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TPS65320D-Q1: current path for recharging the bootstrap capacitor

Lenio Cacula
Genius 15900 points
Part Number: TPS65320D-Q1

By examining the block diagram and the description in the datasheet, it is not clear the exact path in which the current circulates to recharge the bootstrap capacitor. The DS mentions the low side diode, but I am not sure if that refers to the body diode of a second MOSFET shown in the block diagram or the external catch diode in the circuit. Can you please clarify the process of charging the bootstrap capacitor?

Thank you!

  • 0
    TI__Expert 8860 points

    Lenio,

      It's definitely the low side diode, not the body diode.

    7.3.1.4 Dropout Mode Operation and Bootstrap Voltage (BOOT)

    The TPS65320D-Q1 buck regulator has an integrated boot regulator and requires a small ceramic capacitor

    between the BOOT pin and the SW pin to provide the gate-drive voltage for the high-side MOSFET. The BOOT

    capacitor recharges when the high-side MOSFET is off and the low-side diode conducts. The value of this

    ceramic capacitor must be 0.1 μF. TI recommends a ceramic capacitor with an X7R or X5R grade dielectric and

    a voltage rating of 10 V or higher because of the stable characteristics over temperature and over voltage.

    Let me know if you need more information.