AAT3151 High Efficiency 1X/1.5X/2X Charge Pumpwith PWM Control for White LED Applications

The AAT3151 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 device produces current levels up to 30mA on each of its three current source outputs to drive various arrangements of LEDs from a 2.7V to 5.5V input. Outputs 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 CP) make the AAT3151 ideally suited for small battery-powered applications. Skyworks' Simple Serial Control™ (S2Cwire™) digital input is used to enable, disable, and set the LED drive current with a 32-level logarithmic scale LED brightness control. The AAT3151 has a thermal management system to protect the device in the event of a short-circuit condition at an output pin. Built-in soft-start circuitry prevents excessive inrush current during start-up. A high charge pump switching frequency enables the use of very small external capacitors. In shutdown mode, the device disconnects the load from VIN and reduces quiescent current to less than 1μA. The AAT3151 is available in the very small, Pb-free 12-pin TSOPJW package.

技术特性

VIN Range: 2.7V to 5.5V
Fully Programmable Current with Single Wire
16-Step Logarithmic Scale
15/20/30mA Max Current
Four Low-Current Settings Down to 50μA
Low IQ (50μA) for Low-Current Mode
Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and VF Coverage
Drives Four Channels of LEDs
ndividual Main/Sub-Group Control
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
TDFN33-12 or STDFN33-12 Package

应用领域 APPLICATION

Programmable Current Sources
White LED Backlighting
White Photo Flash for Digital Still Cameras

订购信息 Ordering Information

AAT3151

AAT3151 典型应用

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
AAT3151 数据资料DataSheet下载:pdf	Rev.V2	2 页