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A8435 Datasheet High Efficiency Charge Pump White LED Driver

Manufacturer: Allegro MicroSystems

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General Description

The A8435 high efficiency charge pump IC offers a simple, low-cost white LED driver solution for portable electronics display applications.

Using a proprietary control scheme (1×, 1.5×), the A8435 can output well-matched currents for up to 4 LEDs, while maintaining the highest efficiency over most of the Li-ion battery lifetime.

The A8435 accepts an input range of 2.7 to 5.5 V and delivers up to 30 mA for each of the four regulated current sources.

Overview

A8435 High Efficiency Charge Pump White LED Driver.

Key Features

  • Proprietary adaptive control scheme (1×, 1.5×).
  • Maximum efficiency, over 92%.
  • 0.5% LED current matching.
  • 1 MHz operating frequency.
  • Flexible dimming control: ▫ Serial 11-level dimming, down to 5% ▫ PWM ▫ 2-bit parallel.
  • Drives up to 4 white LEDs.
  • 30 mA per LED.
  • 120 mA total continuous output.
  • Low input ripple and EMI.
  • Soft-start limits inrush current.
  • Short circuit protection.
  • Overvoltage protection.
  • Thermal shutdown protection.

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