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Switch-Mode Single Cell Li-Ion Charger with USB-OTG

RT9460

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The RT9460 is a switch-mode single cell Li-Ion/Li-Polymer battery charger for portable applications. It integrates a synchronous PWM controller, power MOSFETs, input current sensing and regulation, and high accuracy voltage regulation and charge termination circuits. Besides, the charging current is regulated through the integrated sensing resistors. The RT9460 also features USB On-The-Go (OTG) support.

The RT9460 optimizes the charging task by using a control algorithm to vary the charge rate via different modes, including pre-charge mode, fast charge mode, and constant voltage mode. The key charge parameters are programmable via the I2C interface. The RT9460 resumes the charge cycle whenever the battery voltage falls below an internal recharge threshold, and automatically enters sleep mode when the input power supply is removed.

Other features include under-voltage protection, over- voltage protection, thermal regulation and reverse leakage protection.

The RT9460 is available in the small WL-CSP-25B 2.52x2.52 packages.

Applications

  • Cellular Telephones
  • Personal Information Appliances
  • Tablet PC, Power Bank
  • Portable Instruments
  • Internet of Things
Key Spec.
RT9460
Status Active
Vin (min) (V) 4.3
Vin (max) (V) 9
Battery Charge Voltage (max) (V) 4.62
Battery Charge Current (max) (A) 3.125
Status Indicator Yes
Charger Type Switching
Input Source AC Adapter;USB
Features Adjustable Frequency;Cycle-by-Cycle Current Limit;OCP;OVP;UVP
Package Type WL-CSP2.52x2.52-25(BSC)
Built-in Power MOSFETs Yes
Features
  • High Accuracy Voltage/Current Regulation
  • Average Input Current Regulation (AICR) : 0.1/0.15/0.5/ to 3A per 0.1A
  • Minimum Input Voltage Regulation
    ► For 5V Adaptor : 4V/4.25V/4.5V/4.75V
    ► For 9V Adaptor : 7V/7.5V/8V/8.5V
  • Charge Current Regulation Accuracy : ±5%
  • Charge Voltage Regulation Accuracy : ±1% (0 to 85°C)
  • Integrated Power MOSFETS for up to 3.125A Charge Rate
  • Support USB Charging Detection
  • Battery Temperature Sensing
  • Synchronous 0.75/1.5MHz Fixed Frequency PWM Controller with Up to 95% Duty Cycle
  • Reverse Leakage Protection to Prevent Battery Drainage
  • Thermal Regulation and Protection
  • Over Temperature Protection
  • Input Over Voltage Protection
  • IRQ Output for Communication with I2C
  • Automatic Charging
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateShareDownload
Switch-Mode Single Cell Li-Ion Charger with USB-OTG2016/12/19
Technical Documents
TitleLast UpdateShareDownload
Power IC Solutions for IoT/Portable/Wearable/Battery-Powered Applications2018/11/15
Switching Battery Chargers2017/10/18
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT9460WSCWL-CSP2.52x2.52-25(BSC)3000 Not available Buy from Distributor
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