The RT9490 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 AC Adapter;USB
Features ACOT Control;Adjustable Frequency;I2C;OCP;OVP;Power Good;SCP;UVP;Ultrasonic Mode Control
Package Type WL-CSP2.93x3.46-56(BSC)
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
    ► Supports 3.6V to 24V Input Voltage Range
    ► Average Input Current Regulation (AICR)
    ► Minimum Input Voltage Regulation (MIVR)
  • Supports USB On-The-Go (OTG)
    ► 93.8% 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)
  • Supports Dual Input Selection
  • Supports BC1.2, Host mode and FRS/Seamless
  • Supports 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 Charger2022/11/21
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9490WSCWL-CSP2.93x3.46-56(BSC)1500 Request Buy from Distributor