ev28115dq-00b 4a, 6v, synchronous step-down switching regulator ev board ev28115dq-00b rev. 1.0 www.monolithicpower.com 1 10/12/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. the future of analog ic technology description the ev28115dq-00b is an evaluation board for the mp28115. the mp28115 delivers 4a continuous load current over an operating input voltage 2.7v to 6.0v. the output is adjustable over a range of 0.8v to 0.9xv in by means of an external resistor from fb pin to ground. the current mode control used in mp28115 provides fast transient response and cycle-by- cycle current limiting. the ev board will go into hiccup mode to protect against over current/short circuit. this ev board can be turned on or shut down via a remote on/off input that is referenced to ground. this input is compatible with popular logic devices. this ev board also has power good indicator. the output of pok is pulled to ground when output voltage is under or over 10% of its setting voltage. electrical specifications parameter symbol value units input voltage v in 2.7 ? 6.0 v output voltage v out 1.8 v output current i out 4 a features ? 4a output current ? 2.7v to 6.0v operating input range ? built-in soft start ? adjustable output from 0.8v to 0.9xv in ? fully assembled and tested applications ? p/asic/dsp/fpga core and i/o supplies ? printers and lcd tvs ? network and telecom equipment ? point of load regulators ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. ev28115dq?00b evaluation board (l x w x h) 2.4? x 2.0? x 0.5? (6.1cm x 5.1cm x 1.4 cm) board number mps ic number ev28115dq-00b MP28115DQ 70 65 60 75 80 85 90 95 100 output current (a) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
ev28115dq-00b ? 4a, 5.5v, synchronous step-down regulator ev board ev28115dq-00b rev. 1.0 www.monolithicpower.com 2 10/12/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. evaluation board schematic d3 ns d1 ns c7 ns c1 22 f 16v c2 22 f 16v c3 100nf 16v d2 b0540w-7-f r2 10k ? r1 12.4k ? r7 ns c5 ns r5 100k ? r9 0 ? r8 200k ? r6 0 ? r3 ns r4 100k ? l1 0.95 h c6 22 f 6.3v c4 22 f 6.3v gnd gnd vin gnd vout en/sync gnd 2, 9, 11 4, 7 5 10 6 1 3, 8 fb sw mp28115 on/off pok/vcc c8 ns pok in bst ev28115dq?00b bill of materials qty ref value description package manufacturer manufacturer p/n 2 c1, c2 22 f ceramic cap., 16v, x7r 1210 murata grm32er71c226k 1 c3 100nf ceramic cap., 16v, x7r 0603 murata grm188r71c104k 2 c4, c6 22 f ceramic cap., 6.3v, x7r 1210 murata grm32er70j226k 3 c5, c7, c8 ns not stuffed 1 r1 12.4k ? film resistor, 1% 0603 yageo rc0603fr-0712k4l 1 r2 10 k ? film resistor, 1% 0603 yageo rc0603fr-0710k0l 2 r3, r7 ns not stuffed 2 r4, r5 100 k ? film resistor, 5% 0603 yageo rc0603fr-07100kl 2 r6, r9 0 ? film resistor, 5% 0603 yageo rc0603jr-0700r0l 1 r8 200 k ? film resistor, 5% 0603 yageo rc0603jr-07200kl 2 d1, d3 ns not stuffed 1 d2 0.5a, 40v schottky diode sod-123 diodes inc b0540w-7-f 1 l1 0.95 h inductor, dcr=7.4m ? smd wurth electronics 744310095 1 u1 step-down regulator qfn10 mps MP28115DQ
ev28115dq-00b ? 4a, 5.5v, synchronous step-down regulator ev board ev28115dq-00b rev. 1.0 www.monolithicpower.com 3 10/12/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?inner layer 1 figure 4?inner layer 2 figure 5?bottom layer
ev28115dq-00b ? 4a, 5.5v, synchronous step-down regulator ev board notice: the information in this document is subject to change wi thout notice. users should warra nt 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. ev28115dq-00b rev. 1.0 www.monolithicpower.com 4 10/12/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. 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 3.3v-6.0v, 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 ev28115dq board will automatically startup. 5. to use the enable function, apply a digital input to the en pin. drive en higher than 1.6v to turn on the regulator, drive en less than 0.4v to turn it off. 6. use r1 and r2 to set the output voltage with v fb = 0.8v. 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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