Description

Large numbers of relay-based applications require the use of a microprocessor which implements complex system control. In these systems, there is the need for microprocessor logic supply voltage, power-on reset circuitry, and watchdog capabilities. The Allegro® A2550 combines the functions of voltage regulator, watchdog, and reset, as well as three low-side DMOS relay driver outputs. Primarily targeted at automotive applications, this IC is designed to provide robust performance over extended voltage and temperature ranges.

Features and Benefits

▪ Three independent low-side DMOS output drivers

▪ Short-circuit protection of drivers

▪ Eliminates need for flyback diodes on relays

▪ Thermal shutdown

▪ Separate precision 5 V regulator (2)

▪ Current clamp on 5 V regulator

▪ 16-pin TSSOP package with exposed thermal pad

▪ Programmable reset (NPOR) delay time

▪ Programmable watchdog

▪ Automotive voltage and temperature ranges

▪ Active clamps for automotive load dump specifications

▪ Lead (Pb) free