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28-HTSSOP
Integrated Circuits (ICs)

LM3431QMH/NOPB

Active
Texas Instruments

3-CHANNEL AUTOMOTIVE CONSTANT CURRENT LED DRIVER WITH INTEGRATED BOOST CONTROLLER

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Search across all available documentation for this part.

DocumentsAN-1764 LM3431 Evaluation Board (Rev. A)CCFL to LED Conversion Power Supply User Guide+3
28-HTSSOP
Integrated Circuits (ICs)

LM3431QMH/NOPB

Active
Texas Instruments

3-CHANNEL AUTOMOTIVE CONSTANT CURRENT LED DRIVER WITH INTEGRATED BOOST CONTROLLER

Deep-Dive with AI

DocumentsAN-1764 LM3431 Evaluation Board (Rev. A)CCFL to LED Conversion Power Supply User Guide+3

Technical Specifications

Parameters and characteristics for this part

SpecificationLM3431QMH/NOPB
ApplicationsBacklight
DimmingAnalog, PWM
Frequency1 MHz
GradeAutomotive
Internal Switch(s)False
Mounting TypeSurface Mount
Number of Outputs3
Operating Temperature [Max]125 ¯C
Operating Temperature [Min]-40 °C
Package / Case28-PowerTSSOP
Package / Case [custom]4.4 mm
Package / Case [custom]0.173 "
QualificationAEC-Q100
Supplier Device Package28-HTSSOP
TopologyStep-Up (Boost)
TypeDC DC Controller
Voltage - Supply (Max) [Max]36 V
Voltage - Supply (Min) [Min]4.5 V

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

DistributorPackageQuantity$
DigikeyTube 288$ 3.82
Texas InstrumentsTUBE 1$ 4.13
100$ 3.61
250$ 2.53
1000$ 2.04

Description

General part information

LM3431-Q1 Series

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.