ev2305ds-00a 4.75v to 23v in, 2a out synchronous buck converter evaluation board ev2305ds-00a rev. 1.5f www.monolithicpower.com 1 9/14/2005 mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. the future of analog ic technology tm tm description the ev2305ds-00a is the evaluation board of mps? mp2305 synchronous buck converter. it has a wide supply range from 4.75v to 23v and a continuous output current up to 2a. it features synchronous rectification for high efficiency with integrated high-side and low-side power mosfets. the output voltage is preset to 3.3v, but can be easily adjusted to other levels from 0.923v. current mode control and integrated power mosfets minimize component counts, board area, and solution cost. fault condition protections include cycle-by-cycle current limiting, thermal shutdown and under-voltage lockout. programmable soft-start reduces turn-on stress. small so-8 package minimizes board area. electrical specifications parameter symbol value units supply voltage v in 4.75 to 23 v output voltage v out 3.3 v output current i out 0 to 2 a features ? up to 2a output current ? wide 4.75v to 23v operating input range ? monolithic synchronous buck with 130m ? high-side and low-side fets ? fixed 340khz frequency ? all ceramic input and output capacitors ? programmable soft-start ? programmable input under voltage lockout applications ? distributed power systems ? networking systems ? fpga, dsp, asic power supplies ? green electronics/ appliances ? notebook computers ?mps? and ?the future of analog ic technology? are trademarks of monolithic power systems, inc. ev2305ds-00a eval uation board (l x w x h) 2.0? x 1.5? x 0.5? (5.0cm x 3.8cm x 1.2cm) board number mps ic number ev2305ds-00a MP2305DS 100 95 90 85 80 75 70 65 60 55 50 efficiency (%) 0 1.0 2.0 2.5 1.5 0.5 load current (a) mp2305-ec01 efficiency vs load current v out = 3.3v v out = 2.5v
ev2305ds-00a ? 4.75v to 23v in, 2a out synchronous buck converter evaluation board ev2305ds-00a rev. 1.5f www.monolithicpower.com 2 9/14/2005 mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. tm evaluation bo ard schematic mp2305 fb comp en ss 1 2 3 4 8 7 6 5 bs in sw gnd r5 open c5 open d1 open c1 10nf u1 c8 open c4 open c3 3.3nf c7 open vout 3.3v/2a sw vin 4.75v to 23v ss en ev2305_s01 ev2305ds-00a bill of materials item qty ref value description package manufacturer part number 1 1 c1 10nf ceramic cap, 50v, x7r sm0805 avx 08055c103kat2a 2 1 c2 10f ceramic cap, 25v, x5r sm1210 avx 12103d106kat2a 3 1 c3 3.3nf ceramic cap, 50v, x7r sm0805 avx 08055c332kat2a 4 4 c4, c5 c7, c8 open not stuffed 5 1 c6 0.1f ceramic cap, 50v, x7r sm0805 avx 08055c104kat2a 6 1 c9 22f ceramic cap, 16v, x5r sm1210 avx 1210yd226kat2a 7 1 d1 do not stuff 8 1 l1 10h inductor, 2.5a smd sumida cdrh8d28 9 1 r1 26.1k ? resistor, 1% sm0805 panasonic erj-6enf2612v 10 1 r2 5.6k ? resistor, 5% sm0805 panasonic erj-6geyj562v 11 1 r3 10k ? resistor, 1% sm0805 panasonic erj-6enf1002v 12 1 r4 100k ? resistor, 5% sm0805 panasonic erj-6geyj104v 13 1 r5 open not stuffed sm0805 14 1 u1 dc-dc converter so8 mps MP2305DS
ev2305ds-00a ? 4.75v to 23v in, 2a out synchronous buck converter evaluation board notice: the information in this document is subject to change wi thout notice. please contact mps for current specifications. users should warrant and guarantee that th ird party intellectual property rights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. ev2305ds-00a rev. 1.5f www.monolithicpower.com 3 9/14/2005 mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. tm printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?bottom layer quick start guide 1. connect the positive terminals of the load to the vout pins and the negative terminals to the gnd pins. 2. preset the power supply output to 4.75v to 23v and turn it off. 3. connect the positive terminal of the power supply output to the vin pin and the negative terminal to the gnd pin 4. turn on the power supply; the mp2305 will automatically startup. 5. to use the enable function, apply a digital input to the en pin. dr ive en higher than 2.5v to turn on the regulator or less than 0.7v to turn it off. 6. an under voltage lockout (uvlo) function c an be implemented by the addition of a resistor divider (r4 and r5). the en threshold is 1.3v, so vin uvlo threshold is: v 3 . 1 5 r 4 r 1 ? ? ? ? ? ? + .
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