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White LED Step-Up Converter

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FEATURES
- Inherently Matched LED Current
- High Efficiency: 84% Typical
- Drives Up to Four LEDs from a 3.2V Supply
- Drives Up to Six LEDs from a 5V Supply
- 36V Rugged Bipolar Switch
- Fast 1.2MHz Switching Frequency
- Uses Tiny 1mm Tall Inductors
- Requires Only 0.22F Output Capacitor
- Moisture Sensitivity Level 3
DESCRIPTION
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

LM1937

SOT23_5LD
resulting in uniform brightness and eliminating the need for ballast resistors. The output capacitor can be as small as 0.22F, saving space versus alternative solutions. A low 95mV feedback voltage minimizes power loss for better efficiency.

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