GM19371
BOOST WHITE LED DRIVER WITH OVP
Description
The GM19371 is a step up DC/DC convert specifically designed to dri...
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...