BQ2057WSN

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ADVANCED LINEAR CHARGE MANAGEMENT IC FOR SINGLE AND TWO CELL LITHIUM-POLYMER

Instructions for Using BQ2057WSN

1. Power Supply Connection:

   • Connect the input voltage (VIN) to the power source.
   • Ensure the input voltage is within the range of 2.9V to 13.2V.

2. Battery Connection:

   • Connect the battery to the VBAT pin.
   • Ensure the battery voltage is within the range of 2.5V to 4.5V.

3. Setting Charging Parameters:

   • Set the charging current (ICHG) using the appropriate external resistors or control inputs.
   • Set the regulation voltage (VREG) to the desired battery voltage level.

4. Thermal Management:

   • The device will automatically shut down if the temperature exceeds 125°C.
   • The device will regulate the charging current if the temperature exceeds 100°C to prevent overheating.

5. Termination Current:

   • Set the termination current (ITERM) to the desired value to ensure proper charge termination.

6. Discharge Power Management:

   • Set the discharge power management voltage (VDPM) and current (IDPM) to protect the battery during discharge.

7. Power-On Delay:

   • The device has a power-on delay time (TPD) of 0.5 to 1.5 milliseconds to ensure stable operation.

8. Watchdog Timer:

   • The watchdog timer period (TWD) is set to 200 to 400 milliseconds to monitor system operation and prevent lockup.

9. Monitoring and Control:

   • Use the status and control pins to monitor the charging and discharging process and to control the device as needed.

10. Safety Considerations:

    • Always ensure that the input and output voltages and currents are within the specified limits to avoid damage to the device or the battery.
    • Follow the recommended layout guidelines to ensure optimal performance and reliability.