[FAQ] BQ2575X: Input And Output Capacitors

Hello,

For the BQ2575X family, 80µF is the minimum after derating for the input and output capacitance. 160µF of input and output capacitance is based on meeting a ±3% transient response requirement.

Keep in mind, you'll also need to balance the capacitors across the RBAT_SNS and RAC_SNS resistors. It doesn’t need to be 1:1 across the resistor. You'll also need a small MLCC decoupling cap close to the switching FETs for both the input and output. A 1µF cap should work here. This cap will help filter out high frequency noise from the switching converter.

This advice will apply to all parts in the BQ2575X family.

Best Regards,
Ethan Galloway