The RT9519B is an integrated single-cell Li-ion battery charger with auto power path management (APPM). No external MOSFETs are required. The RT9519B enters sleep mode when power is removed. Charging tasks are optimized by using a control algorithm to vary the charge rate, including pre-charge mode, fast charge mode and constant voltage mode. For the RT9519B, the charge current can also be programmed with an external resistor and modified with an external GPIO. The scope that the battery regulation voltage can be modified with an external GPIO depends on the battery temperature. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. The charging task will always be terminated in constant voltage mode when the charging current reduces to the termination current of 10% x ICHG_FAST. Other features include under voltage protection and over voltage protection for VIN supply.

The recommended junction temperature range spans from -40°C to 125°C, while the ambient temperature range extends from -40°C to 85°C.


  • Digital Cameras
  • PDAs and Smart Phones
  • Portable Instruments
Key Spec.
Status Active
Vin (min) (V) 4.4
Vin (max) (V) 6
Battery Charge Voltage (max) (V) 4.05;4.2
Battery Charge Current (max) (A) 1.2
Status Indicator Yes
Charger Type Linear
Input Source AC Adapter
Features Adjustable Current Limit;Enable Input;Internal Compensation;OVP;Power Good;UVP
Package Type WQFN3x3-20
Built-in Power MOSFETs Yes
  • 28V Maximum Rating for VIN Power
  • Selectable Power Current Limit (0.1A / 0.5A / 1.5A)
  • Integrated Power MOSFETs
  • Auto Power Path Management (APPM)
  • Battery Charging Current Control
  • Battery Regulation Voltage Control
  • Programmable Charging Current and Safe Charge Timer
  • Under Voltage Protection, Over Voltage Protection
  • Power Good and Charge Status Indicator
  • Optimized Charge Rate via Thermal Feedback
  • Thin 20-Lead WQFN Package
  • RoHS Compliant and Halogen Free
TitleLast UpdateDownload
Linear Single Cell Li-lon Battery Charger with Auto Power Path Management2011/11/08
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9519BGQWWQFN3x3-201500 Request Buy from Distributor