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AAT3172 Datasheet(PDF) 1 Page - Advanced Analog Technology, Inc. |
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AAT3172 Datasheet(HTML) 1 Page - Advanced Analog Technology, Inc. |
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1 / 15 page  General Description The AAT3172 is a high output current, high effi- ciency, low noise, low profile charge pump DC/DC converter, ideal for multi-function LED photo-flash applications where solution cost, size, and efficien- cy are critical. The dual charge pump in the AAT3172 is capable of delivering 600mA output current. Two current- controlled paths are available for users of dual flash LEDs that prefer current matching. Each LED channel can be easily programmed in 32 steps with a single GPIO output through the AS2Cwire™ (Advanced Simple Serial Control™) interface. This allows smooth transitions and flexible adjustment of brightness in flash or other lighting modes. The tri-mode (1X/1.5X/2X) operation of the internal charge pump offers excellent power efficiency for both flash and movie modes. Combined with a low external parts count (two 1µF flying capacitors and one small bypass capacitor at VIN and OUT), the AAT3172 is ideally suited for small, battery-powered applications. The AAT3172 has a thermal management system to protect the device in the event of a short-circuit con- dition at the output pin. Built-in soft-start circuitry prevents excessive inrush current during start-up. The shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1.0µA. The AAT3172 is available in the Pb-free, thermally- enhanced, 12-pin 3x3mm TDFN package. Features •VIN Range: 2.7V to 5.5V • 600mA Output Current • Tri-Mode 1X/1.5X/2X in Current Mode • Voltage Mode Operation: 1.5X, 100mA • Dual Regulated Current Sinks • Current Match Between Current Sinks • 32 Current Steps Set by AS2Cwire • 1µF Input, Output, and Flying Capacitors • <1.0µA of Shutdown • Small Application Circuit • No Inductors • Automatic Soft Start • 12-Pin TDFN 3x3mm Package • -40°C to +85°C Temperature Range Applications • Camera Phones • Digital Still Cameras (DSCs) • PDAs and Notebook PCs • Smart Phones AAT3172 High Current LED Flash Driver Charge Pump IC Typical Application AAT3172 C OUT 2.2 μF EN/SET V IN C1+ C1- C2+ C2- V OUT F1 F2 2.7V to 5.5V EN/SET Flash LED 1 Flash LED 2 GND C IN 4.7 μF C1 1 μF C2 1 μF 3172.2006.05.1.5 1 ChargePump™ |
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