The RT4823 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 RT4823 is capable of supplying significant energy when the battery voltage is lower than the required voltage for system power ICs.

The RT4823 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 RT4823 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 Active
Vin (min) (V) 1.8
Vin (max) (V) 5.5
Vout (min) (V) 5
Vout (max) (V) 5
Output Adj. Method Fixed
Iq (typ) (mA) 0.004
SW Current Limit (typ) (A) 2.15
Freq (typ) (kHz) 3.5
Freq (min) (kHz) 3
Freq (max) (kHz) 4
Ron (typ) (Ohm) 0.08
Features OCP;OVP;SCP
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
  • Support VIN > VOUT Operation
  • Default Boost Output Voltage Setting : VOUT = 5V
  • Maximum Continuous Load Current : 1.3A at VIN > 3.6V Boosting VOUT to 5V
  • Up to 93% Efficiency
  • EN(H) : Boost Mode
  • EN(L), BP(H) : Bypass Mode
  • EN(L), BP(L) : Shutdown Mode
  • Internal Synchronous Rectifier
  • Over-Current Protection
  • Cycle-by-Cycle Current Limit
  • Over-Voltage 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 Efficiency2022/08/31
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Featured Product Tree [Aug., 2023] Selection Guide2023/08/07
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT4823WSCWL-CSP1.3x1.2-9(BSC)3000 Request Buy from Distributor