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AAT3151BIWP-T1 Datasheet(PDF) 1 Page - Advanced Analogic Technologies |
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AAT3151BIWP-T1 Datasheet(HTML) 1 Page - Advanced Analogic Technologies |
1 / 13 page AAT3151B High Efficiency 1X/1.5X Charge Pump For White LED Applications ChargePumpTM PRODUCT DATASHEET 3151B.2008.02.1.1 1 www .analogictech.com General Description The AAT3151B is a low noise, constant frequency charge pump DC/DC converter that uses a dual mode load switch (1X) and fractional (1.5X) charge pump conver- sion to maximize efficiency for white LED applications. The AAT3151B is capable of driving four white 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 driv- ing higher-current LEDs. A low external parts count (two 1μF flying capacitors and two small 1μF capacitors at VIN and VOUT) makes the AAT3151B 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 50μA. The charge pump output of the AAT3151B is equipped with built-in protection for VOUT. Each current sink input has short-circuit and auto-disable to guard against LED failure 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 1μA. The AAT3151B is available in a Pb-free, space-saving, thermally-enhanced, 12-pin 3x3mm TDFN package. Features • VIN 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 IQ (50μA) for Low-Current Mode • Dual Mode 1X and 1.5X Charge Pump for Maximum Efficiency and VF Coverage • Drives Four Channels of LEDs • 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 • IQ <1μA in Shutdown • TDFN33-12 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 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 GND AAT3151B |
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