EV0062 (mp1541) 1.3mhz low power led torch/flash driver evaluation board - initial release 06/04, rev. 1.0 www.monolithicpower.com 1 monolithic power systems general description the EV0062 is an evaluation board designed to drive up to four (4) white leds in series. the board is based on mps? mp1541 sot23 current mode step up converter. the mp1541 is intended for small, low power applications. the mp1541 switches at 1.3mhz and allows the use of tiny, low cost capacitors and inductors 2mm or less in height. internal soft start results in small inrush current and extends the battery life. the mp1541 operates from an input voltage as low as 2.5v and can generate 12v at up to 200ma from a 5v supply. the mp1541 includes under-voltage lockout, current limiting and thermal overload protection preventing damage in the event of an output overload. the mp1541 is available in a small 5-lead tsot23 package. electrical specification parameter symbol value units supply voltage v in 2.5 ? 6 v led current (torch) i out 1 20 ma led current (flash) i out 2 100 ma features ? on board power mosfet ? uses tiny capacitors and inductors ? 1.3mhz fixed switching frequency ? internally compensated ? internal soft start ? operates with input voltage as low as 2.5v and output voltage as high as 22v ? 12v at 200ma from 5v input ? uvlo, thermal shutdown ? internal current limit ? available in a tsot23-5 package applications ? camera phone flash ? handheld computers and pdas ? digital still and video cameras ? external modems ? small lcd displays ? white led driver , ?mps?, ?monolithic power systems? , and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. EV0062 evaluation board (2.5?x x 2.5?y x 0.8?z) board number mps ic number EV0062 rev. b mp1541 0 0 v flash 2v/div. v out 5v/div. v in = 3.6v (3 leds) EV0062_mp1541_tac_ec01 waveform in flash mode
EV0062 (mp1541) 1.3mhz low power torch/flash led driver evaluation board - initial release 06/04, rev. 1.0 www.monolithicpower.com 2 evaluation board schematic EV0062 bill of materials qty ref description package manufacturer p/n distributor p/n (1) 1 c1 ceramic capacitor, 10uf, 10v, x5r 1210 panasonic: ecj-4yb1a106k pcc2170ct-nd 1 c2 ceramic capacitor, 1uf, 16v, x5r 1206 panasonic: ecj-3yb1c105k pcc1882ct-nd 1 d1 schottky diode, 0.5a, 20v sod- 123 fairchild: mbr0520l mbr0520lct-nd 1 l1 inductor, 10uh, 1.7a sumida: cdrh6d28-100nc 1 q1 n-channel mosfet, 60v, 3a sot23- 6 zetex: zxmn6a08e6ta zxmn6a08e6ct-nd 1 u1 1.3mhz boost converter sot23-5 mps: mp1541 1 r1 resistor, 100k ? , 5% 0603 panasonic: erj-6enf1003v p100kcct-nd 1 r2 resistor, 470k ? , 5% 0603 panasonic: erj-6geyj474v p470kact-nd 1 r3 resistor, 61.9 ? , 1% 0603 panasonic: erj- 6enf61r9v p61.9cct-nd 1 r4 resistor, 15.4 ? , 1% 0603 panasonic: erj- 6enf15r4v p15.4cct-nd 1 led1 flash led (2) 1 led2 flash led (2) 1 led3 flash led (2) 1 led4 flash led (2) note 1) distributor: digikey 2) not included with board. v out d1 mbr0520l mp1541 sw in 51 3 4 2 fb gnd en q1 v in 5v en gnd gnd led1 led2 led3 led4 flash EV0062_mp1541_sch01
EV0062 (mp1541) 1.3mhz low power torch/flash led driver evaluation board - initial release 06/04, rev. 1.0 www.monolithicpower.com 3 printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3? bottom layer
EV0062 (mp1541) 1.3mhz low power torch/flash led driver evaluation board - initial release notice: mps believes the information in this document to be accurate and reliable. however, it is subject to change without notice. contact mps for current specificat ions. mps encourages users of its products to ensure that third party intellectual property rights are not infringed upon wh en integrating mps products into any app lication. mps cannot assume any legal responsibility for any said applications. EV0062 (mp1541) rev. 1.0 monolithic power systems, inc. 4 6/10/04 983 university avenue, building a, los gatos, ca 95032 usa ? 2004 mps, inc. tel: 408-357-6600 ? fax: 408-357-6601 ? www.monolithicpower.com quick start guide 1. connect leds to led1 ? led4 terminals. 2. preset power supply to 2.5v ? 6v. 3. turn off power supply. 4. connect power supply terminals to: a. positive (+): vin b. negative (?): gnd 5. turn power supply on after making connections. 6. the mp1541 is automatically enabled on the demo board once v in is applied. 7. drive flash of q1 with a pulsed signal (3v or above for high, 0v for low) to switch between two (2) led currents. 8. i out 1 is set to 20ma on the board. 9. i out 2 is set to 100ma on the board.
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