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AAT3113 Datasheet(PDF) 1 Page - Advanced Analog Technology, Inc. |
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AAT3113 Datasheet(HTML) 1 Page - Advanced Analog Technology, Inc. |
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1 / 15 page  AAT3113, AAT3114/14A High Efficiency 1.5X Fractional Charge Pumps For White LED Applications Typical Application CIN 1 μF VBATTERY COUT 1 μF EN/SET C1 1 μF C2 1 μF D4 D3 D2 D1 VIN OUT C1+ C1- C2+ C2- D1 D2 D3 D4 EN/SET GND AAT3114/14A D5 D6 D5 D6 3113.2006.07.1.9 1 ChargePump™ General Description The AAT3113 and AAT3114/14A are low noise, con- stant frequency charge pump DC/DC converters that use fractional (1.5X) conversion to increase effi- ciency in white LED applications. The devices can be used to produce current levels up to 20mA for each output from a 2.7V to 5.5V input. A low exter- nal parts count (two 1µF flying capacitors and two small bypass capacitors at VIN and OUT) makes these devices ideally suited for small, battery-pow- ered applications. AnalogicTech’s Simple Serial Control™ (S2Cwire™) interface is used to enable, disable, and set the LED drive current for 32-level logarithmic scale LED brightness control. AAT3113 and AAT3114/14A devices have a thermal management system for protection in the event of a short-circuit condition on any of the output pins. Built-in soft-start circuitry prevents excessive inrush current during start-up. A high switching frequency enables the use of small external capacitors. A low-current shutdown feature disconnects the load from VIN and reduces quies- cent current to less than 1µA. The AAT3113 pro- vides four LED current source outputs, and the AAT3114/14A provides six. The AAT3113 is avail- able in a Pb-free 12-pin TSOPJW package, and the AAT3114/14A is available in a Pb-free 16-pin QFN package. Features • AAT3113: Four Outputs • AAT3114/14A: Six Outputs • 20mA Full-Scale Current • Simple Serial Control (S2Cwire) Interface — 32-Position Logarithmic Scale with Digital Control • Low Noise Constant Frequency Operation • 33% Less Input Current Than Doubler Charge Pump • High Accuracy Brightness Matching • Small Application Circuit • Regulated Output Current • Automatic Soft Start •VIN Range: 2.7V to 5.5V • No Inductors • 600kHz Switching Frequency •IQ <1µA in Shutdown • Temperature Range: -40°C to 85°C • 12-Pin TSOPJW Package (AAT3113) • 16-Pin QFN Package (AAT3114/14A) Applications • Programmable Current Source • White LED Backlighting |
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