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Atmel LED Driver-MSL3082

General Description

MSL3082 compact, high-

power LED string driver uses

external MOSFETs to provide

up to at least 500mA per

string, with current accuracy

and matching better than

±1%. The MSL3082 drives

eight parallel strings of LEDs,

and offers fault detection and

management of open and

short circuit LEDs.

video frame-by-frame LED string intensity control for up to 16 interconnected

devices, allowing active area dimming when used for video displays. The

advanced PWM engine synchronizes with the video signal, and offers phase

shifted string drive, virtually eliminating waterfall noise and motion blur.

The MSL3082 adaptively controls the DC-DC converters that power the LED

strings, using patented Atmel's Adaptive SourcePower™ technology. These

efficiency optimizers minimize power use while maintaining LED current

accuracy, and allow up to eight interconnected devices to automatically

negotiate the optimum power supply voltage.

A unique combination of peak current control and pulse width dimming

management offers simple full-screen brightness control, versatile area

dimming, and a consistent white point. LED string current is set for each string

using a current sense (FET source) resistor. LED current is also digitally

controlled for all eight LED strings. Global string drive pulse width is adjusted

with a 6-bit global intensity register, and individual string pulse width is

modulated with 8-bit control. Additionally, the MSL3082 optionally throttles

back the PWM on time of all strings when the temperature of the LEDs

exceeds a programmable threshold.

The MSL3082 monitors for string open circuit, LED short circuit, loss-of-sync,

and over-temperature faults, and provides a hardware fault output to notify the

MCU. Detailed fault status and control are available through the serial interface.

Additionally, the MSL3082 includes an on-chip EEPROM that allows the

power-up default register settings to be customized via the serial interface.

The MSL3082 is offered in a 7 x 7 x 0.85mm, 44-pin QFN package, and

operates over a -40°C to +105°C temperature range.

Applications

Ordering Information

PART

INTERFACE

PACKAGE

MSL3082CS

8-channel LED driver

44-pin, 7x7x0.85mm QFN

Atmel LED Driver-MSL3082

8-string, High-power, White or RGB LED Driver for TV,

Blacklighting, or Intelligent Solid-state Lighting