RT9921 Overview
The RT9921 includes a high-performance boost regulator, a low dropout linear regulator (LDO), a gate pulse modulator (GPM), a voltage detector, a V 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...
RT9921 Key Features
- 2.5V to 5.5V Input Supply Voltage
- 640kHz/1.2MHz Current-Mode Boost Regulator
- Low Dropout Voltage Linear Regulator Adjustable Output Voltage : 1.5V to VIN
- 0.5V ( ±1.5%) Maximum Output Current : 350mA
- On-Chip GPM Controller with Adjustable Falling Time and Power-On Delay Flicker pensator Power-On Sequence Control
- Low Voltage Detector Programmable Detecting Voltage (±2%) and Delay Time
- Unity-Gain Operation Amplifier for V Buffer
- Charge Pump for VGH regulation
- Over-Temperature Protection
- Thin 2