This document describes a solution to control inrush current using the LT3467 ThinSOT TM switching regulator. The LT3467 integrates a soft-start function with a built-in 42V, 1.1A switch. By enabling the soft-start feature, the inrush current can be limited to prevent input source collapse and output overshoot.
The document addresses the problem of excessive inrush current when operating regulators from batteries or current-limited sources, which can cause input source collapse or fuse tripping. It presents a simple solution using the LT3467 ThinSOT switching regulator integrated with a soft-start function and a built-in 42V, 1.1A switch.
The device integrates a built-in switch rated at 42V and 1.1A.
It takes about 100us for the output to go from 0V to 12V.
The circuit requires an input current of about 0.85A peak to reach the output voltage.