The RT9505 is a fully integrated low cost single-cell Li-Ion battery charger IC ideal for portable applications. The RT9505 is capable of being powered up from AC adapter. The RT9505 enters sleep mode when AC adapter is removed.
The RT9505 optimizes the charging task by using a control algorithm including preconditioning mode, fast charge mode and constant voltage mode. The charging task is terminated as the charge current drops below the preset threshold. The AC adapter charge current can be programmed up to 1A with an external resister. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures.
The RT9505 features 18V maximum rating voltages for AC adapter. The other features are under voltage protection, over voltage protection for AC adapter supply and battery temperature monitoring.


  • Digital Cameras
  • Cellular Phones
  • Personal Data Assistants (PDAs)
  • MP3 Players
  • Hand Held PCs
Key Spec.
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 6
Battery Charge Voltage (max) (V) 4.2
Battery Charge Current (max) (A) 1.2
Status Indicator Yes
Charger Type Linear
Input Source AC Adapter
Features Enable Input;Internal Compensation;OVP;Power Good;UVP
Package Type WDFN3x3-10
Built-in Power MOSFETs Yes
  • 18V Maximum Rating for AC Adapter
  • Internal Integrate P-MOSFETs
  • AC Adapter Power Good Status Indicator
  • Charge Status Indicator
  • Under Voltage Protection
  • Over Voltage Protection
  • Automatic Recharge Feature
  • Battery Temperature Monitoring
  • Small 10-Lead WDFN Package
  • Thermal Feedback Optimizing Charge Rate
  • RoHS Compliant and 100% Lead (Pb)-Free
TitleLast UpdateDownload
Linear Single Cell Li-Ion Battery Charger IC2011/10/05
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9505GQWWDFN3x3-101500 Request Buy from Distributor