器件名称: AAT3156ISN-T1
功能描述: High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications
文件大小: 340.51KB 共14页
简 介:AAT3156
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications General Description
The AAT3156 is a low noise, constant frequency charge pump DC/DC converter that uses a trimode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for white LED applications. The AAT3156 is capable of driving six LED channels at a total of 180mA 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 1F flying capacitors and two small 1F capacitors at VIN and VOUT) make this part ideally suited for small, battery-powered applications. AnalogicTech's AS2Cwire (Advanced Simple Serial Control) serial digital input is used to enable, disable, and set current for each LED with a 16-level logarithmic scale plus four low-current settings down to 50A for optimized efficiency, with a low housekeeping current of only 50A. Each output of the AAT3156 is equipped with built-in protection for VOUT short circuit and auto-disable for LED failure conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up. A lowcurrent shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1A. The AAT3156 is available in a Pb-free, space-saving, thermally-enhanced 16-pin 4x4mm QFN package.
Features
ChargePump
VIN Range: 2.7V to 5.5V Fully Programmable Current with Single Wire — 16-Step Logarithmic Scal……
