EV20045DN-00A low noise, 1a, linear regulator ev board EV20045DN-00A rev. 1.0 www.monolithicpower.com 1 11/3/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. the future of analog ic technology description the EV20045DN-00A evaluation board demonstrates the performance of mp20045, a low noise and low dropout linear regulator. it operates from a 2.5v to 5.5v input voltage and the output voltage can be set externally which ranges from 1.5v to 5v. the EV20045DN-00A can supply up to 1a of load current, and features current limiting, over temperature protection and power-good status. an internal pmos pass element is used to allow a low 110ua ground current, marking the mp20045 suitable for battery-power devices. electrical specifications parameter symbol value units input voltage v in 3.5 ? 5.5 v output voltage v out 3 v load current i out 1 a features ? up to 1a output current ? low 140mv dropout at 1a ? adjustable output ? 56db psrr at 1khz ? 13 vrms low noise output ? open drain power-good status 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 mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. EV20045DN-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 EV20045DN-00A mp20045dn
EV20045DN-00A ? low noise, 1a linear regulator EV20045DN-00A rev. 1.0 www.monolithicpower.com 2 11/3/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. evaluation board schematic pg vin c1 ns r3 100k u1 r4 100k r1 10k r2 10k cout ns en 7,8 6 4 3 5 1,2 en gnd fb vout mp20045 vout pg vin EV20045DN-00A bill of materials qty ref value description package manufacturer part number 1 cin 10uf ceramic capacitor,x7r,16v 1210 tdk c3225x7r1c106m 1 c2 2.2uf ceramic capacitor,x7r,16v 0805 tdk c2012x7r1c225k 1 c3 100pf ceramic capacitor,c0g,50v 0603 tdk c1608c0g1h101j 0 c1,cout ns 2 r1, r2 10k ? film res, 1% 0603 any 2 r3, r4 100k ? film res, 5% 0603 any 1 u1 ldo regulator soic8e mps mp20045dn
EV20045DN-00A ? low noise, 1a linear regulator EV20045DN-00A rev. 1.0 www.monolithicpower.com 3 11/3/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. printed circuit board layout figure 1?top layer figure 2?bottom layer figure 3?top silk layer
EV20045DN-00A ? low noise, 1a linear regulator EV20045DN-00A rev. 1.0 www.monolithicpower.com 4 11/3/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. quick start guide (a djustable output) the output voltage of this board is set externally which ranges from 1.5v 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 3.0v. 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 (3.5v v in 5.5v) and input ground to the vin and gnd pins, respectively. 3. to enable the mp20045, apply a voltage, 1.5v v en 5.5v, to the en pin. to disable the mp20045, 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 r2. calculate the new value by formula: out fb r1 r2 v ()1 v = ? where v fb = 1.5v and r1 = 10k ? . example: for v out = 3.0v: 10k ? 1 ) 1.5 3.0 ( 10k ? r2 = ? = therefore, use a 10k ? standard 1% value. mp20045 r1 r2 c out 2.2 c3(optioanl) 0.1 vout vin en fb r3 100k pg 1 out 2 v = (1+ )volts r 1.5 r figure 4?adjustable version mp20045 c out 2.2 vout vin en fb r3 100k c in 10 pg figure 5?fixed version
EV20045DN-00A ? low noise, 1a linear regulator 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. EV20045DN-00A rev. 1.0 www.monolithicpower.com 5 11/3/2009 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2009 mps. all rights reserved. quick start guide (modification for fixed output) for modifying the EV20045DN-00A to accommodate a fixed output voltage version of the mp20045 as the figure 5: 1. carefully remove the ic(u1) and replace it with the corresponding fixed output version of the mp20045 chip. 2. remove both r1 and r2. 3. short r1 while leaving r2 open. 4. attach the positive and negative ends of the load to the vout and gnd pins, respectively. 5. attach the input voltage (3.5v v in 5.5v) and input ground to the vin and gnd pins, respectively. 6. to enable the mp20045, apply a voltage, 1.5v v en 5.5v, to the en pin. to disable the mp20045, 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. please refer to the datasheet for the detailed information of the different output voltage option of mp20045.
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