RT9921 Datasheet – Multi-Channel DC-DC Converter – Richtek

Part Number: RT9921

Function: Integrated Multi-Channel DC-DC Converter

Package: VQFN-24L 4×4 Type

Manufacturer: Richtek Technology


RT9921 pinout datasheet


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 (unity gain OPA), and a VGH charge pump controller 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. 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%. The device can produce output voltage as high as 15V from an input as low as 2.5V. Soft-Start is programmed by external capacitor, which sets the input-current ramp-rate.

RT9921 Datasheet


1. 2.5V to 5.5V Input Supply Voltage
2. 640kHz/1.2MHz Current-Mode Boost Regulator
3. Low Dropout Voltage Linear Regulator
4. On-Chip GPM Controller with Adjustable
5. Low Voltage Detector
6. Unity-Gain Operation Amplifier for VCOM Buffer
7. Charge Pump for VGH regulation
8. Over-Temperature Protection

Other data sheets are available within the file: RT9921PQV, RT9921GQV, RT9921P, RT9921G

RT9921 Datasheet PDF Download

RT9921 pdf

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