LM1937 Overview
The LM1937 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.
LM1937 Key Features
- Inherently Matched LED Current
- High Efficiency : 84% Typical
- Drives Up to 4 LEDs from a 3.2V Supply
- Drives Up to 6 LEDs from a 5V Supply
- Power Management IC
- 36V Rugged Bipolar Switch
- Fast 1.2MHz Switching Frequency
- Uses Tiny 1mm Tall Inductors
- Requires Only 0.22µF Output Capacitor
- Moisture Sensitivity Level 3