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LT1942

Linear
Part Number LT1942
Manufacturer Linear
Description Quad DC/DC Converter
Published Apr 18, 2016
Detailed Description U U FEATURES ■ Triple Output TFT Supply with Built-In Power Sequencing ■ Integrated White LED Backlight Driver ■ Integr...
Datasheet PDF File LT1942 PDF File

LT1942
LT1942

Overview
U U FEATURES ■ Triple Output TFT Supply with Built-In Power Sequencing ■ Integrated White LED Backlight Driver ■ Integrated Schottky Diodes ■ Active Ballast Circuitry Ensures Precise Current Matching in White LEDs ■ Low Noise 1MHz Fixed Frequency Operation ■ 2.
6V to 16V Input Voltage Range ■ Soft-Start Limits Inrush Current ■ TFT Supply Output Voltages Independently Set (Not Charge Pump Derived) ■ Power Good and Output Disconnect for TFT Supply ■ Built-In LED Dimming Capability ■ Open LED Protection for LED Driver ■ 24-Lead QFN Package (4mm × 4mm) U APPLICATIO S ■ Poly-Silicon TFT Displays ■ Amorphous Silicon TFT Displays , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LT1942 Quad DC/DC Converter for Triple Output TFT Supply Plus LED Driver DESCRIPTIO The LT®1942 is a highly integrated quad switching regulator designed to provide all necessary power supply functions for TFT displays, including the white LED backlight driver.
The TFT supply incorporates two boost and one inverting DC/DC converters.
The TFT supply output voltages are independently set, unlike charge pump solutions which have many limitations.
Power sequencing for the TFT supply is built into the part and is user programmable.
The LED driver is a boost DC/DC converter that can be independently controlled.
The LED driver has built-in dimming control for precise control of LED current.
An 8:1 dimming range is achieved by adjusting the CTRL4 voltage.
The user can elect to drive a single string or two strings of LEDs.
An LED ballast circuit is included to precisely match the LED currents if two strings of LEDs are used.
Soft-start is built into the LED driver as well as the primary TFT supply.
The LT1942 is available in a low profile (0.
75mm) 24-lead QFN (4mm × 4mm) package.
TYPICAL APPLICATIO TFT Bias and White LED Backlight Power Supply VIN 3V TO 4.
2V 2.
2µF VON 0.
22µF 10V 2mA 10k 0.
22µF VOFF –10V 2mA ...


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