ZXCT1032

ZXCT1032 High-side inrush controller and electronic fuse Description The ZXCT1032 is a high-side current monitor that drives a PMOS or PNP transistor to provide in-rush current limit and over-current protection. The ZXCT1032 includes a high accuracy high-side current monitor, a start-up timer and a re-try inhibit timer. The ZXCT1032 takes the voltage developed across a current shunt resistor and compares this with an externally set trip point. It works in three modes: Linear soft-start Over-current detector Over-current disconnect/fuse While in this mode the internal current monitor continually checks the output current and compares it to the trip-current level determined by VISET. Over-current disconnect/fuse If the trip current limit is exceeded at any time the ZXCT1032 enters its Over-current disconnect mode. The drive pin is driven high, turning the pass MOSFET off; the flag output goes low indicating a fault. The drive and flag outputs are latched in these states for a period determined by CT, VISET and the internally set discharge current (3µA typical). After CT has discharged to 80mV the ZXCT1032 will restart into its linear soft-start mode. The CT charge and discharge times have been ratioed to so that the power dissipation in the pass MOSFET should allow indefinite operation in the event of a continuous load failure. Linear soft-start Upon power up the ZXCT1032 enters a linear soft-start mode. During which the output current ramps up from zero to a maximum us...