High Efficiency 1X/1.5X Fractional Charge Pump
AAT3123/23A/24
High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
General Description
Features
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Description
AAT3123/23A/24
High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
General Description
Features
ChargePump™
The AAT3123/23A/24 is a low noise, constant frequency charge pump DC/DC converter that uses a
VIN Range: 2.7V to 5.5V Dual Mode 1X and 1.5X Charge Pump for
dual mode load switch (1X) and fractional (1.5X)
Maximum Efficiency
conversion to maximize efficiency for white LED applications. The device can be used to produce
Drives Low-VF and High-VF Type LEDs Up to Six 20mA Outputs (AAT3124)
current levels up to 20mA to drive up to six LEDs
Up to Four 20mA Outputs (AAT3123/23A)
from a 2.7V to 5.5V input. Outputs may be operat-
32-Position Logarithmic Scale with Digital
ed individually or paralleled for driving higher-cur-
Control
rent LEDs. A low external parts count (two 1µF fly-
Simple Serial Control (S2Cwire) Interface
ing capacitors and two small 1µF capacitors at VIN and OUT) make the AAT3123/23A/24 ideally su...
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