ev4420-j-00a 2a, 36v, synchronous step down converter ev4420-j-00a rev.1.0 www.monolithicpower.com 1 9/17/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. the future of analog ic technology description the ev4420-j-00a is an evaluation board for the mp4420/mpq4420, a high-frequency, synchronous, rectified, step-down, switch-mode converter with build-in power mosfets. it offers a very compact solution to achieve a 2a continuous output current with excellent load and lind regulation over a wide input supply range. the mp4420/mpq4420 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 mpq4420 requires a minimal number of readily-available standard external components, and is available in a space-saving tsot23-8 package. electrical specifications parameter symbol value units input voltage v in 4-30 v output voltage v out 3.3 v output current i out 2 a features ? wide 4v to 30v continuous operating input range ? 36v input transient tolerance for automotive load dump ? 90m ? /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 tsot23-8 package ? available in aec-q100 grade 1 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. ev4420-j-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 ev4420-j-00a MPQ4420GJ
ev4420-j-00a ? 2a, 36v, synchronous step down converter ev4420-j-00a rev.1.0 www.monolithicpower.com 2 9/17/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evaluation board schemetic 10uf c1a 50v 0.1uf c1c 50v 1m r1 ns r2 0.1uf c3 20 r4 10uh l1 4v-30v 22uf c2a 41.2k r7 3.3v/2a 0 r6 13k r8 10 r9 51k r5 33pf c4 0.1uf c2c 16v vin en vout gnd 10uf c1b 50v sw 3 en/sync 6 in 2 fb 8 vcc 7 bst 5 mpq4420 pg 1 u1 0.1uf c2 100k r3 pg 22uf c2b 16v 16v gnd ns d1 ? ev4420-j-00a bill of materials qty ref value description package manufacturer manufactuer_p/n 2 c1a, c1b 10f ceramic cap., 50v, x7r 1210 murata grm32er71h106ka12l 1 c1c 0.1 f ceramic cap., 50v, x7r 0603 murata grm188r71h104ka93d 2 c2a, c2b 22f 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 1 d1 ns 1 l1 10 h inductor, 40.9mohm dcr, 4.9a smd coilcraft xal5050-103me 1 r1 1m film res., 5% 0603 yageo rc0603jr-071ml 1 r3 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 0 film res., 5% 0603 yageo rc0603jr-070rl 1 r7 41.2k film res., 1% 0603 yageo rc0603fr-0741k2l 1 r8 13k film res., 1% 0603 yageo rc0603fr-0713kl 1 r9 10 film res., 1% 0603 yageo rc0603fr-0710rl 1 r2 ns 1 u1 step-down regulator tsot23- 8 mps MPQ4420GJ
ev4420-j-00a ? 2a, 36v, synchronous step down converter ev4420-j-00a rev.1.0 www.monolithicpower.com 3 9/17/2014 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.
ev4420-j-00a ? 2a, 36v, synchronous step down converter ev4420-j-00a rev.1.0 www.monolithicpower.com 4 9/17/2014 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.
ev4420-j-00a ? 2a, 36v, synchronous step down converter ev4420-j-00a rev.1.0 www.monolithicpower.com 5 9/17/2014 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.
ev4420-j-00a ? 2a, 36v, synchronous step down converter ev4420-j-00a rev.1.0 www.monolithicpower.com 6 9/17/2014 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.
ev4420-j-00a ? 2a, 36v, synchronous step down converter ev4420-j-00a rev.1.0 www.monolithicpower.com 7 9/17/2014 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. printed circuit layout figure 1 ? top silk layer figure 2 ? top layer figure 3 ? bottom layer
ev4420-j-00a ? 2a, 36v, synchronous step down 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. ev4420-j-00a rev.1.0 www.monolithicpower.com 8 9/17/2014 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 mp4420/mpq4420 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. an internal 500k ? resistor from en/sync to gnd allows en/sync to be floated to shut down the chip. 6. connect the en input pin through a pull-up resi stor (r1) to any voltage connected to the v in pin. make sure r1 big enough to limit the en input current to less than 150 a. for example, with 12v connected to v in , make sure r1 (12v ? 6.5v) 150 a = 36.7k ? . 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 internal zener diode at en pin. 7. 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. 8. use r7 and r8 to set the output voltage with v fb =0.792v. for r7=41.2k ? , r8 can be determined by: 1 0.792 v r7 r8 out ? = follow the application information section in the device datasheet to recalculate the compensation, inductor and output capacitor values when output voltage is changed.
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