GM19371

GM19371 BOOST WHITE LED DRIVER WITH OVP Description The GM19371 is a step up DC/DC convert specifically designed to drive white LED;s with a constant current. The device can drive up to 27 LEDs from a 5V supply. Additional feature includes output voltage limiting when LEDs are disconnected. GM19371 is available in SOT-26 package. Features ‹ ‹ ‹ ‹ ‹ Inherently matched LED current Drives up to 126LEDs (9S14P) from a 12V supply 36V rugged bipolar switch Fast 1.2MHz switching frequency Over Voltage Protection, 30V Application Cellular phones PDAs, Handheld Computers Digital Cameras MP3 Player GPS Receivers MR16 Lighting Typical Application Circuits 10µH VIN 6V to 18V C1 4.7µF 6 VIN 1 SW OVP 5 D1 14 Strings in Parallel 9 LED in Series C2 4.7µF GM19371 4 CTRL GND 2 FB 3 RSET 20mA x 14 DIM Figure 1 GM19371 typical application www.gammamicro.com.tw 1 Free Datasheet http://www.datasheet4u.com/ GM19371V2.01 GM19371 BOOST WHITE LED DRIVER WITH OVP Marking Information and Pin Configurations (Top View) SOT26 VIN 6 OVP 5 CTRL 4 70YWW 1 SW 2 GND 3 FB 70: Device Code, Green Product Y: Year WW: Week code Pin Descriptions Pin Number 1 2 3 Pin Name SW GND FB Pin Function This is the collector of the internal NPN power switch. Connect to inductor and diode. Minimize the metal trace area connected to this pin to reduce EMI. Ground Reference voltage is 95mV. Connect LEDs and a resistor at this pin. LED current is determined by the resistance and CTRL voltage. RSET resistor va...