EV8765-Q-00A 24v, high current synchronous step-down converter evaluation board EV8765-Q-00A rev.1.0 www.monolithicpower.com 1 12/27/2013 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology description the EV8765-Q-00A is an evaluation board for the mp8765gq, a high efficiency monolithic synchronous step-down converter. the evaluation board can deliver 6a continuous load current from a 5v to 24v input with excellent load and line regulation. constant-on-time (cot) control mode provides fast transient response and eases loop stabilization. the evaluation board can be turned on or shut down via a remote on/off input that is reference to ground. this input is compatible with popular logic devices. electrical specification parameter symbol value units input voltage v in 5 ? 24 v output voltage v out 1.05 v output current i out 6 a switching frequency f sw 500 khz features ? wide 5v to 24v operating input range ? 6a continous output current ? pfm/pwm mode selectable ? low r ds (on) internal power mosfets ? proprietary switching loss reduction technique ? 1% reference voltage ? internal soft start ? output discharge ? 500khz switching frequency ? ocp, ovp, uvp protection and thermal shutdown ? available in a qfn3x3 package applications ? laptop computer ? tablet pc ? networking systems ? personal video recorders ? flat panel television and monitors ? distributed power systems all 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. EV8765-Q-00A evaluation board mp8765 demo board EV8765-Q-00A (l w h) 8.55cm 8.55cm 1.6cm board number mps ic number EV8765-Q-00A mp8765gq
EV8765-Q-00A ?24v, high current synchronous step-down converter EV8765-Q-00A rev.1.0 www.monolithicpower.com 2 12/27/2013 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. evaluation board schematic
EV8765-Q-00A ?24v, high current synchronous step-down converter EV8765-Q-00A rev.1.0 www.monolithicpower.com 3 12/27/2013 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. EV8765-Q-00A bill of materials qty. ref value description package manufacture manufacture_pn 2 c1a, c1b 22 f ceramic capacitor; 25v;x5r;1210; 1210 murata grm32er61e226ke15l 1 c1c 100nf ceramic capacitor; 50v;x7r;0603; 0603 murata grm188r71h104ka93d 0 c2a ns poscap 3 c2b, c2f, c7 100nf ceramic capacitor; 16v;x7r;0603; 0603 murata grm188r71c104ka01d 3 c2c, c2d, c2e 22 f ceramic capacitor; 6.3v;x5r;1206 1206 murata grm31cr60j226ke19 1 c3 220nf ceramic capacitor; 16v;x7r;0603; 0603 murata grm188r71c224ka01 1 c4 220pf ceramic capacitor; 50v;x7r;0603; 0603 murata grm188r71h221ka01d 1 c5 1 f ceramic capacitor; 6.3v;x5r;0603 0603 murata grm188r60j105ka01d 0 c6 ns 0603 0 cn_out ns connector 0 d1 ns 1 l1 1.5 h inductor;1.5 h;6.6m ? ; 14a smd wurth 744311150 1 r1 63.4k film resistor;1%; 0603 yageo rc0603fr-0763k4l 1 r2 82k film resistor;1% 0603 yageo rc0603fr-0782kl 1 r3 4.7 film resistor;5%; 0603 yageo rc0603jr-074r7l 1 r4 1m film resistor;5% 0603 any 1 r5 499k film resistor;1%; 0603 yageo rc0603fr-07499kl 0 r6 ns 0603 1 r7 0 film resistor;5% 0603 any 1 r8 100k film resistor;1%; 0603 yageo rc0603fr-07100kl 1 r9 499 film resistor;1%; 0603 yageo rc0603fr-07499rl 1 u1 step down converter qfn 33 mps mp8765gq
EV8765-Q-00A ?24v, high current synchronous step-down converter EV8765-Q-00A rev.1.0 www.monolithicpower.com 4 12/27/2013 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. evb test results performance waveforms are tested on the EV8765-Q-00A. v in = 12v, v out = 1.05v, l = 1.5h, pfm mode, t a = 25c, unless otherwise noted. 30 40 50 60 70 80 90 100 0.001 0.01 0.1 1 10 0 200 400 600 800 1000 1200 1400 1600 0.001 0.01 0.1 1 10
EV8765-Q-00A ?24v, high current synchronous step-down converter EV8765-Q-00A rev.1.0 www.monolithicpower.com 5 12/27/2013 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the EV8765-Q-00A. v in =12v, v out =1.05v, l=1.5h, pfm mode, t j =+25c, unless otherwise noted.
EV8765-Q-00A ?24v, high current synchronous step-down converter EV8765-Q-00A rev.1.0 www.monolithicpower.com 6 12/27/2013 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the EV8765-Q-00A. v in =12v, v out =1.05v, l=1.5h, pfm mode, t j =+25c, unless otherwise noted.
EV8765-Q-00A ?24v, high current synchronous step-down converter EV8765-Q-00A rev.1.0 www.monolithicpower.com 7 12/27/2013 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the EV8765-Q-00A. v in =12v, v out =1.05v, l=1.5h, pfm mode, t j =+25c, unless otherwise noted.
EV8765-Q-00A ?24v, high current synchronous step-down converter EV8765-Q-00A rev.1.0 www.monolithicpower.com 8 12/27/2013 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. printed circuit board layout figure 1: top silk layer figure 2: top layer figure 3: inner layer1 figure 4: inner layer2 figure 5: bottom layer
EV8765-Q-00A ?24v, high current synchronous step-down converter 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. EV8765-Q-00A rev.1.0 www.monolithicpower.com 9 12/27/2013 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2013 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 output of power supply between 5v and 24v, 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 mp8765gq will automatically start up. 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. connect mode pin to gnd (r7=0) to set part work at auto pfm/fwm mode. float mode pin (r7=ns) or connect it to vcc can set part work at force pwm mode. 7. use r1 and r2 to set the output voltage within vfb=0.604v. 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. 8. if low ripple at light loads is needed, then use 2.0h l1. but with the larger l1, the transient response peak to peak value will become larger too.
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