RT9913B

Preliminary RT9913A/B Integrated Multi-Channel DC-DC Converter for TFT LCD Panels General Description Features The RT9913A/B includes a high-performance boost regulator, one linear-regulator controller for VGL, one low dropout linear regulator, a gate pulse modulator (GPM), a voltage detector and a VCOM Buffer (Unity- gain OPA) for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs). The boost converter provides the regulated supply voltage for the panel source driver ICs. With integrated 16V N-Channel 0.2Ω MOSFET it allows the use of ultra-small inductors and ceramic capacitors and provides fast transient response to pulsed loads. The VGL linear-regulator controller provides regulated TFTGate-Off . The low-dropout linear regulator (LDO) using an internal PMOS as the pass device can supply up to 350mA current is suitable for the supply voltage to the T-CON ASIC. And the GPM is controlled by frame signals from timing controller to modulate the Gate-On voltage. Voltage detector monitors the supply voltage to issue a reset signal while the detected voltage is too low. The VCOM Buffer (Unity-gain) high-performance operation amplifier) can drive the LCD backplane (VCOM) and features high short-circuit current (140mA), fast slew rate (12V/μs), wide bandwidth (12MHz) and rail-to-rail input and output. z 2.5V to 5.5V Input Supply Voltage z 640kHz/1.2MHz (A/B version) Current-Mode Step-Up Boost Regulator Fast Transient Response to Pulsed Load High Accuracy O...