EV3021DQ-00A 1x, 1.5x, 2x auto-adjust charge pump white led backlight evaluation board EV3021DQ-00A rev. 1.2 www.monolithicpower.com 1 10/18/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. the future of analog ic technology description the EV3021DQ-00A is the evaluation board for the mp3021, a wled driver that can drive up to 4 backlight wleds at up to 30ma each. backlight brightness can be adjusted with a 5-bit register plus one bit for precise low brightness control. the mp3021 employs an efficient inductorless charge pump with 1x, 1.5x and 2x automatic mode control to achieve high efficiency power conversions. monolithic power system?s single wire mpc tm serial data link provides a simple and fast interface used to enable, disable and set current levels for each led. in addition, soft-start limits the inrush current during startup and mode switching. electrical specifications parameter symbol value units input voltage v in 2.5 ? 5.5 v # of wleds 4 led current i led 30 ma features ? backlight: up to 4 wleds at 30ma each ? single wire serial bus (mpc tm serial data link) simple, low overhead solution fast data transfer rate ? thermal shutdown protection ? under-voltage protection ? available in a 3mm x 3mm 16-pin qfn package applications ? cellular phones ? pda phones ? pdas mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. mpc is a trademark of monolithic power systems, inc. EV3021DQ-00A evaluation board (l x w x h) 2.6? x 2.5? x 0.4? (6.6cm x 6.4cm x 1.0cm) board number mps ic number EV3021DQ-00A mp3021dq 100 90 80 70 60 50 40 30 20 efficiency (%) 2.5 3.0 3.5 4.0 4.5 battery voltage (v) efficiency vs battery voltage i_led=30ma i_led=20ma i_led=10ma
EV3021DQ-00A ? 1x, 1.5x, 2x auto-adjust charge pump EV3021DQ-00A rev. 1.2 www.monolithicpower.com 2 10/18/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. evaluation board schematic mp3021 led0 led1 led2 led3 pic12f675 pattern generation circuit vss gp0 gp1 gp2 vdd clkout vpp clkin vcc jpi vss c2a vin data cp c2b c1b c1a nc iset nc nc vin gnd vpp tp1 vcc tp2 gnd tp3 gp0 tp4 gp1 tp5 sw1 sw2 bright down bright up tp_clkout tp_clkin tp_vpp led4 r18 0 r17 0 r16 0 r15 0 led3 led2 led1 vcc vcc sw3 tp_gp2 bit0 bit1 bit2 bit3 bit4 bit5 0 1 tp_gp1 tp_gp0 u1 u2
EV3021DQ-00A ? 1x, 1.5x, 2x auto-adjust charge pump EV3021DQ-00A rev. 1.2 www.monolithicpower.com 3 10/18/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. EV3021DQ-00A bill of materials qty ref value description package manufacturer manufacturer p/n 4 c1,c2,c3,c4 1 f 16v/x7r ceramic cap. sm0603 murata grm188r71c105ka 4 led1~led4 ns no stuff 1 r1 4.22 k ? film res, 1% 603 panasonic erj-3ekf4221v 4 r15~r18 0 ? film res, 5% 603 panasonic erj-3gey0r00v 1 u1 white led driver 3x3 qfn16 mps mp3021dq EV3021DQ-00A pattern generation circuit bill of materials qty ref value description package manufacturer manufacturer p/n 1 c5 1 f 16v/x7r ceramic cap. sm0603 murata grm188r71c105ka 1 sw3 6 pos top slide dip switch dip 12 digi-key ckn1290-nd 1 jp1 dip jumper digi-key wm18533-nd 3 r6,r8,r10 5.1 k ? film res, 1% 603 panasonic erj-3ekf5111v 5 r4,r5,r12, r13,r14 10 k ? film res, 1% 603 panasonic erj-3ekf1002v 3 r7,r9,r11 15 k ? film res, 1% 603 panasonic erj-3ekf1502v 2 sw1,sw2 switch push switch 5mmx5mm digi-key ckn9020-nd 1 u2 microcontroller so -8 microchip pic12f675
EV3021DQ-00A ? 1x, 1.5x, 2x auto-adjust charge pump EV3021DQ-00A rev. 1.2 www.monolithicpower.com 4 10/18/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?bottom layer
EV3021DQ-00A ? 1x, 1.5x, 2x auto-adjust charge pump 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. EV3021DQ-00A rev. 1.2 www.monolithicpower.com 5 10/18/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. quick start guide 1. solder led1 ? led4, and flash led to the board if they are not populated. 2. turn off the power supply. 3. attach the positive terminal of the power supply (2.5v - 5.5v) to the vin. 4. attach the negative terminal of the power supply to gnd pin. 5. set the number of leds by sw3. see table below and make sure it is in position. always set mode bits to ?00? . 0 on/off bit 1-bit 1-bit 2-bits 2-bits 5-bits hc/lc bit led sel bits mode bits brightness bits 12345678910 <0> off <1> on <0> high current <1> low current <23> <00> all on <11> 1 led on <10> 2 leds on <01> 3 leds on <45> <00> bl only <678910> <00000> 1 x max brightness / 32 <10000> 2 x max brightness / 32 <01000> 3 x max brightness / 32 <11000> 4 x max brightness / 32 . . . . . . <11111> max brightness 6. turn on the power supply. 7. push the ?brt up? or ?brt down? button to control the brightness of the leds. one push represents one level brightness change. push and hold the button will continuously increase or decrease the brightness.
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