The RT9527J/JH/JA is a low-cost single-cell Li-ion battery charger for low charge current applications.
The RT9527J/JH/JA can be powered via an AC adapter or USB port and enters sleep mode when power is removed. It uses a control algorithm to optimize charging, featuring pre-charge, fast-charge, and constant voltage modes. The device maintains the battery in a fully charged condition by consistently operating in constant voltage mode. Charge current can be adjusted with an external resistor. Internal thermal feedback regulates the die temperature to optimize charge rates under varying ambient conditions. The device supports a maximum VIN of 28V and features both undervoltage and overvoltage protection for the AC adapter input.
The RT9527J/JH/JA is available in the WDFN-8L 2x2 package. The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.


  • Cellular Phones
  • Digital Cameras
  • Smart Phones
  • Portable Instruments
Key Spec.
RT9527J RT9527JA RT9527JH
Status Active Active Active
Vin (min) (V) 4.4 4.4 4.4
Vin (max) (V) 6 6 6
Battery Charge Voltage (max) (V) 4.2 4.4 4.35
Battery Charge Current (max) (A) 0.6 0.6 0.6
Status Indicator Yes Yes Yes
Charger Type Linear Linear Linear
Input Source AC Adapter;USB AC Adapter;USB AC Adapter;USB
Features OVP;Power Good;UVP OVP;Power Good;UVP OVP;Power Good;UVP
Package Type WDFN2x2-8 WDFN2x2-8 WDFN2x2-8
Built-in Power MOSFETs Yes Yes Yes
  • 28V Maximum Rating for AC Adapter
  • Internal Integrated Power FETs
  • Adjustable Charging Current
  • Programmable Safe Charge Timer
  • NTC Thermistor Input
  • Reverse Battery Protection
  • The ISET Pin Short Protection
  • Charge Status Indicator
  • AC Adapter Power-Good Indicator
  • End of Charge Current is set at 10% of the Fast-Charge Current
  • Undervoltage Protection
  • Overvoltage Protection
  • Battery Pack Temperature Monitoring (Hot, Warm, Cool, and Cold 4 Thresholds)
  • Thermal Feedback Optimized Charge Rate
  • Small Thermally Enhanced 8-Lead WDFN Package
TitleLast UpdateDownload
Single-Cell Li-Ion Battery Charger with Adjustable Charging Current for Portable Applications2022/12/30