Description

The GM1937 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current.

The device can drive two, three or four LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors.

Features

◆ High Efficiency: 84 Typical

◆ 36V internal Switch

◆ Fast 1.2MHz Switching Frequency

◆ Drives Up to three LEDs from a 2.8V Supply

◆ Drives Up to six LEDs from a 5V Supply

◆ External Matched LED Current

◆ Uses Tiny 1mm height inductor

◆ Requires Only 0.22 F Output Capacitor

◆ Low profile TSOT package

Application

Cellular Phones

PDA, Handheld Computers

Digital Cameras

MPS3 Players

GPS Receivers