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AAT2869 - constant-frequency charge pump DC/DC converter

General Description

The AAT2869 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 AAT2869 is capable of driving 4 white LEDs at a total of 124mA from a 2.7V to 5.5V input.

Key Features

  • 2.7V to 5.5V Supply Voltage Range.
  • Charge Pump for LED Driver.
  • Dual Mode 1x/1.5x.
  • Drives up to 4 LEDs with up to 31mA each.
  • Linear LED Output Control Options.
  • Maximum LED Current Set by AS2Cwire Interface, 32 Steps.
  • Fade In and Fade Out.
  • 0.9MHz Constant Frequency.
  • Automatic Soft-Start Limits Inrush Current.
  • Dual 150mA LDOs.
  • Five Voltages with 1.2V, 1.5V, 1.8V, 2.8V, and 3.0V, Sixteen Combinations Set by AS2Cwire.

📥 Download Datasheet

Datasheet Details

Part number AAT2869
Manufacturer Advanced Analogic Technologies
File Size 1.00 MB
Description constant-frequency charge pump DC/DC converter
Datasheet download datasheet AAT2869 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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PRODUCT DATASHEET AAT2869 SystemPowerTM General Description The AAT2869 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 AAT2869 is capable of driving 4 white LEDs at a total of 124mA 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 IN and OUTCP) makes the AAT2869 ideally suited for small battery-powered applications. The fade-in/fade-out feature makes backlight turn-on/turn-off more visual comfortable.