The RT9526 is a fully integrated low cost single cell Li-ion battery charger ideal for portable applications. The RT9526 is capable of being powered up from AC adapter and USB (Universal Serial Bus) port inputs. The RT9526 enters sleep mode when supplies are removed. The RT9526 optimizes the charging task by using a control algorithm including preconditioning mode, fast charge mode, and constant voltage mode. The charging task will remain in constant voltage mode to hold the battery in a full charge condition. The charge current can be programmed with an external resistor. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate under all ambient temperatures. The RT9526 features 28V maximum rating voltage for VIN. The other features are under voltage protection and over voltage protection for the AC adapter supply.
The RT9526 is available in WDFN-8L 2x2, WDFN-8L 2x3 and SOT-23-6 packages to achieve best solution for PCB space and total BOM cost saving considerations.


  • Cellular Phones
  • Digital Cameras
  • PDAs and Smart Phones
  • Portable Instruments
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
Status Indicator Yes
Charger Type Linear
Input Source AC Adapter;USB
Features Enable Input;Internal Compensation;OVP;Power Good;UVP
Package Type WDFN2x2-8;WDFN2x3-8;SOT-26
Built-in Power MOSFETs Yes
  • 28V Maximum Rating for AC Adapter
  • Internal Integrated Power FETs
  • AC Adapter Power Good Status Indicator
  • Programmed Charging Current
  • Charge Status Indicator
  • Programmed End of Charge Current
  • Under Voltage Protection
  • Over Voltage Protection
  • Thermal Feedback Optimizing Charge Rate
  • RoHS Compliant and Halogen Free
TitleLast UpdateDownload
Linear Single Cell Li-Ion Battery Charger with Input Over Voltage Protection2010/06/23
Title Last Update ShareDownload
Linear Single Cell Li-Ion Battery Charger with Input Over Voltage Protection 2015/05/19