ZHCSM42C may 2020 – april 2023 TPS543320
PRODUCTION DATA
The MODE pin is used to select between four different soft-start times, which is useful if a load has specific timing requirements for the output voltage of the regulator. A longer soft-start time is also useful if the output capacitance is very large and requires large amounts of current to quickly charge the output capacitors to the output voltage level. The large currents required to charge the capacitor can reach the current limit or cause the input voltage rail to sag due excessive current draw from the input power supply. Limiting the output voltage slew rate solves both of these problems. The example design has the soft-start time set to 1.0 ms. With this soft-start time, the current required to charge the output capacitors to the nominal output voltage is only 0.14 A.