ev4423-q-00a 3a, 36v, synchronous step down converter evaluation board ev4423-q-00a rev.1.0 www.monolithicpower.com 1 12/16/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. the future of analog ic technology description the ev4423-q-00a is an evaluation board for the mp4423/mpq4423, a high-frequency, synchronous, rectified, step-down, switch-mode converter with build-in power mosfets. it offers a very compact solution to achieve a 3a continuous output current with excellent load and line regulation over a wide input supply range. the mp4423/mpq4423 has synchronous mode operation for higher efficiency over the output current load range. current-mode operation provides fast transient response and eases loop stabilization. full protection features include over-current protection and thermal shut down. the ev4423-q-00a uses a minimal number of readily-available standard components, and is assembled and tested in space-saving qfn-8 (3mmx3mm) package. electrical specifications parameter symbol value units input voltage v in 4-30(continuous)/ 36(transient) v output voltage v out 3.3 v output current i out 3 a features ? wide 4v to 30v continuous operating input range ? 36v input transient tolerance for automotive load dump ? 85m ? /55m ? low rds(on) internal power mosfets ? high-efficiency synchronous mode operation ? default 410khz switching frequency ? synchronizes to a 200khz to 2.2mhz external clock ? high duty cycle for automotive cold-crank ? power-save mode ? internal soft-start ? power good ? ocp protection and hiccup ? thermal shutdown ? output adjustable from 0.8v ? available in an qfn-8 (3mmx3mm) package ? fully assembled and tested applications ? automotive ? ? industrial control system ? distributed power systems all mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under quality assurance. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic powe r systems, inc. ev4423-q-00a evaluation board (l x w x h) 2.5? x 2.5? x 0.2? (6.35cm x 6.35cm x0.5cm) board number mps ic number ev4423-q-00a MPQ4423GQ
ev4423-q-00a ? 3a, 36v, synchronous st ep down converter evaluation board ev4423-q-00a rev.1.0 www.monolithicpower.com 2 12/16/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evaluation board schemetic gnd 5 2 3
ev4423-q-00a ? 3a, 36v, synchronous st ep down converter evaluation board ev4423-q-00a rev.1.0 www.monolithicpower.com 3 12/16/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. ev4423-q-00a bill of materials qty ref value description package manufacture part number 2 c1a,c1b 10 f ceramic cap., 50v, x7r 1210 murata grm32er71h106ka12l 1 c1c 0.1 f ceramic cap., 50v, x7r 0603 murata grm188r71h104ka93d 2 c2a,c2b 22 f ceramic cap., 16v, x7r 1210 murata grm32er71c226ke79 3 c2,c2c,c3 0.1 f ceramic cap., 16v, x7r 0603 murata grm188r71c104ka01d 1 c4 33pf ceramic cap., 50v, c0g 0603 murata grm1885c1h330ja01d 6 cin1,cin2, cin3,cin4, cin5,cout1 ns 1 d1 ns 1 fb1 ns 1 l1 ns 1 l2 10 h inductor, 40.9mohm dcr, 4.9a smd coilcraft xal5050-103me 1 r1 1m film res., 5% 0603 yageo rc0603jr-071ml 2 r3,r9 100k film res., 1% 0603 yageo rc0603fr-07100kl 1 r4 20 film res., 1% 0603 yageo rc0603fr-0720rl 1 r5 51k film res., 1% 0603 yageo rc0603fr-0751kl 1 r6 10 film res., 1% 0603 yageo rc0603fr-0710rl 1 r7 41.2k film res., 1% 0603 yageo rc0603fr-0741k2l 1 r8 13k film res., 1% 0603 yageo rc0603fr-0713kl 1 r10 20k film res., 1% 0603 yageo rc0603fr-0720kl 1 r12 1k film res., 1% 0603 yageo rc0603fr-071kl 2 r2,r11 ns 1 q1 transistor, 40v, 0.2a sot-23 on semiconductor mmbt3904lt1 1 u1 step-down regulator qfn3x3 -8 mps MPQ4423GQ 5 vin, vemi, gnd, vout, gnd 2.0 golden pin hz 5 en/sync, gnd,pg, gnd, clk_out 1.0 golden pin hz
ev4423-q-00a ? 3a, 36v, synchronous st ep down converter evaluation board ev4423-q-00a rev.1.0 www.monolithicpower.com 4 12/16/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results v in = 12v, v out =3.3v, c out = 2x22f, l = 10h, t a = +25 ? c, unless otherwise noted.
ev4423-q-00a ? 3a, 36v, synchronous st ep down converter evaluation board ev4423-q-00a rev.1.0 www.monolithicpower.com 5 12/16/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results (continued) v in = 12v, v out =3.3v, c out = 2x22f, l = 10h, t a = +25 ? c, unless otherwise noted.
ev4423-q-00a ? 3a, 36v, synchronous st ep down converter evaluation board ev4423-q-00a rev.1.0 www.monolithicpower.com 6 12/16/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results (continued) v in = 12v, v out =3.3v, c out = 2x22f, l = 10h, t a = +25 ? c, unless otherwise noted. v sw 10v/div. v sw 5v/div. v out 2v/div. v pg 5v/div. v en 2va/div. v sw 5v/div. v clk_out 2v/div. v in 5v/div. v out 2v/div. i l 2a/div. v in 5v/div. v out 2v/div. v sw 10v/div. i l 2a/div. v sw 5v/div. v out 2v/div. v pg 5v/div. v en 2va/div.
ev4423-q-00a ? 3a, 36v, synchronous st ep down converter evaluation board ev4423-q-00a rev.1.0 www.monolithicpower.com 7 12/16/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. printed circuit layout figure1 ? top silk layer figure 2 ? top layer figure3 ? inner layer 1 figure 4 ? inner layer 2 figure5 ? bottom layer figure 6 ? bottom silk layer
ev4423-q-00a ? 3a, 36v, synchronous st ep down converter evaluation board 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. ev4423-q-00a rev.1.0 www.monolithicpower.com 8 12/16/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 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 power supply output to between 4v to 30v and then turn it off. 3. connect the positive and negative terminals of t he power supply output to the vin and gnd pins respectively. 4. turn the power supply on. the mp4423/mpq4423 will automatically startup. 5. to use the enable function, apply a digital input to the en pin. drive en higher than 1.65v to turn on the regulator, drive en less than 1.05v to turn it off. 6. connect the en input pin through a pull-up resistor to any voltage connected to the vin pin. make sure the pull-up resistor big enough to limit the en input current to less than 150 a. for example, with 12v connected to v in , r pullup (12v ? 6.5v) 150 a = 36.7k ? . 7. connect the en pin directly to a voltage source without any pull-up resistor requires limiting voltage amplitude to 6v to prevent damage to the zener diode. 8. connect the en input pin with an external clock with a range of 200khz to 2.2mhz after output voltage is set to synchronize the internal clock rising edge to the external clock rising edge. the pulse width of external clock signal should be less than 1.7 s. 9. use r7 and r8 to set the output voltage with v fb =0.792v. for r7=41.2k ? , r8 can be determined by: out 0.792*41.2 r8 k ? v0.792 ? ? follow the application information section in the device datasheet to recalculate the compensation, inductor and output capacitor values when output voltage is changed. 10. clk_out is a signal inverted to sw and can be used as other buck?s sync signal to get 180 degree out of phase. the high voltage of clk_out is equal to the output voltage of the board, so make sure it is safe for the synchronized part when the output voltage setting value is high.
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