EV20051DN-00A low noise, high psrr, 1a linear regulator ev board EV20051DN-00A rev. 1.01 www.monolithicpower.com 1 8/3/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. the future of analog ic technology description the EV20051DN-00A evaluation board demonstrates the performance of mp20051, a low noise and low dropout linear regulator. it operates from 2.5v to 5.5v input voltage and the output voltage can be set externally which ranges from 0.8v to 5v. the EV20051DN-00A can supply up to 1a of load current, and features current limiting, over temperature protection. an internal pmos pass element is used to allow a low 110 a ground current, marking the mp20051 suitable for battery-power devices. electrical specifications parameter symbol value units input voltage v in 2.5 ? 5.5 v output voltage v out 1.1 v load current i out 1 a features ? up to 1a output current ? low 140mv dropout at 1a ? adjustable output from 0.8v to 5v ? 63db psrr at 1khz ? 13 vrms low noise output ? very fast transient responses ? current limit and thermal protection applications ? notebook computers ? cordless telephones ? cellular phones ? modems ? hand-held instruments ? pda and palmtop computers for mps green status, please visit mps website under quality assurance. mps? and ?the future of analog ic technology? are registered trademarks o f monolithic power systems, inc. EV20051DN-00A evaluation board (l x w x h) 2.5? x 2.5? x 0.4? (6.35cm x 6.35cm x 1.1cm) board number mps ic number EV20051DN-00A mp20051dn
EV20051DN-00A ? low noise, 1a linear regulator EV20051DN-00A rev. 1.01 www.monolithicpower.com 2 8/3/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. evaluation board schematic mp20051 3 fb 4.7 4 5 7,8 u1 3.75 k c3 EV20051DN-00A bill of materials qty ref value description package manufacturer part number 1 c1 2.2 f ceramic capacitor,x7r,16v 0805 tdk c2012x7r1c225k 1 c2 4.7 f ceramic capacitor,x5r,10v 0805 tdk c2012x5r1a475k 0 cin,cout, c3 ns 1 r1 3.75k ? film res, 1% 0603 any 1 r2 10k ? film res, 1% 0603 any 1 r3 100k film res, 5% 0603 any 1 u1 ldo regulator soic8e mps mp20051dn
EV20051DN-00A ? low noise, 1a linear regulator EV20051DN-00A rev. 1.01 www.monolithicpower.com 3 8/3/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. printed circuit board layout figure 1?top layer figure 2?bottom layer figure 3?top silk layer
EV20051DN-00A ? low noise, 1a linear regulator 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. EV20051DN-00A rev. 1.01 www.monolithicpower.com 4 8/3/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. quick start guide (a djustable output) the output voltage of this board is set externally which ranges from 0.8v to 5v by operating from +2.5v to +5.5v input as the figure 4. the default output voltage of this board is set to 1.1v. the board layout accommodates most commonly used resistors and capacitors. 1. attach the positive and negative ends of the load to the vout and gnd pins, respectively. 2. attach the input voltage (2.5v v in 5.5v) and input ground to the vin and gnd pins respectively. 3. to enable the mp20051, apply a voltage 1.5v v en 5.5v, to the en pin. to disable the mp20051, apply a voltage, v en < 0.4v, to the en pin. the en pin can be connected to v in with a 100k ? resistor for automatic startup. 4. the output voltage v out can be changed by varying r1. calculate the new value by formula: out fb v r1 r2( 1) v ? ? where v fb = 0.8v and r2 = 10k ? . example: for v out = 1.1v: 1.1 r1 10k ? 1 3.75k ? 0.8 ?? ??? ?? ?? therefore, use a 3.75k ? standard 1% value. figure 4
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