Advanced Analogic Technologies AAT3151
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 AAT3151 is capable of driving four-channel LEDs at a total of 120mA from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher-current LEDs.| Part No. | AAT3151 |
|---|---|
| Datasheet | AAT3151 Download |
| Manufacturer |  Advanced Analogic Technologies |
| Description | High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications |
| Buy | Stock & Price |
APPLICATIONS
GENERAL DESCRIPTION
A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and VOUT) makes the AAT3151 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 50µA for optimized efficiency, with a low housekeeping current of only 40µA. Each output of the AAT3151 is equipped with builtin protection for VOUT short-circuit and auto-disable for LED failure condition. 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 1µA. The AAT3151 is available in a space-saving, thermally-enhanced, 12-pin 3x3mm DFN package.FEATURES
●● ChargePump™
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● VIN Range: 2.7V to 5.5V Fully Programmable Current...
