The RT9492 is a highly-integrated 5A Buck-Boost switch mode battery charge management and system power path management device for 2-4 cell Li-Ion and Li-polymer battery. The low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I2C serial interface with charging and system settings makes the device a truly flexible solution.
The recommended junction temperature range is -40°C to 130°C, and the ambient temperature range is -40°C to 85°C.


  • Smart Phone/Tablet/Chrome Book
  • Drone
  • Portable Device and Accessory
Key Spec.
Status Active
Vin (min) (V) 3.6
Vin (max) (V) 24
Battery Charge Voltage (max) (V) 18.8
Battery Charge Current (max) (A) 5
Status Indicator Yes
Charger Type Switching
Input Source USB
Features ACOT Control;Adjustable Current Limit;Adjustable Frequency;Built-in Bootstrap Switch;Cycle-by-Cycle Current Limit;Enable Input;I2C;OCP;OVP;SCP;Stable with Ceramic Capacitor;UVP
Package Type VQFN4x4-29T(FC)
Built-in Power MOSFETs Yes
  • High Efficiency, 750kHz/1MHz/1.5MHz Programmable Frequencies, Synchronous Switch-Mode Buck-Boost Charger
    - 96.7% Charge Efficiency at 2A with 9V Input and 8V Battery
    - Support 3.6V to 24V Input Voltage Range
    - Average Input Current Regulation (AICR)
    - Minimum Input Voltage Regulation (MIVR)
  • Support USB On-The-Go (OTG)
    - 93.4% OTG Efficiency at 2A with 8.4V Battery and 5V Output
    - Output Voltage with 10mV Resolution to Support USB-PD
    - BAT Current Limit Regulation (BCLR)
  • Support Dual Input Selection
  • Support BC1.2, Host Mode and FRS/Seamless
  • Support 11-Channel, 16-bit ADC
  • Low Battery Quiescent Current
  • High Accuracy for Charger CV and ICHG
  • Protection
    - Over-Temperature Protection (OTP)
    - Junction Thermal Regulation (JTR)
    - Input Protection (VAC OVP/VBUS OVP/OCP)
    - Battery Overvoltage Protection (VBAT OVP)
    - System Voltage Protection (VSYS OVP/UVP)
    - System Over-Load Protection (VSYS OLP)
    - Cycle-by-Cycle Overcurrent Protection (OCP)
    - OTG Low Battery Protection (OTG LBP)
    - OTG Voltage Protection (OTG OVP/UVP)
TitleLast UpdateDownload
5A 2-4 Cell Buck-Boost Switching Battery Charger2023/07/11