器件名称: AAT3158
功能描述: High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
文件大小: 284.36KB 共11页
简 介:AAT3158
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications General Description
The AAT3158 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 AAT3158 is capable of driving up to four LED channels at 20mA per channel 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 S2Cwire (Simple Serial Control) serial digital input is used to enable, disable, and set current for each LED with 16 settings down to 50A. The low current mode supply current can be as low as 50A to save power. Each output of the AAT3158 is equipped with builtin protection for VOUT short circuit and auto disable for load short-circuit conditions. Built-in soft-start 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 1A. The AAT3158 is available in a Pb-free, space-saving 2.85x3.0mm TSOPJW-12 package.
Features
ChargePump
VIN Range: 2.7V to 5.5V Fully Programmable Current with Single Wire — 16 Current Levels — Four Low Current Settings Down to 50A Low IQ (50A) for Low Curre……
