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AAT3177 Dataheets PDF



Part Number AAT3177
Manufacturers Advanced Analogic Technologies
Logo Advanced Analogic Technologies
Description High Efficiency Charge Pump
Datasheet AAT3177 DatasheetAAT3177 Datasheet (PDF)

PRODUCT DATASHEET www.DataSheet4U.com AAT3177 High Current, High Efficiency Charge Pump with Auto-Timer Features • • • • • • • • • • • Up to 800mA Output Current Tri-Mode 1X/1.5X/2X in Current Mode 16 Current Level Steps Set by S2Cwire Flash Auto-Timer (Active for High Current Levels Only) External RSET to Set Maximum Current <1μA of Shutdown Small Application Circuit No Inductors Automatic Soft Start 12-Pin TDFN 3x3mm Package -40°C to +85°C Temperature Range ChargePumpTM General Description .

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PRODUCT DATASHEET www.DataSheet4U.com AAT3177 High Current, High Efficiency Charge Pump with Auto-Timer Features • • • • • • • • • • • Up to 800mA Output Current Tri-Mode 1X/1.5X/2X in Current Mode 16 Current Level Steps Set by S2Cwire Flash Auto-Timer (Active for High Current Levels Only) External RSET to Set Maximum Current <1μA of Shutdown Small Application Circuit No Inductors Automatic Soft Start 12-Pin TDFN 3x3mm Package -40°C to +85°C Temperature Range ChargePumpTM General Description The AAT3177 is a high output current, high efficiency, low noise, low profile charge pump DC/DC converter. The device is ideal for multi-functional LED photo-flash applications where solution cost, size, and efficiency are critical. The AAT3177 is capable of driving a regulated output current up to 800mA. Output current levels can be easily programmed in 16 steps through AnalogicTech’s Simple Serial Control™ (S2Cwire™) interface controlled by a single microcontroller GPIO line. This allows smooth transitions and flexible adjustment of brightness in flash or other lighting modes. The maximum output current can also be set with an external RSET resistor. The tri-mode (1X/1.5X/2X) operation of the internal charge pump offers excellent power efficiency throughout the output current range for both flash and movie modes. Combined with a low external parts count (two 1μF flying capacitors and two small bypass capacitors at VIN and OUT), the AAT3177 is ideally suited for small battery-powered applications. The AAT3177 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. The shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1μA. The AAT3177 is available in a Pb-free, thermallyenhanced 12-pin 3x3mm TDFN package and is specified over the -40°C to +85°C temperature range. Applications • • • • • Camcorders Camera Phones Digital Still Cameras PDAs and Notebook PCs Smart Phones Typical Application 1μF 1μF C1+ 2.7V to 5.5V CIN 4.7μF C1- C2+ C2+ OUT VIN AAT3177 EN/SET CT GND COUT 2.2μF Flash LED EN FL RSET 187K 0.1μF 3177.2008.06.1.0 www.analogictech.com 1 PRODUCT DATASHEET www.DataSheet4U.com AAT3177 High Current, High Efficiency Charge Pump with Auto-Timer Function Input power supply pin. Connect Pin 1 directly to Pin 12 and then to input supply voltage. Connect a 4.7μF or larger ceramic capacitor to ground. Flying capacitor C1 positive terminal. Connect a 1μF ceramic capacitor between C1+ and C1-. Flying capacitor C1 negative terminal. Ground connection. Controlled current sink. Connect the flash LED cathode to this pin. Connect resistor here to set maximum output current. Charge pump enable / set input control pin. When in the low state, the AAT3177 is powered down and consumes less than 1μA. When connected to logic high level, the AAT3177 charge pump is active. This pin s.


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