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AAT3143

AAT
Part Number AAT3143
Manufacturer AAT
Description High Efficiency 1X/1.5X/2X Charge Pump
Published Apr 30, 2007
Detailed Description High Efficiency 1X/1.5X/2X Charge Pump with PWM Control for White LED Applications General Description The AAT3143 is a ...
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AAT3143
AAT3143

Overview
High Efficiency 1X/1.
5X/2X Charge Pump with PWM Control for White LED Applications General Description The AAT3143 is a low noise, constant frequency charge pump DC/DC converter that uses a trimode load switch (1X), fractional (1.
5X), and doubling (2X) conversion to maximize efficiency for white LED applications.
The AAT3143 can deliver current levels up to 80mA to drive white LEDs connected to the four current source outputs from a 2.
7V to 5.
5V input.
The current source outputs may source up to 20mA each and may be operated individually or in parallel for driving higher-current LEDs.
A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and VOUT) makes the AAT3143 ideally suited for small battery-powered applications.
Output current, and therefore brightness, is controlled via externally applied Pulse Width Modulation (PWM) control.
Typically, PWM frequencies of up to 50kHz can be applied.
The AAT3143 has a thermal management system to protect the d...


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