3-Channel Constant Current LED Driver With Integrated Boost Controller

The LM3431 is a 3-channel linear current controller combined with a boost switching controller ideal for driving LED backlight panels in space critical applications. The LM3431 drives 3 external NPN Transistors or MOSFETs to deliver high accuracy constant current to 3 LED strings. Output current is adjustable to drive strings in excess of 200 mA. The LM3431 CAN be expanded to drive as many as 6 LED strings.
The boost controller drives an external NFET Switch for Step-up regulation from input voltages between 5V and 36V. The LM3431 features LED cathode feedback to minimize Regulator headroom and optimize efficiency.
A DIM input pin controls LED brightness from Analog or digital control signals. Dimming frequencies up to 25 kHz are possible with a contrast ratio of 100:1. Contrast ratios greater than 1000:1 are possible at lower dimming frequencies.
The LM3431 eliminates audible noise problems by maintaining constant output voltage regulation during LED dimming. Additional features include LED short and open protection, fault delay/error flag, cycle by cycle current limit, and thermal shutdown for both the IC and LED array.
By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM3431-REF Texas Instruments CCFL to LED Conversion Power Supply
LM3431MHX/NOPB Texas Instruments 3-Channel Constant Current LED Driver with Integrated Boost Controller 28-HTSSOP -40 to 125
LM3431AMHX/NOPB Texas Instruments 3-Channel Constant Current LED Driver with Integrated Boost Controller 28-HTSSOP -40 to 125
LM3431QMH/NOPB Texas Instruments 3-Channel Constant Current LED Driver with Integrated Boost Controller 28-HTSSOP -40 to 125
LM3431MH/NOPB Texas Instruments 3-Channel Constant Current LED Driver with Integrated Boost Controller 28-HTSSOP -40 to 125
LM3431QMHX/NOPB Texas Instruments 3-Channel Constant Current LED Driver with Integrated Boost Controller 28-HTSSOP -40 to 125
LM3431AQMHX/NOPB Texas Instruments 3-Channel Constant Current LED Driver with Integrated Boost Controller 28-HTSSOP -40 to 125
LM3431AQMH/NOPB Texas Instruments 3-Channel Constant Current LED Driver with Integrated Boost Controller 28-HTSSOP -40 to 125
LM3431AMH/NOPB Texas Instruments 3-Channel Constant Current LED Driver with Integrated Boost Controller 28-HTSSOP -40 to 125
LM3431 's PackagesLM3431 's pdf datasheet
LM3431MH TSSOP
LM3431MHX TSSOP




LM3431 Pinout, Pinouts
LM3431 pinout,Pin out
This is one package pinout of LM3431,If you need more pinouts please download LM3431's pdf datasheet.

LM3431 Application circuits
LM3431 circuits
This is one application circuit of LM3431,If you need more circuits,please download LM3431's pdf datasheet.


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