Datasheet

2 Atmel LED Driver-MSL3082
General Description
The Atmel
®
LED Driver-
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.
The MSL3082 features a 1MHz I
2
C serial interface. The interface supports
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
• Edge-lit LED Backlit TVs
• High-contrast Monitors
• Medical and Industrial Displays
• High-power LED Arrays
• Multi-string LED Lighting
• Intelligent Solid-state Lighting (SSL)
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