The CW6307 is a high accuracy linear charger IC with power path management for Wearables and IoT devices using single-cell Li-ion/Li-Polymer

batteries.

The device embeds a charge management block and fulfills full charge phases, including pre-charge, fast charge constant current (CC), fast charge

constant voltage (CV) and charge termination.

The device integrates power path management(PPM) that allows the device to provide power for the system running while charging the battery even

with a depleted battery. It also supports full system reset and ship mode.

The CW6307 provides system over current protection (OCP) by limiting the current from the input to the system and that from the battery to the system. The battery to system discharging path will

be cut off when battery voltage is lower than the battery under voltage lockout (UVLO) threshold.

The CW6307 could monitor the battery pack temperature via the NTC pin (10K or 100K NTC thermistor supported) and suspend charging once the battery is in hot or cold condition. The device also integrates charge safety timer and pre-charge timer. The ongoing charge will be turned off when either of the two is expired. An I2C control interface

allows the host to configure charger parameters and also get the IC status. I2C watchdog is available during charge and discharge.

The device is available in a tiny lead-free 0.5mm pitch, 1.55mm x 1.55mm, 9-ball WLCSP package.

  • +28V Maximum Voltage for Input Source

  • Configurable 3.85V-4.6V CV Regulation

  • ±0.5% CV Regulation Accuracy

  • Configurable 10mA-470mA CC Charging

  • Down to 1mA Termination Current

• Power Path Management

  • System Reset and Ship Mode Supported

  • Battery Supplement Mode Supported

• Configurable Input Voltage Regulation and Input Current Limit up to 500mA

• NTC Thermistor Monitor Supported

• OCP in Discharge and Supplement Mode

• Charge Safety Timer and Pre-charge Timer

• Watchdog during Charge and Discharge

• Ultra-Low Battery Quiescent Current:

  • 5µA in Normal Mode

  • 500nA in Ultra Low Power Mode

  • 300nA in Ship Mode

• I2C Serial Interface

• Lead-free, 1.55mmx1.55mm WLCSP-9 package