AAT3157 Overview
The AAT3157 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 AAT3157 is capable of driving up to three channels of LEDs 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.
AAT3157 Key Features
- VIN Range: 2.7V to 5.5V
- Fully Programmable Current with Single Wire
- 16 Current Levels
- Four Low Current Settings Down to 50µA
- Low IQ (50µA) for Low Current Mode
- Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum
- Drives up to Three Channels of LEDs
- No Inductors, Low Noise Operation
- 1MHz Constant Switching Frequency
- Small Application Circuit
AAT3157 Applications
- VIN Range: 2.7V to 5.5V
- Fully Programmable Current with Single Wire
