the regulator current limit without saturation. connect the vcc pin to the bypass capacitor c bypass to improve performance (see section 5.3.1 and table 1 . 3 ) . connect the bst pin to the boo tstrap capacitor c bst as described in section 5.3.2 . see table 1 . 3 for the recommended value. for the adjustable version of the ZSPM4012B, an external voltage resistor divider is required (r top and r bot ). see section 5.3.3 for details. 4.2. typical application circuits figure 4 . 1 typical application for adjustable output voltage figure 4 . 2 typical application for fixed output voltage z s p m 4 0 1 2 b v o u t a d j u s t a b l e o u t p u t p g n d v s w v c c f b g n d b s t v c c p g p g r t o p r b o t 1 0 k ( o p t i o n a l ) v o u t e n e n c b y p a s s l o u t c o u t c b s t z s p m 4 0 1 2 b v o u t f i x e d o u t p u t e n p g n d v s w v c c f b g n d v c c e n p g p g 1 0 k ( o p t i o n a l ) v o u t b s t c b y p a s s c b s t c o u t l o u t
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 17 of 22 5 pin configuration and package figure 5 . 1 ZSPM4012B p ackage d rawing
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 18 of 22 5.1. marking diagram & pin - out figure 5 . 2 16 lead 3x3 mm qfn (top view) 401 2 b : part name b: revision xxxxx: lot number (last five digits) o: pin 1 mark vl: voltage level ? 15 1.5v ? 18 1.8v ? 25 2.5v ? 33 3.3v ? 50 5.0v ? 00 0.9v C 5.0v variable my: date code m = month ? 1 january ? 2 februa ry ? 3 march ? 4 april ? 5 may ? 6 june ? 7 july ? 8 august ? 9 september ? a october ? b november ? c december y = year ? a 2011 ? b 2012 ? c 2013 ? e tc.
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 19 of 22 5.2. p in description for 16 lead 3x3 mm qfn table 5 . 1 pin d escription, 16 lead, 3x3 mm qfn name pin # function description vsw 1 switching voltage node connected to a 4.7 h (typical) inductor . also connect to additional vsw pins 12, 13, and 16. vcc 2 input voltage input voltage . also connect to additional vcc pins 3 and 11. vcc 3 input v oltage input voltage . also connect to additional vcc pins 2 and 11. gnd 4 gnd primary ground for the majority of the device except the low - side power fet. fb 5 feedback input regulator fb voltage. connects to v out for fixed - mode and the output resistor divider for adjustable mode. nc 6 no connect not c onnected . nc 7 no connect not c onnected . pg 8 pg output open - drain output. en 9 enable input ab ove 2.2v the device is enabled. ground th is pin to disable the ZSPM4012B. includes internal pull - up. bst 10 bootstrap capacitor bootstrap capacitor for the high - side fet gate dri ver. connect a 22nf ceramic capacitor from bst pin to vsw pin . vcc 11 input voltage input v oltage . also connect to additional vcc pins 2 and 3. vsw 12 switching voltage node c onnect to additional vsw pins 1, 13, and 16. vsw 13 switching voltage node c onnect to additional vsw pins 1, 12, and 16. pgnd 14 power gnd gnd supply for internal low - side fet/integrated diode . also connect to additional pgnd pin 15. pgnd 15 power gnd gnd sup ply for internal low - side fet/integrated diode . also connect to additional pgnd pin 14. vsw 16 switching voltage node c onnect to additional vsw pins 1, 12, and 13.
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 20 of 22 5.3. detailed pin description 5.3.1. unregulated i nput, vcc (pins # 2, 3) this terminal is the unregu lated input voltage source for the ZSPM4012B. it is recommended that a 10 f bypass capacitor be placed close to t he device for best performance. since this is the main supply for the ZSPM4012B, good layout practices must be followed for this connection. 5.3.2. b ootstrap c ontrol, bst (pin #10) this terminal will provide the bootstrap voltage required for the high - side internal nmos switch of the buck regulator. an external ceramic capacitor placed between the bst input terminal , and the vsw pin will provide the ne cessary voltage for the high - side switch. in normal operation , the capacitor is re - charged on every low side synchronous switching action. if the switch mode approaches 100% duty cycle for the high side fet, the device will automatically reduce the duty cy cle switch to a minimum off time on every 8 th cycle to allow this capacitor to re - charge. 5.3.3. sense f eedback, fb (pin #5) this is the input terminal for the output vo ltage feedback. for the fixed - mode versions, this should be connected directly to v out . the co nnection on the pcb shou ld be kept as short as possible and should be made as close as possible to the capacitor. the trace should not be shared with any other connection. for adjustable - mode versions of the ZSPM4012B, this should be connected to the exter nal resistor divider. to choose the resistors, use the following equation: v out = 0.9 (1 + r top /r bot ) the input to the fb pin is high impedance, and input cur rent should be less than 100na. as a result, good layout practices are required for the feedback resistors and feedback traces. when using the adjustable version, the feedback trace should be kept as short and narrow as possible to reduce stray capacitance and the injection of noise. 5.3.4. switching o utput, vsw (pins #12, 13) this is the sw itching node of t he regulator. it should be connected directly to the 4.7 h inductor with a wide, short trace and to one e nd of the bootstrap capacitor. it switches between vcc and pgnd at the switching frequency. 5.3.5. ground, gnd (pin #4) this ground is used for the majority of the device including the analog reference, control loop, and other circuits. 5.3.6. power ground, pgnd (pins #14, 15) this is a separate ground connection used for the low - side synchronous switch to isolate switching noise from the rest of the device. 5.3.7. enabl e , e n (pin #9) this is the input term inal to activate the regulator. the input threshold is ttl/cmos compatible. it also has an internal pull - up to ensure a stable state if the pin is disconnected. 5.3.8. pg output, pg (pin #8) this is an open drain, active low output. see section 3.2.6 for a description of the function of this pin .
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 21 of 22 6 ordering information ordering code description package zspm4012 b a1w00 2 a synchronous buck converter: adjustable output, 0.9v to 5v, 16 - pi n 3x3mm qfn 7 reel with 1000 ics zspm4012 b a1w15 2 a synchronous buck converter: fixed output, 1.5v,16 - pin 3x3mm qfn 7 reel with 1000 ics zspm4012 b a1w18 2 a synchronous buck converter: fixed output, 1.8v,16 - pin 3x3mm qfn 7 reel with 1000 ics zspm4012 b a1 w25 2 a synchronous buck converter: fixed output, 2.5v,16 - pin 3x3mm qfn 7 reel with 1000 ics zspm4012 b a1w33 2 a synchronous buck converter: fixed output, 3.3v,16 - pin 3x3mm qfn 7 reel with 1000 ics zspm4012 b a1w50 2 a synchronous buck converter: fixed outpu t, 5.0v,16 - pin 3x3mm qfn 7 reel with 1000 ics zspm4012 b k it zspm4012 b evaluation kit for 2a synchronous buck converter kit 7 related documents document file name ZSPM4012B feature sheet zspm4012 b _feature_sheet_rev_x_xy.pdf ZSPM4012B evaluation kit desc ription zspm4012 b _12 b _13 b _eval_kit_manual__x_xy.pdf note: x_xy denotes the current revision of the document. visit zmdis website www.zmdi.com or contact your nearest sales office for the latest version of these docume nts. 8 glossary term description p wm pulse width modulation (fixed frequency). pfm pulse frequency modulation (fixed pulse width). por power - on reset esr equivalent series resistance .
ZSPM4012B high efficiency 2a synchronous buck converter data sheet april 4 , 2013 ? 201 3 zentrum mikroelektronik dresden ag rev. 1.00 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used withou t the prior written consent of the copyright owner. the information furnished in this publicatio n is subject to changes without not ice. 22 of 22 9 document revision history revision date description 1.0 0 april 2, 20 13 first release of ZSPM4012B, based on zspm4012, silicon revision a . sales and further information www.zmdi.com analog@zmdi.com zentrum mikroelektronik dresden ag global headq uarters grenzstrasse 28 01109 dresden, germany central office: phone +49.351.8822.0 fax +49.351.8822.600 zmd america, inc. 1525 mccarthy blvd., #212 milpitas, ca 95035 - 7453 usa usa phone +855.275.9634 zentrum mikroelektronik dresden ag, japan office 2nd fl oor, shinbashi tokyu bldg. 4 - 21 - 3, shinbashi, minato - ku tokyo, 105 - 0004 japan zmd far east, ltd. 3f, no. 51, sec. 2, keelung road 11052 taipei taiwan zentrum mikroelektronik dresden ag, korea office u - space 1 building 11th floor, unit ja - 1102 670 sampyeo ng - dong bundang - gu, seongnam - si gyeonggi - do, 463 - 400 korea phone +82.31.950.7679 fax +82.504.841.3026 phone +408.883.6310 fax +408.883.6358 phone +81.3.6895.7410 fax +81.3.6895.7301 phone +886.2.2377.8189 fax +886.2.2377.8199 european technical suppo rt phone +49.351.8822.7.772 fax +49.351.8822.87.772 disclaimer : this information applies to a product under development. its characteristics and specifications ar e s ubject to change without notice. zentrum mikroelek tronik dresden ag (zmd ag) assumes no ob ligation regarding future manufacture unless otherwise agreed to in writing. the information furnished hereby is believed to be true and accurate. however, under no circumstances shall zmd ag be liable to a ny customer, licensee, or any other third party fo r any special, indirect, incidental, or consequential damages of any kind or nature whatsoever arising out of or in any way related to the furnishing, performance, or use of this technical data. zmd ag hereby expressly disclaims any liabilit y of zmd ag to any customer, licensee or any other third party, and any such customer, licensee and any other third party hereby waives any liab ility of zmd ag for any damages in connection with or arising out of the furnishing, performance or use of this technical data, whether based on contract, warranty, tort (including negligence), strict liability, or otherwise. european sales (stuttgart) phone +49.711.674517.55 fax +49.711.674517.87955
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