Single Cell Li-Ion Battery Charger with Adjustable Charging Current for Portable Applications


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The RT9527 is a low cost single-cell Li-ion charger for low current charge applications.The RT9527 can be powered up from an AC adapter or USB (Universal Serial Bus) port inputs. The RT9527 enters sleep mode when VIN power is removed. The RT9527 optimizes the charging task by using a control algorithm, which includes pre-charge mode, fast-charge mode and constant voltage mode. The charging task is kept in constant voltage mode to hold the battery in a full charge condition. The charge current is adjustable via an external resistor. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. The RT9527 features 28V maximum rating voltages for VIN. Other features include under voltage protection and over voltage protection for the AC adapter supply.The RT9527 is available in a WDFN-8L 2x2 package.


  • Cellular Phones
  • Digital Cameras
  • PDAs and Smart Phone
  • Portable Instruments
Key Spec.
Status Active
Vin (min) (V) 4.4
Vin (max) (V) 6
Battery Charge Voltage (max) (V) 4.2
Battery Charge Current (max) (A) 0.6
Status Indicator Yes
Charger Type Linear
Input Source AC Adapter;USB
Features Internal Compensation;OVP;Power Good;UVP
Package Type WDFN2x2-8
Built-in Power MOSFETs Yes
  • 28V Maximum Rating for AC Adapter
  • Internal Integrated Power FETs
  • Adjustable Charging Current
  • Programmable Safe Charge Timer
  • NTC Thermistor Input
  • Battery Reverse Protection
  • ISET Pin Short Protection
  • Charge Status Indicator
  • AC Adapter Power Good Status Indicator
  • End of Charge Current is 10% of Fast-Charge Current
  • Under Voltage Protection
  • Over Voltage Protection
  • Thermal Feedback Optimized Charge Rate
  • Small Thermally Enhanced 8-Lead WDFN Package
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
Single Cell Li-Ion Battery Charger with Adjustable Charging Current for Portable Applications2012/05/03
Technical Documents
TitleLast UpdateShareDownload
Power IC Solutions for IoT/Portable/Wearable/Battery-Powered Applications2020/12/30
Richtek Selection Guide [Oct., 2020]2020/12/30
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9527GQWWDFN2x2-82500 Request Buy from Distributor