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AAT3174

ANALOGICTECH
Part Number AAT3174
Manufacturer ANALOGICTECH
Description High Current LED Flash Driver Charge Pump IC
Published Nov 11, 2006
Detailed Description www.DataSheet4U.com High Current, High Efficiency Charge Pump General Description The AAT3174 is a high output current,...
Datasheet PDF File AAT3174 PDF File

AAT3174
AAT3174

Overview
www.
DataSheet4U.
com High Current, High Efficiency Charge Pump General Description The AAT3174 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 AAT3174 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 AAT3174 is ideally suited for small battery-powered applications.
The AAT3174 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 AAT3174 is available in a Pb-free, thermallyenhanced 12-pin 3x3mm TDFN package and is specified over the -40°C to +85°C temperature range.
AAT3174 Features • • • • • • • • • • ChargePump™ Up to 800mA Output Current Tri-Mode 1X/1.
5X/2X in Current Mode 16 Current Steps Set by S2Cwire 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 Applications • • • • • Camcorders Camera Phones Digital Still Cameras PDAs and Notebook PCs Smart Phones Typical Application C1 1µ...


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