The RT9528 is a programmable single-cell Li-ion battery charger with I2C programmable control I/F, Auto Power-Path Management IC and USB/AV Switch. For the RT9528, there is no need to use external MOSFET. The RT9528 enters sleep mode when supplies are removed. The RT9528 optimizes the charging task by using a control algorithm including pre-charge mode, fast charge mode and constant voltage mode. The RT9528 includes termination, timer, charge current and VSYS settings via a serial I2C control I/F.

The RT9528 provides protections for the battery pack, charger and input circuitry such as over current, under voltage, over voltage, thermal regulation and thermal protection. Status can be monitored via the serial port for charge state and fault conditions.

The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures.

The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.


  • Digital Cameras
  • PDAs and Smart Phones
  • Portable Instruments
Key Spec.
Status Active
Vin (min) (V) 4.35
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;USB
Features Adjustable Current Limit;I2C;Internal Compensation;Low Dropout;OVP;Power Good;UVP
Package Type WQFN4x4-28
Built-in Power MOSFETs Yes
  • 28V Maximum Rating for AC Adapter
  • Auto Power Path Management (APPM)
  • High-Speed USB Operation
  • USB/Audio/Video Switches
  • Negative Rail Audio Signal Path
  • I2C controlled Interface
  • Integrated 3.3V LDO for TS Circuitry
  • Integrated Power MOSFETs
  • Interrupt Status Indicator
  • Power Good and Charge Status Indicators
  • Under/Over Voltage Protection
  • Thermal Feedback Optimizing Charge Rate
  • 28-Lead WQFN Package
  • RoHS Compliant and Halogen Free
TitleLast UpdateDownload
I2C Programmable Linear Single Cell Li-Ion Battery Charger with Auto Power-Path Management and USB/AV Switch2012/03/30
Additional Documents
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Power Management Components for Lithium-Ion Battery Powered Applications