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high efficiency 1a synchronous buck converter zspm4011b datasheet ? 2016 integrated device technology, inc. 1 january 27, 2016 brief description the zspm4011b 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 zspm4011b utilizes current mode feedback in normal regulation pulse - width modulation ( pwm ) mode. when the regulator is disabled (en p in is low), the zspm4011b draws less than 10 a quies - cent current. the zspm4011b integrates a wide range of protection circuitry , including input supply under - voltage lockout, output voltage soft start, current limit, v out over - voltage, and thermal shutdow n. the zspm4011b 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 5 .5 v with +/ - 1.5% reference ? wide input voltage range: 4.5 v to 24v ? 1mhz +/ - 10% fixed switching frequency ? 1a c ontinuous output current ? high efficiency ? 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 ? 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) ? inherent fault protection and reporting availa ble support ? evaluation k it ? d ocumentation physical characteristics ? junction operating temperature - 40 c to 125 c ? packaged in a 16pin qfn (3x3 mm) related idt products ? zspm4012 b / zspm4013 b : 2a/3a synchronous buck converters, available with adjustable out - put from 0.9 to 5 .5 v 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) zspm4011b application circuit s zspm4011b vout adjustable output pgnd vsw vcc fb gnd bst vcc pg pg r top r bot 10 k (optional ) vout en en c bypass l out c out c bst zspm 4 011 b vout fixed output en pgnd vsw vcc fb gnd vcc en pg pg 10 k ( optional ) vout bst c bypass c bst c out l out
high efficiency 1a synchronous buck converter zspm4011b datasheet ? 2016 integrated device technology, inc. 2 january 27, 2016 typical applications ? wireless access points, cable modems ? set - top boxes ? dvd, lcd, led supplies ? portable products, including gps, smart phones, tablet pcs ? printers vcc over current protection gate drive gate drive bootstrap voltage vcc gate drive control fb vsw vref & soft start oscillator ramp generator comparator error amp gnd under - voltage protection monitor & control thermal protection over - voltage protection vcc fb vcc vcc bst s en pgnd pg pfm mode comparator vref 4 . 2 v compensation network high - side switch low - side switch zspm4011b block diagram ordering information ordering code description package zspm4011b a1 w00 1a s ynchronous b uck c onverter: adjustable output, 0. 9 v to 5 .5 v , 16 - pin 3x3mm qfn 7? reel with 1000 ics zspm4011b a1w15 1a synchronous buck converter: fixed output, 1.5v,16 - pin 3x3mm qfn 7? reel with 1000 ics zspm4011b a1w18 1a synchronous buck converter: fixed output, 1.8v,16 - pin 3x3mm qfn 7? reel with 1000 ics zspm4011b a1w25 1a synchronous buck converter: fixed output, 2.5v,16 - pin 3x3mm qfn 7? reel with 1000 ics zspm4011b a1w33 1a synchronous buck converter: fixed output, 3.3v,16 - pin 3x3mm qfn 7? reel with 1000 ics zspm4011b a1w50 1a synchronous buck converter: fixed output, 5.0v,16 - pin 3x3mm qfn 7? reel with 1000 ics zspm4011b kit zspm4011b kit, e valuation k it for 1a synchronous buck converter kit corporate headquarters 6024 silver creek valley road san jose, ca 95138 www.idt.com sales 1- 800- 345- 7015 or 408 - 284- 8200 fax: 408 - 284- 2775 www.idt.com/go/sales tech support ww w.idt.com/go/support disclaimer integrated device technology, inc. (idt) reserves the right to modify the products and/or specifications described herein at any time, without notice, at idt's sole discretion. performance specifications and operating parameters of the described products are determined in an independent state and are not guaranteed to perform the same way wh en installed in customer products. the information contained herein is provided without representation or warranty of any kind, whe ther express or implied, including, but not limited to, the suitability of idt's products for any particular purpose, an implied warranty of merchantability, or non - infringement of the intellectual property rights of others. this document is presented only as a guide and does not convey any license under intellectual property rights of idt or any third parties. idt's products are not intended for use in applications involving extreme environmental conditions or in life support systems or similar devices where the failure or malfunction of an idt product can be reasonably expected to significantly affect the health or safety of users. anyone using an idt product in such a manner does so at their own risk, absent an express, written agreement by idt. integ rated device technology, idt and the idt logo are trademarks or registered trademarks of idt and its subsidiaries in the unit ed states and other countries. other trademarks used herein are the property of idt or their respective third party owners. for dat asheet type definitions and a glossary of common terms, visit www.idt.com/go/glossary . all contents of this document are copyright of integrated device technology, inc. all rights reserved.
zspm4011b datasheet ? 2016 integrated device technology, inc. 3 january 27, 2016 contents 1 zspm4011b characteristics ............................................................................................................................... 5 1.1. absolute maximum ratings .......................................................................................................................... 5 1.2. thermal characteristics ................................................................................................................................ 5 1.3. recommended operating conditions .......................................................................................................... 6 1.4. electrical characteristics .............................................................................................................................. 6 1.5. regulator characteristics ............................................................................................................................. 7 2 typical performance characteristics ? zspm401x family ................................................................................. 9 3 description of circuit ......................................................................................................................................... 12 3.1. block diagram ............................................................................................................................................ 12 3.2. internal protection details .......................................................................................................................... 13 3.2.1. internal current limit ........................................................................................................................... 13 3.2.2. thermal shutdown ............................................................................................................................... 13 3.2. 3. voltage reference soft - start ............................................................................................................... 13 3.2.4. vcc under - voltage lockout ................................................................................................................ 13 3.2.5. output over - voltage protection ........................................................................................................... 14 3.2.6. output under - voltage monitoring ........................................................................................................ 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. package dimensions .................................................................................................................................. 16 5.2. marking diagram & pin - out ........................................................................................................................ 17 5.3. pin description for 16 lead 3x3 qfn ....................................................................................................... 18 5.4. detailed pin description ............................................................................................................................. 19 5.4.1. unregulated input, vcc (pins # 2, 3) .................................................................................................. 19 5.4.2. bootstrap control, bst (pin #10) ........................................................................................................ 19 5.4.3. sense feedback, fb (pin #5) .............................................................................................................. 19 5.4.4. switching output, vsw (pins #12, 13) ................................................................................................ 19 5.4.5. ground, gnd (pin #4) ......................................................................................................................... 19 5.4.6. power ground, pgnd (pins #14, 15) .................................................................................................. 19 5.4.7. enable, en (pin #9) ............................................................................................................................. 19 5.4.8. pg output, pg (pin #8) ....................................................................................................................... 19 6 ordering information ......................................................................................................................................... 20 7 related documents ........................................................................................................................................... 20 8 glossary ............................................................................................................................................................ 20 9 document revision history ............................................................................................................................... 21
zspm4011b datasheet ? 2016 integrated device technology, inc. 4 january 27, 2016 list of figures figure 2.1 startup response .................................................................................................................................. 9 figure 2.2 100ma to 1a load step (vcc= 12v, vout =1.8v) ............................................................................. 9 figure 2.3 100ma to 2a load (vcc=12v, vout = 1.8v) ...................................................................................... 9 figure 2.4 100ma t0 1a load step (vcc=12v, vout = 3.3v) ............................................................................. 9 figure 2.5 100ma to 2a load step (vcc=12v, vout = 3.3v) ............................................................................. 9 figure 2.6 line transient response (vcc=10v to 15v, vout = 3.3v) ................................................................ 9 figure 2.7 load regulation ................................................................................................................................... 10 figure 2.8 line regulation (i out =1a) .................................................................................................................... 10 figure 2.9 efficiency vs. output current ( v out = 1.8v) ..................................................................................... 10 figure 2.10 efficiency vs. output current ( v out = 3.3v) ..................................................................................... 10 figure 2.11 efficiency vs. output current (v out = 5v) .......................................................................................... 10 figure 2.12 efficiency vs. input voltage (v out = 3.3v) ......................................................................................... 10 figure 2.13 standby current vs. input voltage ....................................................................................................... 11 figure 2.14 standby current vs. temperature ....................................................................................................... 11 figure 2.15 output voltage vs. temperature .......................................................................................................... 11 figure 2.16 oscillator frequency vs. temperature (iout=300ma) ......................................................................... 11 figure 2.17 quiescent current vs. temperature (no load) .................................................................................... 11 figure 2.18 input current vs. temper ature (no load, no switching) ..................................................................... 11 figure 3.1 zspm4011b block diagram ................................................................................................................ 12 figure 3.2 monitor and control logic functionality .............................................................................................. 13 figure 4.1 typical application for adjustable output voltage ............................................................................... 15 figure 4.2 typical application for fixed output voltage ....................................................................................... 15 figure 5.1 zspm4011b package drawing ........................................................................................................... 16 figure 5.2 16 lead 3x3mm qfn (top view) .......................................................................................................... 17 list of tables table 1.1 absolute maximum ratings ................................................................................................................... 5 table 1.2 thermal characteristics ......................................................................................................................... 5 table 1.3 recommended operating conditions ................................................................................................... 6 table 1.4 electrical characteristics ....................................................................................................................... 6 table 1.5 regulator characteristics ...................................................................................................................... 7 table 5.1 pin description, 16 lead, 3x3mm qfn ................................................................................................ 18
zspm4011b datasheet ? 2016 integrated device technology, inc. 5 january 27, 2016 1 zspm4011b characteristics important: stresses beyond those listed under ?absolute maximum ratings? (section 1.1 ) may cause permanent damage to the device. these are stress r atings 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 absolute ? maximum ? rated conditions for extended periods may affect device reliability. 1.1. absolute maximum ratings over operating free ? air temperature range unless otherwise noted . table 1 . 1 absolute maximum ratings 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 ? human body model 2) +/ -2k v electrostatic discharge ? charge device model 2) +/ -500 v lead temperature (soldering, 10 seconds) 260 c 1) all voltage values are with respect to network 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 junction to air 1) ja 34.5 c/w thermal resistance junction to case 1) jc 2.5 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.
zspm4011b datasheet ? 2016 integrated device technology, inc. 6 january 27, 2016 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 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 parallel to c bypass . 1.4. electrical cha racteristics 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 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 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 4.1 4.3 4.5 v input supply under voltage threshold hysteresis vcc - uv_hyst 300 325 350 mv oscillator oscillator frequency f osc 0.9 1 1.1 mhz
zspm4011b datasheet ? 2016 integrated device technology, inc. 7 january 27, 2016 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 hysteresis 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=4.7h and c=2 x 22f output voltage tolerance in pulse - width modulation (pwm) mode v out - pwm i load =1a v out ? 2% v out v out + 2% v output voltage tolerance in pulse - frequency modulation (pfm) mode v out - pfm i load = 0a v out ? 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 1 a over current detect i ocd hs switch current 1.4 1.8 2.4 a
zspm4011b datasheet ? 2016 integrated device technology, inc. 8 january 27, 2016 parameter symbol condition min typ max unit feedback reference (adjustable mode) fb th 0.886 0.9 0.914 v soft start ramp time t ss 4 ms pfm mode fb comparator tolerance fb th - tol for the adjustable version, the ratio of vcc/vout cannot exceed 16 - 1.5 1.5 % 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 1) 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.
zspm4011b datasheet ? 2016 integrated device technology, inc. 9 january 27, 2016 2 typical performance characteristics ? zspm401x family graphs apply to zspm401x ics. see section 1 for zspm4011b characteristics. unless 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 (v cc =12v, v out = 1 . 8v) figure 2 . 4 100ma t0 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=10v to 15v, v out = 3.3v)
zspm4011b datasheet ? 2016 integrated device technology, inc. 10 january 27, 2016 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. out put current ( v out = 5v) figure 2 . 12 efficiency vs. input voltage (v out = 3.3v)
zspm4011b datasheet ? 2016 integrated device technology, inc. 11 january 27, 2016 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 quiescen t current vs. temperature (no load) figure 2 . 18 input current vs. temperature (no load, no switching)
zspm4011b datasheet ? 2016 integrated device technology, inc. 12 january 27, 2016 3 description of circuit the zspm4011b current - mode synchronous step - down power supply product can 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 switching frequency facilitates lo w - cost lc filter combinations. t he fixed - ou tput versions also 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 tr ansitions between pulse frequency modulation (pfm) and pulse width modulation (pwm) mode to maximize efficiency for the load demand. see section 5.4.3 for details for adjusting v out for the adjustable output version of the zspm4011b. 3.1. block diagram figure 3 . 1 provides a block diagram of the zspm4 01 1 b, and figure 3 . 2 illustrates its monitor and control logic functions, which are explained in section 3.2 . figure 3 . 1 zspm4011b block diagram vcc over current protection gate drive gate drive bootstrap voltage vcc gate drive control fb vsw vref & soft start oscillator ramp generator comparator error amp gnd under-voltage protection monitor & control thermal protection over-voltage protection vcc fb vcc vcc bst s en pgnd pg pfm mode comparator vref 4.2v compensation network high-side switch low-side switch
zspm4011b datasheet ? 2016 integrated device technology, inc. 13 january 27, 2016 figure 3 . 2 monitor and control logic functionality tsd filter v cc-uv filter internal por filter filter en v out- uv filter pg enable regulator v out-ov filter i ocd ocd_filter tri-state vsw output 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. the c urrent limi t 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 autom at 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 170c (typical), the thermal shutdown (tsd) circuit will set the vsw outputs to the tri - state level to protect 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 zspm4011b cools to 160 c (typical), it will attempt to start up again, following th e normal soft start 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 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 . 3.2.4. vcc under - vol tage lockout the zspm4011b is held in the off state until vcc reaches 4.3v (typical). see section 1.4 for the input hysteresis.
zspm4011b datasheet ? 2016 integrated device technology, inc. 14 january 27, 2016 3.2.5. output over - v oltage protection if the output of the regulator exceeds 103% of the regulation voltage, the output over - voltage (out - ov) protection circuit will set the vsw outputs to the tri - state level to protect the zspm4011b from damage. (see figure 3 . 2 .) 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. 3.2.6. 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 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 decr eases below v out-uv , the pg line will be asserted 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 .
zspm4011b datasheet ? 2016 integrated device technology, inc. 15 january 27, 2016 4 application circuits 4.1. selection of external components the internal 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 sa turation. connect the vcc pin to the bypass capacitor c bypass to improve performance (see section 5.4.1 ) . see table 1 . 3 for the recommended value. connect the bst pin to the boo tstrap capacitor c bst as described in section 5.4.2 . see table 1 . 3 for the recommended value. for the adjustable version of the zspm4011b, an external voltage resistor divider is required (r top and r bot ). see section 5.4.3 for details. 4.2. typical application circuits figure 4 . 1 typical application for adjustable output voltage zspm 4 011 b vout adjustable output pgnd vsw vcc fb gnd bst vcc pg pg r top r bot 10 k ( optional ) vout en en c bypass l out c out c bst figure 4 . 2 typical application for fixed output voltage zspm4011b vout fixed output en pgnd vsw vcc fb gnd vcc en pg pg 10k (optional) vout bst c bypass c bst c out l out
zspm4011b datasheet ? 2016 integrated device technology, inc. 16 january 27, 2016 5 pin configuration and package 5.1. package dimensions figure 5 . 1 zspm4011b p ackage d rawing
zspm4011b datasheet ? 2016 integrated device technology, inc. 17 january 27, 2016 5.2. marking diagram & pin - out figure 5 . 2 16 lead 3x3 mm qfn (top view) 4011b: 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 ? 5.5 v 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.
zspm4011b datasheet ? 2016 integrated device technology, inc. 18 january 27, 2016 5.3. 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 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 zspm4011b . includes internal pull - up. bst 10 bootstrap capacitor bootstrap capacitor for the high - side fet gate dri ver. c onnect 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 supply 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.
zspm4011b datasheet ? 2016 integrated device technology, inc. 19 january 27, 2016 5.4. detailed pin description 5.4.1. unregulated i nput, vcc (pins # 2, 3) this terminal is the unregulated input voltage source for the zspm4011b . 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 zspm4011b , good layout practices must be followed for this connection. 5.4.2. bootstrap c ontrol, bst (pin #10) this terminal will provide the bootstrap vo ltage 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 necessary voltage for the high - side switch. in normal operation , the capacito r 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 cycle switch to a minimum off time on every 8 th cycle to allow this capacitor to re - charge. 5.4.3. 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 zspm4011b , this should be connected 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. 5.4.4. sw itching o utput, vsw (pins #12, 13) this is the sw itching 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 switches between vcc and pgnd at the switching freq uency. 5.4.5. ground, gnd (pin #4) this ground is used for the majority of the device including the analog reference, control loop, and other circuits. 5.4.6. power ground, pgnd (pins #14, 15) this is a separate ground connection used for the low - side synchronous sw itch to isolate switching noise from the rest of the device. 5.4.7. enable, 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 discon nected. 5.4.8. 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.
zspm4011b datasheet ? 2016 integrated device technology, inc. 20 january 27, 2016 6 ordering information ordering code description package zspm4011ba1w00 1a synchronous buck converter: adjustable output, 0.9v to 5 .5 v, 16- pin 3x3mm qfn 7? reel with 1000 ics zspm4011ba1w15 1a synchronous buck converter: fixed output, 1.5v,16 - pin 3x3mm qfn 7? reel with 1000 ics ZSPM4011BA1W18 1a synchronous buck converter: fixed output, 1.8v,16 - pin 3x3mm qfn 7? reel with 1000 ics zspm4011ba1w25 1a synchronous buck converter: fixed output, 2.5v,16 - pin 3x3mm qfn 7? reel with 1000 ics zspm4011ba1w33 1a synchron ous buck converter: fixed output, 3.3v,16 - pin 3x3mm qfn 7? reel with 1000 ics zspm4011ba1w50 1a synchronous buck converter: fixed output, 5.0v,16 - pin 3x3mm qfn 7? reel with 1000 ics zspm4011bkit zspm4011bkit, evaluation kit for 1a synchronous buck converter kit 7 related documents document zspm4011b feature sheet zspm4011b evaluation kit description visit idt ?s website www. idt .com or contact your nearest sales office for the latest version of these documents. 8 glossary term description pwm pulse w idth m odulation (fixed frequency) . pfm pulse f requency m odulation (fixed pulse width) . por power - on reset esr equivalent s eries r esistance .
zspm4011b datasheet ? 2016 integrated device technology, inc. 21 january 27, 2016 9 document revision history revision date description 1.0 0 april 4 , 2013 first release of zspm4011bb, based on zspm4011b, silicon revision a . 1.1 0 june 21, 2013 update to allow for 5.5v output voltage, new transient response graph, addi tion of thermal parameter for ? thermal resistance junction to case ( jc ) ? specification, and revision of ? thermal resistance junction to ambient ( ja ) ? specification. 1.20 february 13, 2014 revision of specifications for ?input supply under vol tage threshold hysteresis? in table 1 . 4 . january 2 7 , 2016 changed to idt branding. corporate headquarters 6024 silver creek valley road san jose, ca 95138 www.idt.com sales 1- 800- 345- 7015 or 408 - 284- 8200 fax: 408 - 284- 2775 www.idt.com/go/sales tech support www.idt.com/go/support disclaimer integrated device technology, inc. (idt) reserves the right to modify the products and/or specifications described herein at any time, without notice, at idt's sole d iscretion. performance specifications and operating parameters of the described products are determined in an independent state and are not guaranteed to perform the same way when installed in customer products. the information contained herein is provided without representation or warranty of any kind, whether express or implied, includin g, but not limited to, the suitability of idt' s products for any particular purpose, an implied warranty of merchantability, or non - infringement of the intellectual property rights of others. this document is presented only as a guide and does not convey an y license under intellectual property rights of idt or any third parties. idt's products are not intended for use in applications involving extreme environmental conditions or in life support systems or similar devices where the failure or malfunction of an idt product can be reasonably expected to significantly affect the health or safety of users. anyone using an idt product in such a manner does so at their own risk, a bsent an express, written agreement by idt. integrated device technology, idt and the idt logo are trademarks or registered tradem arks of idt and its subsidiaries in the united states and other countries. other trademarks used herein are the property of idt or their respective third party owners. for datasheet type definitions and a glossary of common terms, visit www.idt.com/go/glossary . all contents of this document are copyright of integrated device technology, inc. all rights reserved.

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