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AAT3369-1 - 1X/1.5X Charge Pump

General Description

The AAT3369-1 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 CABC (Content Adaptive Brightness Control) applications.

Key Features

  • 2.7V to 5.5V Supply Voltage Range.
  • Drives up to 6 LEDs with up to 21mA each.
  • 126mA of Total Drive Current.
  • Charge Pump with Automatic Switching Between 1x and 1.5x Modes.
  • Linear LED Output Control.
  • S2C Interface: 32 Steps from 21mA to 0.3mA.
  • PWM Interface: Up to 100kHz from 1% to 100% Duty Cycle.
  • < 1.0µA Input Current in Shutdown.
  • Small.

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Full PDF Text Transcription (Reference)

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DATA SHEET AAT3369-1 High Efficiency, Six-Channel, 1X/1.5X Charge Pump for White LED Applications General Description The AAT3369-1 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 CABC (Content Adaptive Brightness Control) applications. The AAT3369-1 is capable of driving 6 white LEDs at a total 126mA in a wide input range. 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 IN and OUTCP) makes the AAT3369-1 ideally suited for small battery-powered applications.