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AAT3140ITP-T1 Datasheet(PDF) 1 Page - Advanced Analog Technology, Inc. |
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AAT3140ITP-T1 Datasheet(HTML) 1 Page - Advanced Analog Technology, Inc. |
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1 / 16 page  AAT3140 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications 3140.2007.03.1.3 1 ChargePump™ General Description The AAT3140 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 appli- cations. The device produces current levels up to 30mA on each of its four current source outputs to drive various arrangements of LEDs from a 2.7V to 5.5V input. Outputs 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 CP) make the AAT3140 ide- ally suited for small battery-powered applications. The AAT3140 is equipped with AnalogicTech’s unique AutoBias™ technology which allows individual LEDs to be powered either by charge pump or battery input, determined internally and automatically to maximize the power efficiency even with a large difference in LED forward voltage. AnalogicTech's Simple Serial Control™ (S 2Cwire™) digital input is used to enable, disable, and set the LED drive current with a 32-level logarithmic scale LED brightness control. The AAT3140 has a thermal management system to protect the device in the event of a short-circuit condition at an output pin. Built-in soft- start circuitry prevents excessive inrush current during start-up. A high charge pump switching frequency enables the use of very small external capacitors. In shutdown mode, the device disconnects the load from V IN and reduces quiescent current to less than 1µA. The AAT3140 is available in the very small, Pb-free 12-pin TSOPJW package. Features •V IN Range: 2.7V to 5.5V • Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and V F Coverage • Drives Low-V F and High-VF Type LEDs • Up to Four 30mA Outputs • 32-Position Logarithmic Scale with Digital Control • Low Noise Constant Frequency Operation • 1MHz Switching Frequency • AutoBias Technology • Small Application Circuit • Regulated Output Current • Automatic Soft Start • No Inductors •I Q < 1µA in Shutdown • 12-Pin TSOPJW Package Applications • Color (RGB) Lighting • Programmable Current Sources • White LED Backlighting • White Photo Flash for Digital Still Cameras Typical Application CIN 1 μF VBATTERY CCP 1 μF EN/SET C1 1 μF C2 1 μF D3 D2 D1 VIN CP C1+ C1- C2+ C2- D1 D2 D3 D4 EN/SET GND AAT3140 D4 |
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