Advanced Analog Technology, Inc.
July 2008
AAT1500
Product information presented is current as of publication date. Details are subject to change without notice
CONSTANT CURRENT BOOST CONVERTER
FOR 1 TO 4 WHITE LEDS
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
SOT23-5 , SOT23-6,TSOT23-6, and VSON8
Packages Available
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 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. Except in SOT23-5 package,
protection
features
include
output
over
voltage
protections. The AAT1500 consists of a 0.1µA shutdown
current, and HV internal switch. Input supply range
allows operation from 2.6V to 6V.
The AAT1500 is available in SOT23-5, SOT23-6,
TSOT23-6 and VSON8 packages.
APPLICATIONS
Palmtops
MP3 Player
Digital Still Cameras
Portable Media Player
Cell Phones and Smart Phones
Electronic Information Organizers
PIN CONFIGURATION
TYPICAL APPLICATION
V
R
1
=
IE
I
R1
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Advanced Analog Technology, Inc. –
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