The RT9469WSC 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 RT9469WSC also features USB On-The-Go (OTG) support. The RT9469WSC 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 RT9469WSC 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 RT9469WSC is available in the small WL-CSP-25B 2.52x2.52 packages.
Feature
- 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 Adapter : 4V/4.25V/4.5V/4.75V► For 9V Adapter : 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 2.275A 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
Applications
- Cellular Telephones
- Personal Information Appliances
- Tablet PC, Power Bank
- Portable Instruments
