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AAT3131 Datasheet(PDF) 1 Page - Advanced Analog Technology, Inc. |
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AAT3131 Datasheet(HTML) 1 Page - Advanced Analog Technology, Inc. |
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1 / 14 page  AAT3131 High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications 3131.2005.12.1.2 1 ChargePump™ General Description The AAT3131 is a low noise, constant frequency charge pump DC/DC converter that uses a dual mode load switch (1X) and fractional (1.5X) con- version to maximize efficiency for white LED appli- cations. The device can be used to produce cur- rent levels up to 20mA in three of its outputs and 30mA in one of its outputs to drive LEDs from a 2.7V to 5.5V input. Outputs may be operated indi- vidually or paralleled for driving higher-current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at V IN and OUT) makes the AAT3131 ideally suited for small battery-powered applications. AnalogicTech's Simple Serial Control™ (S 2Cwire™) interface is used to enable, disable, and set the LED drive current in two groups: the three 20mA outputs and the single 30mA output with multiple level loga- rithmic scales. The AAT3131 has a thermal man- agement system to protect the device in the event of a short-circuit condition at the output pin. Built-in soft-start circuitry prevents excessive inrush current during start-up. A high charge pump switching fre- quency enables the use of very small external capacitors. A low-current shutdown feature discon- nects the load from V IN and reduces quiescent cur- rent to less than 1µA. The AAT3131 is available in a Pb-free 12-pin TSOPJW12 package and is rated over the -40°C to +85°C temperature range. Features •V IN Range: 2.7V to 5.5V • <1.0µA of Shutdown Current • 1MHz Switching Frequency • White LED Backlighting • Fully Independent Display Lighting • Dual Mode 1X and 1.5X Charge Pump for Maximum Efficiency • Drives Low-V F and High-VF Type LEDs • Up to Three 20mA Outputs • Single 30mA Output • Multi-Position Logarithmic Scale with Digital Control • Low Noise Constant Frequency Operation • Regulated Output Current • Automatic Soft Start • No Inductors • Temperature Range: -40°C to +85°C • 12-Pin TSOPJW Package Applications • Color (RGB) Lighting • Programmable Current Source • White LED Backlighting • White Photo Flash for Digital Still Cameras Typical Application CIN 1 µF VBATTERY COUT 1 µF EN/SET C1 1 µF C2 1 µF D5 D3 D2 D1 VIN VOUT C1+ C1- C2+ C2- D1 D2 D3 D4 EN/SET GND AAT3131 D4 |
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