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RT9921 - Integrated Multi-Channel DC-DC Converter

General Description

The RT9921 includes a high-performance boost regulator, a low dropout linear regulator (LDO), a gate pulse modulator (GPM), a voltage detector, a VCOM buffer (unitygain OPA), and a VGH charge pump controller for activematrix thin-film transistor (TFT) liquid-crystal displays (LCDs).

Key Features

  • high short-circuit current (140mA), fast slew rate (12V/μs), wide bandwidth (12MHz) and rail-to-rail inputs and outputs. The VGH charge pump controller provides regulated TFT Gate-On voltage. The regulation of the positive charge pump is generated by the internal comparator that senses the output voltage and compares it with an internal reference. Features.
  • 2.5V to 5.5V Input Supply Voltage.
  • 640kHz/1.2MHz Current-Mode Boost Regulator  Fast Transient Response to Pulsed Load  Adjustab.

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Datasheet Details

Part number RT9921
Manufacturer Richtek Technology Corporation
File Size 241.71 KB
Description Integrated Multi-Channel DC-DC Converter
Datasheet download datasheet RT9921 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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® RT9921 Integrated Multi-Channel DC/DC Converter for TFT LCD Panels General Description The RT9921 includes a high-performance boost regulator, a low dropout linear regulator (LDO), a gate pulse modulator (GPM), a voltage detector, a VCOM buffer (unitygain OPA), and a VGH charge pump controller for activematrix thin-film transistor (TFT) liquid-crystal displays (LCDs). The boost converter provides the regulated supply voltage for the panel source driver ICs. The converter is a high switching frequency (640kHz or 1.2MHz) current-mode regulator with an integrated 16V N-Channel 0.2Ω MOSFET that allows the use of ultra-small inductors and ceramic capacitors. It provides fast transient response to pulsed loading while achieving efficiency over 90%.