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AAT3156ISN-T1 Datasheet(PDF) 1 Page - Advanced Analog Technology, Inc. |
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AAT3156ISN-T1 Datasheet(HTML) 1 Page - Advanced Analog Technology, Inc. |
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1 / 14 page  General Description The AAT3156 is a low noise, constant frequency charge pump DC/DC converter that uses a tri- mode load switch (1X), fractional (1.5X), and dou- bling (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 high- er-current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at V IN and VOUT) make this part ideally suited for small, battery-powered applications. AnalogicTech's AS 2Cwire™ (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 50µA. Each output of the AAT3156 is equipped with built-in protection for V OUT short circuit and auto-disable for LED failure conditions. Built-in soft-start circuitry pre- vents excessive inrush current during start-up. A low- current shutdown feature disconnects the load from V IN and reduces quiescent current to less than 1µA. The AAT3156 is available in a Pb-free, space-saving, thermally-enhanced 16-pin 4x4mm QFN package. Features •V IN 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 I Q (50µA) for Low Current Mode • Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and V F Coverage • Drives Six Channels of LEDs • Individual 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 Open Circuit • Automatic Soft Start •I Q <1µA in Shutdown • Thermally-Enhanced QFN44-16 Package Applications • Color (RGB) Lighting • Programmable Current Sinks • White LED Backlighting • White Photo Flash for Digital Still Cameras AAT3156 High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications Typical Application C1 1 µF C2 1 µF D1 D2 D3 D4 D5 D6 COUT 1 µF CIN 1 µF 2.7V to 5.5V EN/SET VIN EN/SET C1+ C1- C2+ C2- VOUT D1 D2 D3 D4 D5 D6 GND AAT3156 3156.2005.09.1.2 1 ChargePump™ |
Similar Part No. - AAT3156ISN-T1 |
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Similar Description - AAT3156ISN-T1 |
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