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AAT3194

AAT
Part Number AAT3194
Manufacturer AAT
Description High Efficiency 1.5X Fractional Charge Pump
Published Jul 23, 2007
Detailed Description High Efficiency 1.5X Fractional Charge Pump For White LED Applications General Description The AAT3194 is a low noise, c...
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AAT3194
AAT3194

Overview
High Efficiency 1.
5X Fractional Charge Pump For White LED Applications General Description The AAT3194 is a low noise, constant frequency charge pump DC/DC converters that use fractional (1.
5X) conversion to increase efficiency in white LED applications.
The devices can be used to produce current levels up to 20mA for each output from a 2.
7V to 5.
5V input.
A low external parts count (two 1µF flying capacitors and two small bypass capacitors at IN and OUT) makes these devices 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 for 32-level logarithmic scale LED brightness control.
The AAT3194 has a thermal management system for protection in the event of a short-circuit condition on any of the output pins.
Built-in soft-start circuitry prevents excessive inrush current during start-up.
A high switching frequency enables the use of small external capacitors.
A lowcurrent shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA.
The AAT3194 is available in a Pb-free 12-pin TSOPJW package.
AAT3194 Features • • • • • • • • • • • • • • ChargePump™ VIN Range: 2.
7V to 5.
5V 20mA Full-Scale Current Simple Serial Control (S2Cwire) Interface — 32-Position Logarithmic Scale with Digital Control Low Noise Constant Frequency Operation 33% Less Input Current Than Doubler Charge Pump High Accuracy Brightness Matching Small Application Circuit Regulated Output Current Automatic Soft Start No Inductors 600kHz Switching Frequency IQ <1µA in Shutdown Temperature Range: -40°C to 85°C 12-Pin TSOPJW Package Applications • • Programmable Current Source White LED Backlighting www.
DataSheet4U.
com Typical Application IN C1+ C1 1µF OUT VBATTERY CIN 1µF COUT 1µF C1C2+ C2 1µF AAT3194 C2D1 D2 D3 EN/SET EN/SET GND D4 D4 D3 D2 D1 3194.
2006.
09.
1.
0 1 High Efficiency 1.
5X Fractional Charge Pump For White LED Applications Pin Descript...


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