[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