LCD Bias Power Reference Design
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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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Schematic/Block Diagram

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Test Data

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Design Files

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM7321  Single ch, RRIO, high output current & unlimited cap load +/-15V op amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS61085  18.5V, 2A, 650kHz / 1.2MHz Step-Up DC-DC Converter w/ Forced PWM Mode  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM7321 Download Download
Download Download
TPS61085 Download Download
Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 751 10 Dec 2014
Design files (6)
Title Type Size (KB) Date
ZIP 624 13 Jan 2015
ZIP 94140 13 Jan 2015
PDF 521 13 Jan 2015
PDF 92 13 Jan 2015
PDF 120 13 Jan 2015
PDF 27 13 Jan 2015

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