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data sheet rev. 1.0 3 / september 2012 ZSPM4011 high efficiency 1a synchronous buck converter power and precision
ZSPM4011 high efficiency 1a synchronous buck converter ? 201 2 zentrum mikr oelektronik dresden ag rev.1.03 september 2 1 , 2012 . all rights reserved. the material c o ntained herein may not be reproduced, ada pted, 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. f or more information, c ontact zmdi via analog @zmdi.com . brief description the ZSPM4011 is a dc/dc synchronous switching regulator with fully integrated power switches, internal 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 ZSPM4011 utilizes current mode feedback in normal regulation pulse - width modulation ( pw m ) mode. when the regulator is disabled (en pin is low), the ZSPM4011 draws less than 10 a quies - cent current. the ZSPM4011 integrates a wide range of protection circuitry , including input supply under - voltage lockout, output voltage soft start, current li mit, v out over - voltage, and thermal shutdown. the ZSPM4011 includes supervisory reporting through the pg (power good) open drain output to interface o ther components in the system. features ? output voltage options depending on order code: ? fixed output volt ages: 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: 6v to 24v ? 1mhz +/ - 10% fixed switching frequency ? 1a c ontinuous output 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 startup with no overshoot ? ful l 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) ? inherent 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 ? zspm4012/ zspm4013: 2a/3a synchronous buck converters, available with adju stable out - put from 0.9 to 5v or fixed output voltages at 1.5v, 1.8v, 2.5v, 3.3v, 5.0v (16 - pin 3x3 qfn) ? zspm1000: >5a single - phase, single - rail, true digital pwm controller ( 24 - lead 4x4 mm qfn) ZSPM4011 application circuit s z s p m 4 0 1 1 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 1 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
ZSPM4011 high efficiency 1a synchronous buck converter ? 201 2 zentrum mikr oelektronik dresden ag rev.1.03 september 2 1 , 2012 . 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 c opyright owner. typical applications ? wireless access points, cable modems ? set - top boxes ? dvd, lcd, led supplies ? portable products, including gps, smart phones, tablet pcs ? printers ZSPM4011 block diagram ordering information ordering code description package ZSPM4011 aa1 w00 ZSPM4011, 1a s ynchronous b uck c onverter: adjustable output, 0. 9 v to 5v , 16 - pin 3x3mm qfn 7 reel with 1000 ics ZSPM4011aa1w1 5 ZSPM4011, 1a synchronous buck converter: fixed output, 1.5v,16 - pin 3x3mm qfn 7 reel with 1000 ics ZSPM4011aa1w18 ZSPM4011, 1a synchronous buck converter: fixed output, 1.8v,16 - pin 3x3mm qfn 7 reel with 1000 ics ZSPM4011aa1w25 ZSPM4011, 1a synchronous buck converter: fixed output, 2.5v,16 - pin 3x3mm qfn 7 reel with 1000 ics ZSPM4011aa1w33 ZSPM4011, 1a synchronous buck converter: fixed output, 3.3v,16 - pin 3x3mm qfn 7 reel with 1000 ics ZSPM4011aa1w50 ZSPM4011, 1a synchronous buck converter: fixed out put, 5.0v,16 - pin 3x3mm qfn 7 reel with 1000 ics ZSPM4011kit ZSPM4011kit, e valuation k it for 1a synchronous buck converter kit sales and further information www.zmdi.com analog@ zmdi.com zentrum mikroelektronik dresden ag grenzstrasse 28 01109 dresden germany zmd america, inc. 1525 mccarthy blvd., #212 milpitas, ca 95035 - 7453 usa zentrum mikroelektronik dresden 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, korean office posco centre building west tower, 11th floor 892 daechi, 4 - dong, kangnam - gu seoul, 135 - 777 korea phone +49 . 351.8822 .7.776 fax +49 . 351.8822 .8.7776 phone 855 - ask - zmdi (855 - 275 - 9634) phone +81.3.6895.7410 fax +81.3.6895.7301 phone +886.2.2377.8189 fax +886.2.2377.8199 phone +82.2.559.0660 fax +82.2.559.0700 disclaimer : this information applies to a pro duct under development. its characteristics and specifications are subject to change without notice. zentrum mikroelektronik dresden ag (zmd ag) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. the information furni shed hereby is believed to be true and accurate. however, under no circumstances shall zmd ag be liable to any customer, licensee, or any other third party for any special, indirect, incide ntal, or consequential damages of any kind or nature whatsoever ari sing out of or in any way related to the furnishing, performance, or use of this technical data. zmd ag hereby expressly disc laims any liability of zmd ag to any customer, licensee or any other third party, and any such customer, licensee and any other thi rd party hereby waives any liability 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. 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 v o u t ? e n p g n d p g c b s t c o u t l o u t r t o p r b o t 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
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 4 of 21 contents 1 ZSPM4011 characteristics ................................ ................................ ................................ ................................ .. 6 1.1. absolute maximum ratings ................................ ................................ ................................ .......................... 6 1.2. thermal characteristics ................................ ................................ ................................ ................................ 6 1.3. recommended operating 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. internal protection details ................................ ................................ ................................ .......................... 14 3.1.1. internal current limit ................................ ................................ ................................ ........................... 14 3.1.2. thermal shutdown ................................ ................................ ................................ ............................... 14 3.1.3. reference soft - start ................................ ................................ ................................ ............................ 14 3.1.4. output over - voltage ................................ ................................ ................................ ............................ 14 3.1.5. vcc under - voltage lockout ................................ ................................ ................................ ................ 14 4 application circuits ................................ ................................ ................................ ................................ ............ 15 4.1. selection of external components ................................ ................................ ................................ ............. 15 4.2. typical application circuits ................................ ................................ ................................ ......................... 15 5 pin configuration and package ................................ ................................ ................................ ......................... 16 5.1. marking diagram & pin - out ................................ ................................ ................................ ........................ 17 5.2. pin description for 16 lead 3x3 qfn ................................ ................................ ................................ ....... 18 5 .3. detailed pin description ................................ ................................ ................................ ............................. 19 5.3.1. unregulated input, vcc (pins # 2, 3) ................................ ................................ ................................ .. 19 5.3.2. bootstrap control, bst (pin #10) ................................ ................................ ................................ ........ 19 5.3.3. sense feedback, fb (pin #5) ................................ ................................ ................................ .............. 19 5.3.4. switching output, vsw (pins #12, 13) ................................ ................................ ................................ 19 5.3.5. ground, gnd (pin #4) ................................ ................................ ................................ ......................... 19 5.3.6. power ground, pgnd (pins #14, 15) ................................ ................................ ................................ .. 19 5.3.7. enable, high - voltage, en (pin # 9) ................................ ................................ ................................ ...... 19 5.3.8. pg output, pg (pin #8) ................................ ................................ ................................ ....................... 19 6 ordering information ................................ ................................ ................................ ................................ ......... 20 7 related documents ................................ ................................ ................................ ................................ ........... 20 8 glossary ................................ ................................ ................................ ................................ ............................ 20 9 document revision history ................................ ................................ ................................ ............................... 21
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 5 of 21 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 figure 2.4 100ma t0 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 (iout=1a) ................................ ................................ ................................ ................. 11 figure 2.9 efficiency vs. output current ( v out = 1.8v) ................................ ................................ ........................ 11 figure 2.10 efficiency vs. output current ( v out = 3.3v) ................................ ................................ ........................ 11 figure 2.11 efficiency vs. output current ( v out = 5v) ................................ ................................ ........................... 11 figure 2.12 efficiency vs. input voltage (v out = 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 switching) ................................ ................................ ..... 12 figure 3.1 ZSPM4011 block diagram ................................ ................................ ................................ .................. 13 figure 3.2 monitor and control l ogic functionality ................................ ................................ .............................. 14 figure 4.1 typical application for adjustable output voltage ................................ ................................ ............... 15 figure 4.2 typical application for fixed o utput voltage ................................ ................................ ....................... 15 figure 5.1 ZSPM4011 package drawing ................................ ................................ ................................ .............. 16 figure 5.2 16 lead 3x3mm qfn (top view) ................................ ................................ ................................ .......... 17 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 5.1 pin descriptio n, 16 lead, 3x3mm qfn ................................ ................................ ................................ 18
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 6 of 21 1 ZSPM4011 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, and functional 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 a bsolute C maximum 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 rating s parameter 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 mo del 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 net work ground 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 junc tion to air 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 ambient temperature.
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 7 of 21 1.3. recommended operating conditions table 1 . 3 recommended o perating c onditions parameter symbol min typ max unit input operating voltage vcc 6 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 e sr 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 inductor 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 parall el to c bypass . 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 supply voltage input supply voltage vcc 6 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 quiesce nt current: 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 5.5 5.75 6.0 v input supply under voltage threshold hysteresis vcc - uv_hyst 650 mv oscillator o scillator frequency f osc 0.9 1 1.1 mhz
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 8 of 21 parameter symbol condition min typ max unit pg open drain output pg release timer t pg 10 ms 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 t sd hysteresis tsd hyst 10 c 1.5. regulator characteristics electrical characteristics, t j = - 40 c to 125 c, vcc = 12v (unless otherwise noted) parameter symbol condition min typ max unit switch mode regulator: l=4.7h and c=2 x 22f output voltage toler ance in pwm mode v out - pwm i load =1a v out C 2% v out v out + 2% v output voltage tolerance in pfm mode v out - pfm i load = 0a v out C 1% v out + 1% v out + 3.5% v high side switch on resistance r dson i vsw = - 1a (see table note 1) 180 m? low side switch on resistance i vsw = 1a (see table note 1) 120 m? output current i out 1 a over current detect i ocd hs switch current 1.4 1.8 2.4 a feedback reference (adjustab le mode) fb th 0.886 0.9 0.914 v feedback reference tolerance fb th - tol - 1.5 1.5 % soft start ramp time t ss 4 ms pfm mode fb comparator threshold fb th - pfm v out + 1% v
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 9 of 21 parameter symbol condition min typ max unit v out under voltage threshold v out - uv 91% v out 93% v out 95% v out v out unde r 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 duty max (see table note 2) 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.
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 10 of 21 2 typical performance characteristics C zspm401x family graphs apply to zspm401x ics. see section 1 for ZSPM4011 characteristics. u nless otherwise noted , t j = - 40 c to 125 c, vcc = 12v . figure 2 . 1 startup response figure 2 . 2 100ma to 1a load step (vcc= 12v, vout =1 . 8v) figure 2 . 3 100ma to 2a load (vcc=12v, vout = 1 . 8v) figure 2 . 4 100ma t0 1a load step (vcc=12v, vout = 3 . 3v) figure 2 . 5 100ma to 2a load step (vcc=12v, vout = 3.3v) figure 2 . 6 line transient response (vcc=10v to 15v, vout = 3.3v)
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 11 of 21 figure 2 . 7 load regulation figure 2 . 8 line regulation (iout=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)
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 12 of 21 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 qui escent current vs. temperature (no load) figure 2 . 18 input current vs. temperature (no load, no switching)
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 13 of 21 3 description of circuit the ZSPM4011 current - mode synchronous step - down power supply product ca n be used in the commercial, industrial, and automotive market segments. it includes flexibility for a wide range of output voltages and is optimized for high efficiency power conversion with low r dson integrated synchronous switc hes. a 1mhz internal switc hing frequency facilitates lo w - cost lc filter combinations. additionally, the fixed - output versions enable a minimum 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 pfm and pwm mode to maximize efficiency for the load demand. figure 3 . 1 ZSPM4011 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 v o u t ? e n p g n d p g c b s t c o u t l o u t r t o p r b o t 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
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 14 of 21 figure 3 . 2 monitor and control logic functionality 3.1. internal protection details 3.1.1. internal current limit the current through the high side fet is sensed on a cy cle - by - cycle basis , and if the current limit is reached, it will abbreviate the cycle. in addition, the device 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. t his allows current built up in the inductor during the minimum on time to decay sufficiently. the 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 device will automat ically disable. a simple toggle of the e n e nable pin will return the device to normal operation. 3.1.2. thermal shutdown if the temperature of the die exceeds 170 c (typical), the vsw outputs will tri - state 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. once the ZSPM4011 cools to 160 c (typical), the device will atte mpt to start up again, following th e normal soft start sequence. if the device reaches 170 c, the shutdown/restart sequence will repeat. 3.1.3. reference soft - start the reference in this device is ramped at a rate of 4ms to prevent the output from overshoot durin g startup. this ramp restarts whenever 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 . 3.1.4. ou tput over - v oltage if the output of the regulator exceeds 103% of the regulation voltage, the vsw outputs will tri - state to pr otect the ZSPM4011 from damage. this check occurs at the start of each switching cycle. if it occurs 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. 3.1.5. vcc under - v oltage lockout the ZSPM4011 is held in the off state unti l vcc reaches 5.75v (typical). there is hysteresis on this input (see section 1.4 ) . 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
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 15 of 21 4 application circuits 4.1. selection of external components the internal compensation is optimized for a 44 f output ca pacitor and a 4.7 h inductor. 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 ) . see table 1 . 3 for the recommended value. connect the bst pin to the boo tstrap cap acitor c bst as described in section 5.3.2 . see table 1 . 3 for the recommended value. 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 1 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 1 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
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 16 of 21 5 pin configuration and package figur e 5 . 1 ZSPM4011 p ackage d rawing
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 17 of 21 5.1. marking diagram & pin - out figure 5 . 2 16 lead 3x3 mm qfn (top view) 401 1 : part name a: 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 february ? 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 ? etc.
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 18 of 21 5.2. p in description for 16 lead 3x3 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 voltage input voltage . also connect to additional vcc pins 2 and 11. gnd 4 gnd primary ground for the majo rity 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 outp ut open - drain output. en 9 enable input ab ove 2.2v the device is enabled. ground th is pin to disable the ZSPM4011. includes internal pull - up. bst 10 bootstrap capacitor bootstrap capacitor for the high - side fet gate dri ver. connect a 22nf ceramic capaci tor 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 connected to 4.7 h (typical) inductor . also connect to additional vsw pins 1, 13, and 16. vsw 13 switching voltag e node connected to 4.7 h (typical) inductor . also connect 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 supply for internal lo w - side fet/integrated diode . also connect to additional pgnd pin 14. vsw 16 switching voltage node connected to 4.7 h (typical) inductor . also connect to additional vsw pins 1, 12, and 13.
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 19 of 2 1 5.3. detailed pin description 5.3.1. unregulated i nput, vcc (pins # 2, 3) th is terminal is the unregulated input voltage source for the ZSPM4011. 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 ZSPM4011 , good layout practices must be followed for this connection. 5.3.2. bootstrap c ontrol, bst (pin #10) this terminal will provide the bootstrap voltage required for the upper internal nmos switch of the buck regulator. an external ceramic capacitor placed between the bst input terminal , and the vsw pin will provide the necessary voltage for the upper 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 red uce the duty cycle 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 connection 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 ZSPM4011 , this should be connecte d to the external 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 itc hing node of the 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 is switching between vcc and pgnd at the switching frequency. 5.3.5. ground, gnd (pin #4) this ground is use d 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. enable, h igh - v oltage, en (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) th is is an open drain, active low output. the switched mode output voltage is monitored , and the pg line will remain low until the output voltage reaches the v out - uv threshold. once the internal comparator detects 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 asserted low and remain low until the output rises ab ove v out - uv and the delay timer times out. ( see figure 3 . 2 .)
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 20 of 21 6 ordering information ordering code description package ZSPM4011aa1w00 ZSPM4011, 1a synchronous buck converter: adjustable output, 0.9v to 5v, 16 - pin 3 x3mm qfn 7 reel with 1000 ics ZSPM4011aa1w15 ZSPM4011, 1a synchronous buck converter: fixed output, 1.5v,16 - pin 3x3mm qfn 7 reel with 1000 ics ZSPM4011aa1w18 ZSPM4011, 1a synchronous buck converter: fixed output, 1.8v,16 - pin 3x3mm qfn 7 reel with 1000 ics ZSPM4011aa1w25 ZSPM4011, 1a synchronous buck converter: fixed output, 2.5v,16 - pin 3x3mm qfn 7 reel with 1000 ics ZSPM4011aa1w33 ZSPM4011, 1a synchronous buck converter: fixed output, 3.3v,16 - pin 3x3mm qfn 7 reel with 1000 ics ZSPM4011aa1w50 zspm4 011, 1a synchronous buck converter: fixed output, 5.0v,16 - pin 3x3mm qfn 7 reel with 1000 ics ZSPM4011kit ZSPM4011kit, evaluation kit for 1a synchronous buck converter kit 7 related documents document file name ZSPM4011 feature sheet ZSPM4011_feature_sh eet_rev_x_xy.pdf ZSPM4011 evaluation kit description ZSPM4011_12_13_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 of fice for the latest version of these documents. 8 glossary term description buck converter step - down converter; converts a higher dc input voltage to a lower dc output voltage with high efficiency . synchronous r ectification a technique for improving the ef ficiency of rectification by replacing diodes with actively - controlled switches , such as transistors . pwm pulse w idth m odulation (fixed frequency) . pfm pulse f requency m odulation (fixed pulse width) . esr equivalent s eries r esistance . bootstrap c ontrol when using a n n - channel power mosfet transistor a s a high - side switch for the converter switching output, a gate voltage higher than the supply voltage is needed to turn the transistor fully on. for this purpose, a charge pump circuit, called the bootstrap control , is implemented to provide this high sup ply voltage for the high - side power mosfet driver block.
ZSPM4011 high efficiency 1a synchronous buck converter data sheet september 2 1 , 20 12 ? 201 2 zentrum mikroelektronik dresden ag rev. 1.03 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 notice. 21 of 21 9 document revision history revision date description 1.0 0 2 3 - jan - 2012 first release. 1.01 26 - jan - 20 12 revision to delete note under table 1 . 2 . 1.02 17 - se p - 2012 correction of application circuits. pg can only be connected to vout through the optional resistor. 1.03 2 1 - sep - 2012 table 1 . 1 removed reference to dissipation table. added instructions to connect duplic ate pins in the pin description table. revised block diagram graphic for block titled under and over voltage protection to read over - voltage protection. removed reference to the r code in the part - ordering table in section 6 . this option is not available. revised reference to figure 2 in section 5.3. 8 to refer to figure 3 . 2 . sales and further information www.zmdi.com analog@zmdi.com zentrum mikroelektronik dresden ag grenzstrasse 28 01109 dresden germany zmd america, inc. 1525 mccarthy blvd., #212 milpitas, ca 95035 - 7453 usa zentrum mikroelektr onik dresden 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, korean office posco centre buildi ng west tower, 11th floor 892 daechi, 4 - dong, kangnam - gu seoul, 135 - 777 korea phone +49.351.8822.7.776 fax +49.351.8822 .8.7776 phone 855 - ask - zmdi (855 - 275 - 9634) phone +81.3.6895.7410 fax +81.3.6895.7301 phone +886.2.2377.8189 fax +886.2.2377.8199 phone +82.2.559.0660 fax +82.2.559.0700 disclaimer : this information applies to a product under development. its characteristics and specifications are subject to change without notice. zentrum mikroelektronik dresden ag (zmd ag) assumes no obligation regardin g future manufacture unless otherwise agreed to in writing. the information furnished hereby is believed to be true and accur ate. however, under no circumstances shall zmd ag be liable to any customer, licensee, or any other third party for any special, in direct, 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 d isclaims any liability of zmd ag to any customer, lic ensee or any other third party, and any such customer, licensee and any other third party hereby waives any liability of zmd ag for an y 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.
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