DATA SHEET
AAT3158
AAT3158 High Efficiency 1X/1.
5X/2X Charge Pump for White LED Applications
General Description
The AAT3158 is a low noise, constant frequency charge pump DC/DC converter that uses a tri-mode load switch (1X), fractional (1.
5X), and doubling (2X) conversion to maximize efficiency for white LED applications.
The AAT3158 is capable of driving up to four LED channels at 20mA per channel from a 2.
7V to 5.
5V input.
The current sinks 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) make this part ideally suited for small, batterypowered applications.
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