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AAT3131ITP-T1 Datasheet(PDF) 1 Page - Advanced Analogic Technologies |
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AAT3131ITP-T1 Datasheet(HTML) 1 Page - Advanced Analogic Technologies |
1 / 14 page AAT3131 High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications 3131.2004.08.1.1 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. Low external parts counts (two 1µF flying capacitors and two small 1µF capacitors at VIN, and OUT) make the AAT3131 ideally suited for small battery-powered applications. AnalogicTech™'s Simple Serial Control™ (S2Cwire™) 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 logarithmic scales. The AAT3131 has a thermal management 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 frequency enables the use of very small external capacitors. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA. The AAT3131 is available in very small 12 pin TSOPJW12 package. Features •VIN Range: 2.7 - 5.5 Volts • < 1.0µA of Shutdown current • 1.0 MHz Switching Frequency • White LED Backlighting • Fully Independent Display Lighting • Dual Mode 1x and 1.5x Charge Pump for Maximum Efficiency • Drives Low-VF & High-VF f Type LED's • Up to three 20mA Outputs • Single 30 mA Output • Multi Position Logarithmic Scale with Digital Control • Low Noise Constant Frequency Operation • Regulated Output Current • Automatic Soft-Start • No Inductors • -40 to +85°C Temperature Range • 12 pin TSOPJW-12 package Applications • White LED Backlighting • White Photo-Flash for DSC's • Color (RGB) Lighting • Programmable Current Source 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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