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AAT3131

AAT
Part Number AAT3131
Manufacturer AAT
Description High Efficiency 1X/1.5X Fractional Charge Pump
Published Apr 30, 2007
Detailed Description AAT3131 High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications General Description The AAT3131 is a l...
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AAT3131
AAT3131

Overview
AAT3131 High Efficiency 1X/1.
5X Fractional Charge Pump for White LED Applications 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) conversion to maximize efficiency for white LED applications.
The device can be used to produce current 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 individually or paralleled for driving higher-current LEDs.
A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and OUT) makes the AAT3131 ideally suited for small battery-powered applications.
Features • • • • • • • • • • • • • • • • ChargePump™ 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 Applications during start-up.
A high charge pump switching www.
DataSheet4U.
com frequency enables the use of very small external • Color (RGB) Lighting capacitors.
A low-current shutdown feature discon• Programmable Current Source nects the load from VIN and reduces quiescent cur• White LED Backlighting rent to less than 1µA.
The AAT3131 is available in • White Photo Flash for Digital Still Cameras a Pb-free 12-pin TSOPJW12 package and is rated over the -40°C to +85°C temperature range.
VIN Range: 2.
7V to 5.
5V <1.
0µA of Shutdown Current 1MHz Switching Frequency White LED Backlighting Fully Independent Display Lighting Dual Mode 1X and 1.
5X Charge Pump for Maximum Efficiency Drives Low-VF and High-VF Type LEDs Up to Three 20mA Outputs Single 30mA Output Multi-Position Logarithmic Scale with Digital Control Lo...


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