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
