AAT3175 High Efficiency 1X/1.5X/2X Charge Pump for White LED Flash Applications

The AAT3175 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 flash applications. The AAT3175 is capable of driving up to three flash LEDs at 300mA total current from a 2.7V to 5.5V input. A low external parts count (two 1μF flying capacitors and two small 1μF capacitors at VIN and VOUT) make this part ideally suited for small battery-powered applications. SKYWORKS’ S2Cwire™ (Simple Serial Control™) serial digital input is used to enable, disable, and set current for all LEDs with 16 level settings down to 0. The AAT3175 is equipped with built-in protection for VOUT short-circuit condition and auto-disable for load shortcircuit condition on any one of the channels. Built-in softstart circuitry prevents excessive inrush current during start-up. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1μA. The AAT3175 is available in a Pb-free, space-saving, thermally-enhanced 12-pin 3x3mm TDFN package.

技术特性

VIN Range: 2.7V to 5.5V
Up to 300mA Total Flash Current
Fully Programmable Current with Single Wire
16 Logarithmic Current Levels
Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum
Efficiency and VF Coverage
Drives 3-in-1 or 2-in-1 Flash LEDs
0.5% Current Matching
No Inductors, Low Noise Operation
1MHz Constant Switching Frequency
Small Application Circuit
Built-In Thermal Protection
Automatic Soft-Start
IQ <1μA in Shutdown
TDFN33-12 Package

订购信息 Ordering Information

AAT3175

应用领域 APPLICATION

Programmable Current Sinks
White LED Backlighting
White Photo Flash for Mobile Phones

功能框图 Functional Block Diagram

应用技术支持与电子电路设计开发资源下载	版本信息	大小
AAT3175 数据资料DataSheet下载:pdf	Rev.V2	2 页