The RT4822 integrates built-in power transistors, synchronous rectification, and low supply current to provide a compact solution for systems using advanced Li-Ion battery chemistries. The RT4822 is capable of supplying significant energy when the battery voltage is lower than the required voltage for system power ICs.

The RT4822 is a boost regulator designed to provide a minimum output voltage from a single-cell Li-Ion battery, even when the battery voltage is below system minimum. In boost mode, output voltage regulation is guaranteed to a maximum load current of 1500mA. Quiescent current in shutdown mode is less than 1μA, which maximizes the battery life. The regulator transitions smoothly between bypass and normal boost mode. The device can be forced into bypass mode to reduce quiescent current.

The RT4822 is available in the WL-CSP-9B 1.3x1.2 (BSC) package.


  • NFC Device Power Supply
  • USB Charging Ports
  • PC Accessory Application (Keyboard, Mouse...etc.)
  • TWS (True Wireless Stereo) Hall Sensor
  • Gaming Device Sensor
Key Spec.
Status Preview
Vin (min) (V) 1.8
Vin (max) (V) 5.5
Vout (min) (V) 3.15
Vout (max) (V) 5.5
Output Adj. Method Digital
Iq (typ) (mA) 0.006
SW Current Limit (typ) (A) 0.85;2.15;3.62
Freq (typ) (kHz) 3500
Freq (min) (kHz) 3000
Freq (max) (kHz) 4000
Ron (typ) (Ohm) 80
Interface I2C
Features ACOT Control;I2C;OCP;OVP;SCP;UVP
Package Type WL-CSP1.3x1.2-9(BSC)
  • Ultra-Low Operating Quiescent Current
  • Quickly Start-Up Time (< 400μsec)
  • 3 Few External Components: 1μH Inductor, 0402 Case Size Input and 0603 Case Size Output Case Size Capacitors
  • Input Voltage Range: 1.8V to 5.5V
  • Programmable Output Voltage from 3.15V to 5.5V with 25mV/Step
  • Support VIN > VOUT Operation
  • Default Boost Output Voltage Setting: VOUT = 5V
  • Maximum Continuous Load Current: 1.5A at VIN > 3.6V Boosting VOUT to 5V
  • Up to 93% Efficiency
  • Internal Synchronous Rectifier
  • Overcurrent Protection
  • Cycle by Cycle Current Limit
  • Undervoltage Protection
  • Overvoltage Protection
  • Short-Circuit Protection
  • Over-Temperature Protection
  • Small WL-CSP-9B 1.3x1.2 (BSC) Package
TitleLast UpdateDownload
Wide Input and Ultra-Low Quiescent Current Boost Converter with High Efficiency and I2C Flexible Control2022/12/05
Technical Documents
TitleLast UpdateDownload
Richtek Featured Product Tree [Aug., 2023]2023/08/07