ev8756-d-00a 26v, 6a high current, low i q synchronous buck converter ev8756-d-00a rev.1.0 www.monolithicpower.com 1 12/25/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. the future of analog ic technology description the ev8756-d-00a is used for demonstrating the performance of mp8756, a fully-integrated, high efficiency, synchronous step-down switch mode converter. mp8756 provides up to 6a continuous output current over a wide input supply range with constant-on-time control for fast loop response. this part requires minimum number of external components and is available in qfn12 (2mmx3mm) package electrical specification parameter symbol value units input voltage v in 12 v output voltage v out 1 v output current i out 6 a switching frequency f sw 700 khz features ? wide 4.5v to 26v operating input range ? ultrasonic mode ? 117 a low quiescent current ? 6a continous output current ? adaptive cot for fast transient ? dc auto tune loop ? internal soft start ? output discharge ? 700khz switching frequency ? ocp, ovp, uvp (hiccup) protection and ? thermal shutdown. ? output adjustable from 0.6v ? qfn-12 (2mm x 3mm) 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. ev8756-d-00a evaluation board (l w h) 8.55cm 8.55cm 1.6cm board number mps ic number ev8756-d-00a MP8756GD 45.00 55.00 65.00 75.00 85.00 95.00 0.01 0.1 1 10
ev8756-d-00a ? 6a, 26v, low i q , synchronous buck converter ev8756-d-00a rev.1.0 www.monolithicpower.com 2 12/25/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. evaluation board schematic pg vcc agnd pgnd bst note: en resistor divider value should be modified accordingly with different input voltage. please refer to uvlo protection section on mp8756 datasheet for details. ev8756-d-00a bill of materials qty ref value description package manufacturer manufacturer p/n 2 c1a,c1b 22 f ceramic cap., 35v, x5r 1206 tdk c3216x5r1v226m 4 c1c,c2b, c2g,c6 0.1 f ceramic cap., 50v, x7r 0603 tdk c1608x7r1h104k 0 c2a ns 4 c2c,c2d, c2e,c2f 22f ceramic cap., 6.3v, x5r 0805 tdk c2012x5r0j226m 1 c3 0.22 f ceramic cap., 25v, x7r 0603 tdk c1068x7r1e224k 1 c4 1 f ceramic cap., 16v, x5r 0603 tdk c1608x5r1c105k 1 c5 220pf ceramic cap., 50v, c0g 0603 tdk c1608c0g1h221j 1 r1 48.7k film res., 1% 0603 royal rc0603fr-0748k7l 1 r2 66.5k film res., 1% 0603 royal rc0603fr-0766k5l 1 r3 3.6 ? film res., 1% 0603 royal rl0603fr-073r6l 1 r4 499k film res., 1% 0603 royal rl0603fr-07499kl 1 r5 1.5m film res., 1% 0603 royal rl0603fr-071m5l 1 r8 100k film res., 1% 0603 royal rl0603fr-07100kl 1 r9 499 ? film res., 1% 0603 royal rl0603fr-07499rl 0 r6,r7,r10 ns 1 l1 0.68 h inductor, drc=3.1m ? ,is=20a smd wurth 744311068 1 u1 mp8756 step-down converter qfn-12 2mm3mm mps MP8756GD
ev8756-d-00a ? 6a, 26v, low i q , synchronous buck converter ev8756-d-00a rev.1.0 www.monolithicpower.com 3 12/25/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. evb test results performance waveforms are tested on the ev8756-d-00a. v in =12v, v out =1v, l=0.68h, t j =+25c, unless otherwise noted.
ev8756-d-00a ? 6a, 26v, low i q , synchronous buck converter ev8756-d-00a rev.1.0 www.monolithicpower.com 4 12/25/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the ev8756-d-00a. v in =12v, v out =1v, l=0.68h, t j =+25c, unless otherwise noted.
ev8756-d-00a ? 6a, 26v, low i q , synchronous buck converter ev8756-d-00a rev.1.0 www.monolithicpower.com 5 12/25/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 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
ev8756-d-00a ? 6a, 26v, low i q , synchronous buck converter ev8756-d-00a rev.1.0 www.monolithicpower.com 6 12/25/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. figure 5: bottom layer
ev8756-d-00a ? 6a, 26v, low i q , synchronous buck converter 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. ev8756-d-00a rev.1.0 www.monolithicpower.com 7 12/25/2015 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2015 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 at 12v, 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 mp8756 will automatically start up. 5. to use the enable function, apply a digital input to the en pin. drive en high to turn on the regulator or low to turn it off. 6. use r1 and r2 to set the output voltage. 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.
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