ZHCSH69 December 2017 TPS40345
PRODUCTION DATA.
Per the TPS40345 data sheet, a minimum 1-uF ceramic capacitance is required to stabilize the BP regulator. To limit regulator noise to less than 10 mV, the value of the bypass capacitor is calculated in Equation 15.
Because Q2 is larger than Q1, and the total gate charge of Q2 is 10 nC, a BP capacitor of 1 µF is calculated. A standard value of 1 µF is selected to limit noise on the BP regulator.