AAT3153中文資料研諾科技數(shù)據(jù)手冊PDF規(guī)格書

General Description

The AAT3153 is a low noise, constant frequency charge pump DC/DC converter that uses a tri-mode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for white LED applications. The AAT3153 is capable of driving six LED channels from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher current LEDs. A low external parts count (two 1μF flying capacitors and two small 1μF capacitors at VIN and VOUT) makes this part ideally suited for small, battery-powered applications.

Features

? VIN Range: 2.7V to 5.5V

? Fully Programmable Current with Single Wire

— Eight-Step Current: 20mA to 50μA

— Individual Main-Sub Group Control

— Low IQ (50μA) at Light Load

? Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and VF Coverage

? Drives Up to Six LED Channels

? No Inductors, Low Noise Operation

? 1MHz Constant Switching Frequency

? Small Application Circuit

? Built-In Thermal Protection

? Built-In Auto-Disable for Short-Circuit

? Automatic Soft Start

? IQ <1μA in Shutdown

? Thermally-Enhanced 4x4mm 16-Pin QFN Package

Applications

? Color (RGB) Lighting

? Programmable Current Sinks

? White LED Backlighting

? White Photo Flash for Digital Still Cameras