SLVSCG3F January 2014 – July 2017 TPS22968
When the switch turns on into a discharged load capacitor or short-circuit, a capacitor must be placed between VIN and GND to limit the voltage drop on the input supply caused by transient inrush currents. A 1-µF ceramic capacitor (CIN), placed close to the pins, is sufficient. Higher values of CIN can be used to further reduce the voltage drop during high-current application. When switching heavy loads, TI recommends having an input capacitor 10x higher than the output capacitor to avoid excessive voltage drop.