TPS65146,pdf(Compact LCD Bias

The TPS65146 offers a very compact power supply solution designed to supply the LCD bias voltages required by TFT (Thin Film Transistor) LCD panels running from a typical 3.3 V or 5 V supply rail. The device integrates a step-up converter for V_S (Source Driver voltage), a positive charge pump regulator for V_GH (Gate Driver High voltage), a logic voltage rail using an integrated LDO and a Vcom buffer driving the LCD backplane. In addition to that, a gate voltage shaping block is integrated for V_GH, modulating the signal (into V_GHM) with high flexibility by using a logic input VFLK and an external discharge resistor connected to RE pin. Also, an external discrete negative charge pump can be set using the boost converter of the TPS65146 to generate V_GL (Gate Driver Low voltage).