SNVSCH2 September 2024 LM65645-Q1
ADVANCE INFORMATION
The driver of the power switch (HS switch) requires bias higher than VIN when the HS switch is ON. The capacitor connected between BST and SW works as a charge pump to boost voltage on the BST terminal to (SW + VCC). The boot diode is integrated on the LM656x5-Q1 die to minimize the physical design size. TI recommends a 100nF capacitor rated for 10V with X7R or better dielectric for the BST capacitor.