EV8764GLE-L-00A high efficiency, 12a, 18v synchronous step-down converter evaluation board EV8764GLE-L-00A rev.1.0 www.monolithicpower.com 1 6/16/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. the future of analog ic technology description the EV8764GLE-L-00A is an evaluation board for the mp8764gle, a high efficiency monolithic synchronous step-down converter. the ev board can deliver 12a continuous load current over a wide 4.5v to 18v operating input range. high efficiency can be achieved over a wide output current load range. constant-on-time (cot) control mode provides fast transient response and eases loop stabilization. this ev board can be turned on or shut down via a remote on/off input that is referenced to ground. this input is compatible with popular logic devices. electrical specification paramete r symbol v alue units input voltage v in 4.5 ? 18 v output voltage v out 3 v output current i out 12 a features ? wide 4.5v to 18v operating input range ? 12a output current ? low r ds (on) internal power mosfets ? proprietary switching loss reduction technique ? adaptive cot for ultrafast transient response ? programmable soft start time ? pre-bias start up ? programmable switching frequency from 200khz to 1mhz ? latch-off scp, and non-latch ovp protection and thermal shutdown ? output adjustable from 0.611v to 13v ? available in a qfn3x4 package applications ? set-top boxes ? xdsl modem/dslam ? samll-cell base stations ? personal video recorders ? flat panel television and monitors ? distributed power systems a ll mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under products, quality assurance page. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. EV8764GLE-L-00A evaluation board (l x w x h)85.5 mm x 85.5mm x 1.6 mm) board numbe r mps ic numbe r EV8764GLE-L-00A mp8764gle output current(a) efficiency vs. output current @500khz, v out =3v 50 60 70 80 90 100 0.01 0.1 1 10 100 v in =18v v in =12v v in =8v
EV8764GLE-L-00A ? 12a, 18v synchronous step-down converter ev board EV8764GLE-L-00A rev.1.0 www.monolithicpower.com 2 6/16/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evaluation board schematic ns c7 c1b c1c 220nf c6 c5 ns c8 499k r5 100k r6 1m r7 ns r8 c1a vin 1 vin 1 gnd 1 en 1 pgood 1 vcc c1d c3 100pf c4 1 2 4.7 r3 1m r4 40.2k r1 10k r2 2k r9 1 2 l1 gnd 1 2 ns c2a vout 1 sw 1 vout 1 gnd1 c2b c2c c2d c2e fb sw gnd sw 15,16 pgn d in vcc 7 ag nd 5 freq 2 fb 3 ss 4 en 1 pg 6 bst 8 9,14 mp8764gle in 10,11, 12,13 u1 mp8764gle
EV8764GLE-L-00A ? 12a, 18v synchronous step-down converter ev board EV8764GLE-L-00A rev.1.0 www.monolithicpower.com 3 6/16/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. EV8764GLE-L-00A bill of materials qty ref value description package manufacture part number 2 c1a, c1b 22 f ceramic capacitor; 25v;x7r;1210; 1210 murata grm32er61e226m 4 c1c, c1d, c2e, c3 0.1 f ceramic capacitor; 50v;x7r;0603 0603 murata grm188r71h104ka93d 0 c2a ns poscap 3 c2b, c2c, c2d 47 f ceramic capacitor; 6.3v;x5r;1206 1206 tdk c3216x5r0j476m 1 c4 100pf ceramic capacitor; 50v;x7r;0603 0603 murata grm1885c1h101ja01d 1 c5 1 f capacitor;25v;x7r 0603 murata grm188r71e105ka12 1 c6 220nf ceramic capacitor; 25v;x7r;0603 0603 murata grm188r71e223ja01d 0 c7, c8 r8 ns 0603 1 l1 1 h inductor;1 h; 1.35mohm;32a smd wurth 7443330100 1 r1 40.2k film resistor;1% 0603 yageo rc0603fr-0740k2l 1 r2 10k film resistor;1%; 0603 yageo rc0603fr-0710kl 1 r3 4.7 ? film resistor;5% 0603 yageo rc0603jr-074r7l 2 r4 r7 1m film resistor;5%; 0603 yageo rc0603jr-071ml 1 r5 499k film resistor;1% 0603 yageo rc0603fr-07499kl 1 r6 100k film resistor;1%; 0603 yageo rc0603fr-07100kl 1 r9 2k film resistor;1%; 0603 yageo rc0603fr-072kl 1 u1 step down converter qfn 3x4 mps mp8764gle
EV8764GLE-L-00A ? 12a, 18v synchronous step-down converter ev board EV8764GLE-L-00A rev.1.0 www.monolithicpower.com 4 6/16/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results performance waveforms are tested on the EV8764GLE-L-00A evaluation board. v in = 12v, v out = 3v, l = 1h, t a = +25oc, unless otherwise noted. input voltage(v) power lose(mw) output current(a) power lose vs. output current load regulation vs. output current line regulation vs. input voltage output current(a) output current(a) efficiency vs. output current 50 60 70 80 90 100 0.01 0.1 1 10 100 v in =18v v in =12v v in =8v 0 500 1000 1500 2000 2500 3000 0.01 0.1 1 10 100 v in =18v v in =12v v in =8v -3 -2 -1 0 1 2 0 2 4 6 8 10 12 v in =18v v in =12v v in =8v -5 -4 -3 -2 -1 0 1 4 6 8 10 12 14 16 18 i out =6a i out =12a i out =10ma
EV8764GLE-L-00A ? 12a, 18v synchronous step-down converter ev board EV8764GLE-L-00A rev.1.0 www.monolithicpower.com 5 6/16/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the EV8764GLE-L-00A evaluation board. v in = 12v, v out = 3v, l = 1h, t a = +25oc, unless otherwise noted. shutdown through input voltage i out =0a start up through input voltage i out =12a start up through enable i out =10ma shutdown through input voltage i out =12a start up through enable i out =12a shutdown through enable i out =10ma v out ac coupled 50mv/div. v in ac coupled 100mv/div. v sw 10v/div. i l 2a/div. v out ac coupled 20mv/div. v in ac coupled 500mv/div. v sw 10v/div. i l 10a/div. input/output voltage ripple i out =0a v out 2v/div. v in 10v/div. v pg 5v/div. v sw 5v/div. i l 2a/div. v out 2v/div. v in 4v/div. v pg 5v/div. v sw 5v/div. i l 1a/div. v out 2v/div. v in 10v/div. v pg 5v/div. v sw 10v/div. i l 10a/div. v out 2v/div. v en 5v/div. v pg 5v/div. v sw 10v/div. i l 2a/div. v out 2v/div. v en 5v/div. v pg 5v/div. v sw 10v/div. i l 2a/div. v out 2v/div. v en 5v/div. v pg 5v/div. v sw 10v/div. i l 10a/div. v out 2v/div. v in 5v/div. v pg 5v/div. v sw 10v/div. i l 10a/div. input/output voltage ripple i out =12a start up through input voltage i out =0a
EV8764GLE-L-00A ? 12a, 18v synchronous step-down converter ev board EV8764GLE-L-00A rev.1.0 www.monolithicpower.com 6 6/16/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the EV8764GLE-L-00A evaluation board. v in = 12v, v out = 3v, l = 1h, t a = +25oc, unless otherwise noted. thermal shutdown i out =0a, v out =3v thermal recovery i out =0a, v out =3v v out 50mv/div. i out 5a/div. shutdown through enable i out =12a v out 1v/div. v pg 5v/div. v sw 10v/div. i l 10a/div. v out 1v/div. v sw 5v/div. i l 2a/div. v out 2v/div. v en 5v/div. v pg 5v/div. v sw 10v/div. i l 10a/div. v out 1v/div. v sw 5v/div. i l 2a/div. short circuit protection
EV8764GLE-L-00A ? 12a, 18v synchronous step-down converter ev board EV8764GLE-L-00A rev.1.0 www.monolithicpower.com 7 6/16/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. printed circuit board layout figure 1?top silk layer figure 2 ? top layer figure 3?inner layer 1 figure 4 ? inner layer 2 figure 5 ? bottom layer
EV8764GLE-L-00A ? 12a, 18v synchronous step-down converter ev board notice: the information in this document is subject to change without notice. please contact mps for current specifications. users should warrant and guarantee that third party intellectual property rights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. EV8764GLE-L-00A rev.1.0 www.monolithicpower.com 8 6/16/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. quick start guide 1. connect the positive and negative terminals of the load to the vout and gnd pins, respectively. 2. preset the power supply output between 4.5v and 18v, and then turn off the power supply. 3. connect the positive and negative terminals of the power supply output to the vin and gnd pins, respectively. 4. turn the power supply on. the mp8764gle will automatically startup. 5. to use the enable function, apply a digital input to the en pin. drive en higher than 2v to turn on the regulator or less than 0.4v to turn it off. 6. use r1 and r2 to set the output voltage with vfb = 0.611v. follow the application information section in the device datasheet to select the proper value of r1, r2, inductor and output capacitor values when output voltage is changed. 7. if lower ripple at light loads is needed, then use 1.2 h or 1.5 h l1. but with the larger l1, the transient response peak to peak value will become larger too.
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