The ADD5211ACPZ-R7 is a 4-string white LED Driver for backlight applications based on high efficiency, current mode and step-up converter technology. The boost controller drives an external MOSFET switch for step-up regulation from an input voltage of 4.5 to 40V and a pin adjustable operating frequency from 200kHz to 1.2MHz. An adjustable UVLO function is implemented to reduce input current during power-OFF. The ADD5211 provides four regulated current sinks for uniform brightness intensity. Each current sink can be driven from 40 to 200mA, the LED driving current is pin adjustable using an external resistor. With an input PWM interface, the ADD5211 drives up to four parallel strings of multiple series connected LEDs. Additional features include LED short protection, LED open protection, boost output short protection, over-voltage protection, cycle-by-cycle current limit and thermal shutdown for both the IC and the LED array.
- White LED driver based on an inductive boost controller
- Adaptive output voltage to minimize power dissipation
- 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
- Headroom control to maximize efficiency
- LED dimming frequency - up to 25kHz
- Open-drain fault indicator
- LED open and LED short fault protection
- Thermal shutdown
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