DATA SHEET
AAT3123/23A/24
High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
General Description
Features
The AAT3123/23A/24 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
to drive up to six 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) make the AAT3123/23A/24 ideally suited
for small battery-powered applications.
• VIN Range: 2.7V to 5.5V
• Dual Mode 1X and 1.5X Charge Pump for Maximum
Efficiency
• Drives Low-VF and High-VF Type LEDs
• Up to Six 20mA Outputs (AAT3124)
• Up to Four 20mA Outputs (AAT3123/23A)
• 32-Position Logarithmic Scale with Digital Control
• Simple Serial Control (S2Cwire) Interface
• Low Noise Constant Frequency Operation
• 1MHz Switching Frequency
• Small Application Circuit
• Regulated Output Current
• Automatic Soft Start
• No Inductors
• IQ
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