GENERAL DESCRIPTION

The ADD5211 is a 4 channel, white LED driver for backlight applications based on high efficiency, current mode, step-up converter technology. The boost controller drives an external MOSFET switch for step-up regulation from an input voltage of 4.5 V to 40 V and a pin adjustable operating frequency between 200 kHz and 1.2 MHz. An adjustable UVLO function is implemented to reduce input current during power-off.

FEATURES

White LED driver based on an inductive boost controller

  Wide input voltage range: 4.5 V to 40 V

  Adaptive output voltage to minimize power dissipation

  Adjustable operating frequency: 200 kHz to 1.2 MHz

  Programmable UVLO

  Programmable soft start time for boost converter

  Programmable external MOSFET switching rising/falling time

Drives up to 4 LED current sinks with internal MOSFETs

  Brightness control with PWM input

  Adjustable LED current: 40 mA up to 200 mA

  Headroom control to maximize efficiency

  LED dimming frequency: up to 25 kHz

  1000:1 PWM dimming at 300 Hz

  Open drain fault indicator

  LED open and LED short fault protection

  Thermal shutdown

  Undervoltage lockout

  24-lead, 4 mm × 4 mm LFCSP