AT731
FEATURES
Inherently Matched LED Current High Efficiency: 84% Typical Drives Up to Four LEDs from a 3.2V Supply Drives Up to Eight LEDs from a 5V Supply 36V Rugged Bipolar Switch Fast 1.2MHz Switching Frequency Uses Tiny 1mm Tall Inductors Requires Only 0.22µF Output Capacitor
APPLICATION
Cellular Phones PDAs, Handheld puters Digital Cameras Mp3 Players GPS Receivers
Immense Advance Tech.
DESCRIPTION
The AT731 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-lon cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The output capacitor can be as small as 0.22µF, saving space versus alternative solutions. A low 95m V feedback voltage minimizes power loss for better efficiency.
The AT731 are available in SOT-25 and SOT-353 packages.
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