LINEAR TECHNOLOGY - LT1942 Data Sheet
Summary
Linear Technology LT1942 quad DC/DC converter for TFT display supply and white LED backlight driver. Provides triple TFT outputs (two boost, one inverting) with power sequencing, plus LED driver with ballast circuitry. Features 1MHz operation, 2.6-16V input, soft-start, and open LED protection in 24-lead QFN. For display engineers.
Page 1 Text Content
LT1942
Quad DC/DC Converter for Triple Output TFT Supply
Plus LED Driver
FEATURES DESCRIPTIO Triple Output TFT Supply with Built-In The LT®1942 is a highly integrated quad switching regu- Power Sequencing lator designed to provide all necessary power supply Integrated White LED Backlight Driver functions for TFT displays, including the white LED Integrated Schottky Diodes backlight driver. The TFT supply incorporates two boost Active Ballast Circuitry Ensures Precise Current and one inverting DC/DC converters. The TFT supply Matching in White LEDs output voltages are independently set, unlike charge Low Noise 1MHz Fixed Frequency Operation pump solutions which have many limitations. Power 2.6V to 16V Input Voltage Range sequencing for the TFT supply is built into the part and is Soft-Start Limits Inrush Current user programmable. TFT Supply Output Voltages Independently Set
The LED driver is a boost DC/DC converter that can be
(Not Charge Pump Derived)
independently controlled. The LED driver has built-in
Power Good and Output Disconnect for TFT Supply
dimming control for precise control of LED current. An 8:1
Built-In LED Dimming Capability
dimming range is achieved by adjusting the CTRL4
Open LED Protection for LED Driver
voltage.The user can elect to drive a single string or two
24-Lead QFN Package (4mm × 4mm)
strings of LEDs. An LED ballast circuit is included to precisely match the LED currents if two strings of LEDs are
APPLICATIO S
used. Soft-start is built into the LED driver as well as the Poly-Silicon TFT Displays primary TFT supply.
Amorphous Silicon TFT Displays
The LT1942 is available in a low profile (0.75mm) 24-lead QFN (4mm × 4mm) package. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TFT Bias and White LED Backlight Power Supply
CMDSH-3 22µH Si2301BDS AVDD
3V TO 4.2V
D3 SW3 VCC SW1
VON 0.22µF FB3 FB1 100k 4.7µF
100k PGND14
PGND23 PGOOD
10k VOUT3 SW4 VIN
LT1942 33µH
0.22µF NFB2 D4 665k D2 LED1
VOFF 47µH
–10V SW2 LED2
SHDN SGND/ FB4
CTRL4 AGND SS1 SS4 CT
SHUTDOWN
4.99Ω 1942 TA01
LED CONTROL
1942fa
Page Summary Contents For LINEAR TECHNOLOGY - LT1942 Data Sheet
Manual Details
| Brand | Linear |
|---|---|
| Pages | 16 |
| File Size | 248.23 KB |
| Published | June 15, 2026 |
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Frequently Asked Questions
What is the input voltage range of the LT1942?
The LT1942 operates with an input voltage range of 2.6V to 16V.
What package does the LT1942 come in?
It is available in a 24-lead 4mm × 4mm QFN package with 0.75mm profile.
How is LED dimming controlled on the LT1942?
Dimming is controlled by adjusting the CTRL4 voltage, achieving an 8:1 dimming range.
What is the maximum operating temperature of the LT1942?
The maximum operating temperature range is –40°C to 85°C, with max junction temperature 125°C.