LCD Bias Power Reference Design


Design files


This reference design delivers a low cost LCD bias power circuit using the boost converter IC TPS61085. The solution provides all four voltages required by the thin film transistor (TFT) LCD display. The TPS61085 boost converter generates the AVDD voltage. Two external charge pump circuits provide the positive VGH and negative VGL bias voltage for the TFT. One external op-amp LM7321MF acts as a high current buffer; it provides the VCOM voltage for the TFT backplane.

  • Discrete solution for LCD bias power
  • Low cost and small size
  • A high current buffer is also provided
  • This circuit has been tested on a reference design board
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU683.PDF (822 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement

TIDRCJ4.ZIP (94140 K)

Files used for 3D models or 2D drawings of IC components

TIDC868.ZIP (624 K)

Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Boost converters (integrated switch)

TPS6108518.5-V, 2-A, 650-kHz / 1.2-MHz step-up DC/DC converter

Data sheet: PDF | HTML
General-purpose op amps

LM7321Single, 32-V, 20-MHz operational amplifier

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report LCD Bias Power Reference Design With TPS61085 Dec. 10, 2014

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