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Atmel LED Drivers-MSL2041/2042

General Description

MSL2041 and MSL2042

compact, high-power LED

string controllers use external

current control MOSFETs to

sink up to 1A per string, with

string current matching of

±0.5%. The MSL2041/2 drive

four parallel strings of LEDs

and offer fault detection and

management of open circuit

and short circuit LEDs. The

MSL2041 features four PWM

inputs that allow independent

frequency, dimming and

phasing of each string, while

the MSL2042 offers one

PWM input for frequency and

dimming control of all four

strings, and automatically

phase shifts the string drive

signals. Peak string currents

are set using current sense

(FET source) resistors and

adjustable with an internal

8-bit DAC.

Atmel LED Drivers-MSL2041/MSL2042

Low-cost, Simple 4-string LED Drivers with External Current Sink

MOSFETs, 5000:1 Dimming Range and Per String PWM Input

The MSL2041/2 adaptively control up to two DC-DC converters that power

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

Efficiency Optimizers minimize power use while maintaining LED current

accuracy. Multiple MSL2041/2s cascade to automatically negotiate the

optimum power supply voltage when driving more than four strings from a

single power supply.

The MSL2041/2 features fault control for open-circuit strings, LED short-

circuits and device over-temperature conditions. When a string open-circuit or

LED short-circuit condition is detected, the MSL2041/2 turn off the faulty string

and pull the open-drain fault output low.

The MSL2041/2 feature stand-alone operation, and the basic circuit requires

provided to allow optional control and monitoring of the various fault detection

and Adaptive SourcePower parameters, but is not required for operation.

The MSL2041/2 are offered in the 32-pin, 300mil SOP package, and operate

over the -40°C to +85°C temperature range.

Applications

Ordering Information

PART NO.

PWM INPUTS

AUTO-PHASE

DELAY

PACKAGE

MSL2041GU

4

NO

32 pin, 300mil SOP

MSL2042GU

1

YES

32 pin, 300mil SOP