Elec-component
BQ24745RHDR
BQ24745RHDR

 

BQ24745RHDR

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Category: Elec-component Available (Qty:9999999)
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Description

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SMBus-Controlled Level 2 Multi-Chemistry Battery Charger With Input Current Detect Comparator

Parameter Symbol Min Typical Max Unit Description
Input Voltage Range VIN 4.0 - 16 V Operating input voltage range
Charging Voltage VCHG 3.0 - 4.9 V Adjustable charging voltage
Charging Current ICHG 0.1 - 3.0 A Programmable charging current
Pre-charge Current ITRK 0.1 - 1.5 A Programmable pre-charge current
Battery Regulation Voltage VREG 3.0 - 4.9 V Battery regulation voltage
System Voltage VSYS 3.0 - 5.5 V System output voltage
Battery Disconnect Voltage VDISC 2.0 - 4.5 V Battery disconnect voltage
Thermal Regulation TREG -40 - 125 °C Temperature range for thermal regulation
Efficiency η - 94 - % Typical efficiency at 5V/1A input, 5V/1A output
Quiescent Current IQ 0.0 30 50 μA Quiescent current during charging
Shutdown Current ISD 0.0 1.0 2.0 μA Shutdown current
Package - - - - 8-Pin SOIC Package type

Instructions for Using BQ24745RHDR

  1. Power Supply Connection:

    • Connect the input power supply to the VIN pin.
    • Ensure the input voltage is within the specified range (4.0V to 16V).

  2. Battery Connection:

    • Connect the battery to the BAT pin.
    • Set the charging voltage (VCHG) and current (ICHG) using external resistors or through I2C communication.

  3. System Output Configuration:

    • The system output voltage (VSYS) can be set to match the required system voltage.
    • Connect the system load to the SYS pin.

  4. Pre-charge Configuration:

    • Set the pre-charge current (ITRK) to a suitable value for the battery being charged.

  5. Thermal Regulation:

    • The device will automatically reduce the charging current if the temperature exceeds the thermal regulation threshold.

  6. Efficiency Considerations:

    • For optimal efficiency, ensure that the input and output voltages are as close as possible.

  7. Quiescent and Shutdown Current:

    • Monitor the quiescent and shutdown currents to ensure minimal power loss when the device is not actively charging.

  8. I2C Communication:

    • Use the I2C interface to configure advanced parameters and monitor the charging status.
    • Connect the SDA and SCL pins to the I2C bus of your microcontroller.

  9. Protection Features:

    • The device includes overvoltage, overcurrent, and thermal protection.
    • Ensure that the battery disconnect voltage (VDISC) is set appropriately to prevent over-discharge.

  10. Layout Considerations:

    • Place the device close to the battery and power supply to minimize parasitic inductance and resistance.
    • Use proper decoupling capacitors on the VIN and BAT pins to ensure stable operation.

  11. Testing and Validation:

    • Test the device with different batteries and input voltages to verify its performance.
    • Use a multimeter to measure the charging current and voltage to ensure they match the expected values.

For detailed application notes and further information, refer to the datasheet provided by Texas Instruments.

(For reference only)

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