evq8612-l-12-00a high efficiency, 12a, 6v synchronous step-down converter evaluation board evq8612-l-12-00a rev.1.1 www.monolithicpower.com 1 3/14/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. the future of analog ic technology description the evq8612-l-12-00a is an evaluation board for the MPQ8612GL-12, a high efficiency monolithic synchronous step-down converter. the evaluation board can deliver 12a continuous load current from a 3v to 6v 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 volge v in 3 ? 6 v output voltage v out 1.2 v output current i out 12 a switching frequency f sw 600 khz features ? wide 3v to 6v operating input range ? 12a output current ? 10m ? /7.8m ? internal power mosfets ? proprietary switching loss reduction technique ? adaptive cot for ultrafast transient response ? 1% reference voltage over -40 to +150 junction temperature range ? programmable soft start time ? pre-bias start up ? programmable switching frequency from 300khz to 1mhz. ? non-latch ocp, non-latch ovp protection and thermal shutdown ? available in a qfn3x4 package applications ? telecom system base station ? networking system ? server ? personal video recorders ? flat panel television and monitors ? distributed power systems all mps parts are lead-free, halogen free, and adhere to the rohs directive. for mps gree n status, please visit mps website under qualit y assurance. ?mps? and ?the future of anal og ic technology? are registered trademarks of monolithic power systems, inc. evq8612-l-12-00a evaluation board (l w h) 8.55cm 8.55cm 1.6cm board number mps ic number evq8612-l-12-00a MPQ8612GL-12 output current (a) 60 65 70 75 80 85 90 95 100 0.01 0.1 1 10 100
evq8612-l-12-00a ? evb description evq8612-l-12-00a rev.1.1 www.monolithicpower.com 2 3/14/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. evaluation board schematic ns c2h gnd gnd gnd gnd gnd vin freq en vcc pg ss fb sw bst gnd vin gnd vout vout gnd gnd 3-6vdc 1.2v/12a sw sw sw gn d gn d gn d in in in vcc 5 agnd 1 freq 14 fb 2 ss 3 en 4 pgood 6 bst 7 15-17 8 - 1 0 11-13 mpq8612 u1 gnd 2 f c1a 2 f c1b 2 f c1c 0.1 f c1d 2 f c1e 10pf c7 4.7 f/16v c5 33nf/16v c6 1 /16v c3 ns c2i 0.1 f/50v c2g 2 f c2a 2 f c2b 2 f c2c 2 f c2d ns c2e ns c2f 100k r6 100k r5 10 r8 0 r3 0 r9 10k r1 10k r2 1 /31.3a l1 sw voutsense gnd2 vinsense gnd_1 en vcc pg gnd_3 360k r7 274k r4 vin gnd vout gnd1 16v/1210 25v/1206 1206 16v/1210 390pf/50v c4 16v/1210 16v/1210 50v 5% 5% 16v/1210 16v/1210 16v/1210
evq8612-l-12-00a ? evb description evq8612-l-12-00a rev.1.1 www.monolithicpower.com 3 3/14/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. evq8612-l-12-00a bill of materials qty ref value description package manufacture part number 7 c1a, c1b, c1c, c2a, c2b, c2c, c2d 22 f ceramic capacitor; 16v;x7r; 1210 murata grm32er71c226ke18l 2 c1d, c2g 0.1 f ceramic capacitor; 50v;x7r;0603; 0603 murata grm188r71h104ka93d 1 c1e 22 f ceramic capacitor; 25v;x5r 1206 murata grm31cr61e226ke15 4 c2e, c2f, c2h,c2i ns ceramic capacitor; 16v;x7r; 1210 murata grm32er71c226ke18l 1 c3 1 f ceramic capacitor; 16v;x7r;0603; 0603 murata grm188r71c105ka12d 1 c4 390pf ceramic capacitor; 50v;x7r;0603 0603 lion 0603b391k500t 1 c5 4.7 f ceramic capacitor; 16v;x7r;1206 1206 murata grm31cr71c475ka01 1 c6 33nf ceramic capacitor; 16v;x7r;0603; 0603 murata grm188r71c333kao1d 1 c7 10pf ceramic capacitor; 50v;cog;0603; 0603 murata grm1885c1h100ja01 9 en, gnd2, gnd_1, gnd_3, pg, sw, vcc, vinsense, voutsense connector conn /1mm 4 gnd, gnd1, vin, vout connector conn /2mm 1 l1 1 h inductor;1uh; 1.72mohm;31.3a smd toko fdu1250c-1r0m 2 r1, r2 10k film resistor;1%; 0603 yageo rc0603fr-0710kl 2 r3, r9 0 film resistor ;5%; 0603 yageo rc0603jr-070rl 1 r4 274k film resistor;1% 0603 yageo rc0603fr-07274kl 2 r5, r6 100k film resistor;1%; 0603 yageo rc0603fr-07100kl 1 r7 360k film resistor;1% 0603 yageo rc0603fr-07360kl 1 r8 10 film resistor;1%; 0603 yageo rc0603fr-0710rl 1 u1 step down converter qfn 3x4 mps MPQ8612GL-12
evq8612-l-12-00a ? evb description evq8612-l-12-00a rev.1.1 www.monolithicpower.com 4 3/14/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. evb test results performance waveforms are tested on the evq8612-l-12-00a. v in = 5v, v out = 1.2v, l = 1h, t a = 25c, unless otherwise noted. output current (a) output current (a) line regulation load regulation i out (a) v in (v) efficiency power loss 60 65 70 75 80 85 90 95 100 0.01 0.1 1 10 100 0 500 1000 1500 2000 0.01 0.1 1 10 100 -1.00 -0.50 0.00 0.50 1.00 3456 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 024681012
evq8612-l-12-00a ? evb description evq8612-l-12-00a rev.1.1 www.monolithicpower.com 5 3/14/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the evq8612-l-12-00a. v in = 5.0v, v out =1.2v, l = 1.0h, t a = 25c, unless otherwise noted. v out (ac) 20mv/div. v in (ac) 10mv/div. v sw 5v/div. i l 2.5a/div. v out (ac) 10mv/div. v in (ac) 10mv/div. v sw 5v/div. i l 1a/div. v out (ac) 10mv/div. v in (ac) 100mv/div. v sw 5v/div. i l 10a/div. input/output voltage ripple i out = 0a input/output voltage ripple i out = 0.4a input/output voltage ripple i out = 12a v out 1v/div. v in 2v/div. v pg 2v/div. v out 1v/div. v in 2v/div. v pg 2v/div. v out 1v/div. v en 5v/div. v pg 5v/div. v out 1v/div. v en 5v/div. v pg 5v/div. power good through v in start-up i out = 12a power good through v in shutdown i out = 12a power good through en start-up i out = 12a power good through en shutdown i out = 12a v out 1v/div. v in 5v/div. v sw 5v/div. i l 1a/div. v out 1v/div. v in 5v/div. v sw 5v/div. i l 10a/div. start-up through v in i out = 0a start-up through v in i out = 12a
evq8612-l-12-00a ? evb description evq8612-l-12-00a rev.1.1 www.monolithicpower.com 6 3/14/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the evq8612-l-12-00a. v in = 5.0v, v out =1.2v, l = 1.0h, t a = 25c, unless otherwise noted. shutdown through v in i out = 0a shutdown through v in i out = 12a start-up through en i out = 0a v out 1v/div. v en 5v/div. v out (ac) 200mv/div. i l 5a/div. start-up through en i out = 12a shutdown through en i out = 0a shutdown through en i out = 12a v out 1v/div. v sw 5v/div. i l 10a/div. v out 1v/div. v sw 5v/div. i l 10a/div. v out 1v/div. v in 5v/div. v sw 2v/div. i l 1a/div. v out 1v/div. v in 5v/div. v sw 5v/div. i l 10a/div. v out 1v/div. v en 5v/div. v sw 5v/div. i l 2.5a/div. v out 1v/div. v en 5v/div. v sw 5v/div. i l 10a/div. v out 1v/div. v en 5v/div. v sw 5v/div. v sw 5v/div. i l 1a/div. i l 10a/div. short circuit protection thermal shutdown i out = 12a
evq8612-l-12-00a ? evb description evq8612-l-12-00a rev.1.1 www.monolithicpower.com 7 3/14/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the evq8612-l-12-00a. v in = 5.0v, v out =1.2v, l = 1.0h, t a = 25c, unless otherwise noted. v out 1v/div. v sw 5v/div. i l 10a/div. thermal recovery i out = 12a
evq8612-l-12-00a ? evb description evq8612-l-12-00a rev.1.1 www.monolithicpower.com 8 3/14/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 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
evq8612-l-12-00a ? evb description evq8612-l-12-00a rev.1.1 www.monolithicpower.com 9 3/14/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. figure 5: bottom layer figure 6: bottom silk layer
evq8612-l-12-00a ? evb description notice: the information in this document is subject to change wi thout notice. please contact m ps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. evq8612-l-12-00a rev.1.1 www.monolithicpower.com 10 3/14/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. quick start guide 1. connect the positive and negative terminals of t he load to the vout and gnd pins respectively. 2. preset the output of power supply between 3v and 6v, 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 MPQ8612GL-12 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. use r1 and r2 to set the output voltage within vfb=0.6v. 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 low ripple at light loads is needed, then use toko 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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