SLUSFB0 August 2024 BQ25758S
PRODUCTION DATA
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The output capacitor conducts high ripple current. The output capacitor RMS ripple current is given by where the minimum VAC corresponds to the maximum capacitor current.
A 5-mΩ output capacitor ESR causes an output voltage ripple of 74 mV as given by:
A 140-μF output capacitor causes a capacitive ripple voltage of 66 mV as given by:
A combination of ceramic and bulk capacitors should be used to provide low ESR and high ripple current capacity. Ceramic capacitors should be placed close to the switching half-bridge. Given total bulk output capacitance, it is recommended to distribute equally on either side of RBAT_SNS. The complete schematic is a good starting point for CBAT for typical applications.