Atmel LED Driver-MSL3085
8-string White and RGB LED Driver with Adaptive Power Control,
2
EEPROM, and I C/SMBus Serial Interface
Datasheet BriefAtmel LED Driver-MSL3085
8-string White and RGB LED Driver with Adaptive Power
2
Control, EEPROM, and I C/SMBus Serial Interface
2
The MSL3085 features a 1MHz I C serial interface. The interface supports
video frame-by-frame LED string intensity control for up to eight
interconnected devices, allowing active area dimming and phase shifted
General Description
PWM timing for video displays. It includes an advanced PWM engine that
synchronizes LED timing with the video signal for reduced motion blur and
waterfall noise.
The Atmel LED Driver-
The MSL3085 adaptively controls the DC-DC converters that power the LED
MSL3085 compact, high-
strings using patented Atmel Adaptive SourcePower technology. These
fault monitored efficiency optimizers minimize power use while maintaining
power 8 LED strings controller
LED current accuracy, and allow up to eight interconnected devices to
uses external MOSFETs to sink
automatically negotiate the optimum power supply voltage.
up to 350mA per string, with
A unique combination of peak current control and pulse width dimming
current accuracy and matching
management offers simple full-screen brightness control, versatile area
better than 1.5%. The
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
MSL3085 drives eight parallel
controlled for all eight LED strings. Global string drive pulse width is adjusted
strings of LEDs, and offers fault
with an 8-bit global intensity register, and individual string pulse width is
detection and management of
modulated with 12-bit control.
open and short circuit LEDs.
The MSL3085 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 MSL3085 includes an on-chip EEPROM that allows the
power-up default register settings to be customized via the serial interface.
The MSL3085 is offered in a 6 x 6 x 0.75mm, 40-pin TQFN package, and
operates over a -40C to +105C temperature range.
Applications
Long Life, Efficient LED Backlighting for:
Televisions and Desktop Monitors
Medical and Industrial Instrumentation
Automotive Audio-visual Displays
Channel Signs
Architectural Lighting
Ordering Information
EIGHT-CHANNEL LED STRING DRIVER
PART INTERFACE PACKAGE
2
MSL3085BT I C 40-pin, 6 x 6 x 0.75mm TQFN
2 Atmel LED Driver-MSL3085