EV2365DN-01A 3a, 28v, 1.4mhz step-down converter evaluation board EV2365DN-01A rev. 1.1 www.monolithicpower.com 1 9/20/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. the future of analog ic technology tm tm description the EV2365DN-01A is an evaluation board for the mp2365, a 1.4mhz step-down regulator with a built-in power mosfet. the mp2365 integrates a 120m ? mosfets that provides 3a continuous load current over a wide operating input voltage of 4.75v to 28v. current mode control provides fast transient response and eases loop stabilization. an adjustable soft-start prevents inrush current at turn-on. this device, available in an 8-pin soic and pdip packages, provides a very compact system solution with minimal reliance on external components. electrical specifications parameter symbol value units input voltage v in 4.75 ? 28 v output voltage v out 3.3 v output current i out 3 a features ? 3a output current ? wide 4.75v to 28v operating input range ? adjustable output from 0.92v to 21v ? fully assembled and tested applications ? distributed power systems ? battery chargers ? pre-regulator for linear regulators ?mps? and ?the future of analog ic technology? are trademarks of monolithic power systems, inc. EV2365DN-01A evaluation board (l x w x h) 2.0? x 1.9? x 0.5? (5.0cm x 4.8 x 1.2cm) board number mps ic number EV2365DN-01A mp2365dn efficiency curve 100 90 80 70 60 efficiency (%) 0 0.5 1.0 1.5 2.0 2.5 3.0 load current (a) v in =12v v out =3.3v v out =5v
EV2365DN-01A ? 3a, 28v, 1.4mhz step-down converter evaluation board EV2365DN-01A rev. 1.1 www.monolithicpower.com 2 9/20/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. tm evaluation board schematic c6 ns c5 5.6nf r7 ns c11 ns d1 b330a c7 10nf d2 ns en gnd r4 ns r8 ns c3 ns v out 3.3v/3a gnd vin gnd en ss gnd comp fb bs 7 8 46 1 3 5 2 sw in mp2365 c14 ns EV2365DN-01A bill of materials qty ref value description package manufacturer part number 2 c1, c2 4.7f ceramic cap., 50v, x7r 1210 murata grm32er71h475ka88l 4 c3, c6, c11, c14 not stuffed 1 c4 0.1f ceramic cap., 25v, x7r 603 tdk c1608x7r1e104k 1 c5 5.6nf ceramic cap., 50v, x7r 603 panasonic ecj-1vb1h562k 1 c7 10nf ceramic cap., 50v, x7r 603 tdk c1608x7r1h103k 2 c8, c9 22f ceramic cap., 6.3v, x5r 1210 tdk c3225x5r0j226m 3 c10, c12, c13 0.1f ceramic cap., 50v, x7r 805 tdk c2012x7r1h104k 1 r1 25.5k ? film res., 1% 603 panasonic erj-3ekf2552v 1 r2 10k ? film res., 1% 603 panasonic erj-3ekf1002v 1 r3 100k ? film res., 5% 603 panasonic erj-3geyj104v 3 r4, r7, r8 not stuffed 1 r5 15k ? film res., 5% 603 panasonic erj-3geyj153v 1 r6 0 ? film res., 5% 603 panasonic erj-3geyj0r00v 1 d1 diode schottky, 30v, 3a sma diodes inc b330a-13 1 d2 not stuffed 1 l1 inductor, 4.1a smd sumida cdrh8d43-4r7nc 1 u1 dc-dc converter so-8 mps mp2365dn
EV2365DN-01A ? 3a, 28v, 1.4mhz step-down converter evaluation board EV2365DN-01A rev. 1.1 www.monolithicpower.com 3 9/20/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. tm printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?bottom layer
EV2365DN-01A ? 3a, 28v, 1.4mhz step-down converter evaluation board notice: the information in this document is subject to change without notice. users should warrant and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. EV2365DN-01A rev. 1.1 www.monolithicpower.com 4 9/20/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. tm quick start guide 1. connect the positive and negative terminals of the load to the vout and gnd pins, respectively. 2. preset the power supply output to between 4.75v and 28v, then turn it off. 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 mp2365 will automatically startup). 5. to use the enable function, apply a digital input to the en pin. drive en higher than 2.9v to turn on the regulator or less than 0.9v to turn it off. 6. an under voltage lockout (uvlo) function can be implemented by the addition of a resistor divider (r3 and r4). the enable threshold is 2.6v, so the vin uvlo threshold is: v 6 . 2 4 r 3 r 1 ? ? ? ? ? ? + .
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