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AAT3151B - High Efficiency 1X/1.5X Charge Pump

General Description

The AAT3151B is a low noise, constant frequency charge pump DC/DC converter that uses a dual mode load switch (1X) and fractional (1.5X) charge pump conversion to maximize efficiency for white LED applications.

Key Features

  • VIN Range: 2.7V to 5.5V.
  • Fully Programmable Current with Single Wire.
  • 16-Step Logarithmic Scale.
  • 15/20/30mA Max Current.
  • Four Low-Current Settings Down to 50µA.
  • Low IQ (50µA) for Low-Current Mode.
  • Dual Mode 1X and 1.5X Charge Pump for Maximum Efficiency and VF Coverage.
  • Drives Four Channels of LEDs.
  • No Inductors, Low Noise Operation.
  • 1MHz Constant Switching Frequency.
  • Small.

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DATA SHEET AAT3151B High Efficiency 1X/1.5X Charge Pump For White LED Applications General Description The AAT3151B is a low noise, constant frequency charge pump DC/DC converter that uses a dual mode load switch (1X) and fractional (1.5X) charge pump conversion to maximize efficiency for white LED applications. The AAT3151B is capable of driving four white LEDs at a total of 120mA 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) makes the AAT3151B ideally suited for small battery-powered applications.