ZHCSCY3E October 2014 – October 2018 LM5160 , LM5160A
The VCC capacitor charges the bootstrap capacitor during the off-time of the high-side switch and powers internal logic circuits and the low-side sync FET gate driver. The bootstrap capacitor biases the high-side gate driver during the high-side FET on-time. Recommended values for C5 (CVCC) and C4 (CBST) are 1 µF and 10 nF, respectively. Both must be high-quality X7R ceramic capacitors.