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AAT3153 Datasheet(PDF) 1 Page - Advanced Analog Technology, Inc. |
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AAT3153 Datasheet(HTML) 1 Page - Advanced Analog Technology, Inc. |
1 / 14 page AAT3153 High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications 3153.2005.12.0.93 1 ChargePump™ General Description The AAT3153 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 AAT3153 is capable of driving six LED channels 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 1µF flying capacitors and two small 1µF capacitors at V IN and VOUT) makes this part ideally suited for small, battery-powered applications. AnalogicTech's S 2Cwire™ (Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with eight settings (20mA down to 50µA) including main and sub-display group control. The AAT3153 consumes extremely low current internally (50µA typical) at light load for optimized efficiency. Each output of the AAT3153 is equipped with built- in protection for V OUT 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 discon- nects the load from V IN and reduces quiescent cur- rent to less than 1µA. The AAT3153 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 — Eight-Step Current: 20mA to 50µA — Individual Main-Sub Group Control — Low I Q (50µA) at Light Load • Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and V F Coverage • Drives Up to Six LED Channels • 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 •I Q <1µA in Shutdown • Thermally-Enhanced 4x4mm 16-Pin QFN Package Applications • Color (RGB) Lighting • Programmable Current Sinks • White LED Backlighting • White Photo Flash for Digital Still Cameras 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 AAT3153 |
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