A2550 Datasheet | Allegro MicroSystems

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 PACKAGE: 16 pin TSSOP (suffix LP) with exposed pad DESCRIPTION Large numbers of relay-based applications require the use of a microprocessor which implements plex system control. In these systems, there is the need for microprocessor logic supply voltage, power-on reset circuitry, and watchdog capabilities. The Allegro™ A2550 bines 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. Three low-side DMOS drivers can drive inductive loads, such as relay coils. Each driver integrates rugged voltage clamps which survive automotive load dump pulses up to 48 V. The 40 V rating on VBB also ensures adequate survival in harsh automotive environments. A 5 V linear regulator provides 40 m A of output current, with a tolerance of 2% over the operating temperature range. To enhance the usefulness of the IC in automotive applications, the 5 V regulator output, as well as the three low-side driver outputs are protected against overcurrent conditions. Not to scale Continued on the next page… System Logic Typical Application IN1 OUT1 IN2 OUT2 3 IN3 A2550 OUT3 14 LGND PGND NPOR...