LT1942

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Quad DC/DC Converter for Triple Output TFT Supply Plus LED Driver

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Part Models
2
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Part Details

  • 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)
LT1942
Quad DC/DC Converter for Triple Output TFT Supply Plus LED Driver
TFT Bias and White LED Backlight Power Supply Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Data Sheet

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Evaluation Kits

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schematic 1
DC688A

LT1942EUF | Quad Converter For TFT Supply and LED Driver, VIN=3V-4.5V, VON=10V/2mA, VOFF=-10V/2mA, AVDD=5V/40mA

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Product Details

Demonstration Circuit DC688 is a quad output power supply intended for use in small to medium size TFT panels. The circuit features the LT1942 quad output switching regulator and generates an LED driver along with the triple output supply required for the TFT panels. With an input voltage range of 3V to 4.2V, two step-up regulators and one inverting regulator provide AVDD , VON and VOFF bias voltages for the LCD panels. Another high power boost is used to drive 12 LEDs (2 strings of 6 LEDs each). For 3V minimum input voltage, up to 20mA current is available for each LED string. A built-in LED ballast circuit is included to precisely match the LED currents in the two strings.


 
DC688A
LT1942EUF | Quad Converter For TFT Supply and LED Driver, VIN=3V-4.5V, VON=10V/2mA, VOFF=-10V/2mA, AVDD=5V/40mA
DC688A - Schematic

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