Description

    AT8821 is a DC/DC step-up converter that delivers an accurate constant current for driving LEDs. Operation at a fixed switching frequency of 1MHz allows the device to be used with small value external ceramic capacitors and inductor. LEDs connected in series are driven with a regulated current set by the external resistor. The AT8821 is ideal for driving up to eight white LEDs in series or up to 30V.

Features

 Input voltage range 2.5V to 30V

Switch current limit 2A

Drives LED strings up to 30V 

1MHz fixed frequency minimizes the external components

Internal softstart limits the inrush current

Open LED overvoltage protection

RoHS Compliant and Halogen Free

Compact package: SOT23-6 pin

Applications

GPS Navigation ATstems

Handheld Devices

Portable Media Players

Typical Applications