PMP9770, LCD Bias Power Reference Design with TPS61085 DC to DC Converter

PMP9770, LCD Bias Power Reference Design with TPS61085 DC to DC Converter. 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