SNVSB97A December 2018 – September 2021 LM34936-Q1
In Boost mode, the output capacitor conducts high ripple current. The output capacitor RMS ripple current is given by Equation 16 where the minimum VIN corresponds to the maximum capacitor current.
In this example, the maximum output ripple RMS current is ICOUT(RMS) = 6 A. A 5-mΩ output capacitor ESR causes an output ripple voltage of 60 mV as given by:
A 400-µF output capacitor causes a capacitive ripple voltage of 25 mV as given by:
Typically, a combination of ceramic and bulk capacitors is needed to provide low ESR and high ripple current capacity. The complete schematic in Figure 8-1 shows a good starting point for COUT for typical applications.