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


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The RT9527A is a low cost single-cell Li-ion charger for low current charge applications.

The RT9527A can be powered up from an AC adapter or USB (Universal Serial Bus) port inputs. The RT9527A enters sleep mode when VIN power is removed. The RT9527A 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 RT9527A features 28V maximum rating voltage for VIN. Other features include under-voltage protection and over-voltage protection for the AC adapter supply.

The RT9527A is available in the 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) 4.444
Battery Charge Current (max) (A) 0.6
Status Indicator Yes
Charger Type Switching
Input Source USB
Features OCP;OVP;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 Applications2017/08/09
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