[Advanced Analog Technology, Inc.]

General Description
The AAT1500 is a step-up converter that provides a solution to drive 1 to 4 white LEDs with a constant current from a Lithium Ion cell, and its switching frequency is fixed at 1 MHz.
The AAT1500 offers a low 0.25V reference, which minimizes power loss in the current setting resistor and improves efficiency. Protection feature includes output over voltage protection. The AAT1500 consists of a 0.1µA shutdown current, and HV internal switch. Input supple range allows operation from 2.6V to 6V.
The AAT1500 is available in 6-pin SOT-26 and 8-pin VQFN-8 package.

Features
● Up to 4 LEDs at 2.8V Supply
● High Efficiency (85%)
● Output Over Voltage Protection
● HV Internal Switch
● 1 MHz PWM Switching Frequency
● Uses Tiny 1 mm Height Inductor
● 2.6V to 6V Input Range
● 0.1µA Shutdown Current
● SOT-26 & VQFN-8 Package Available

Applications
● Palmtops
● MP3 Player
● Digital Still Cameras
● Portable Media Player
● Cell Phones and Smart Phones
● Electronic Information Organizers