New Automotive Grade Relay Driver


Allegro introduces a new automotive relay driver with 5 V regulator to complement their existing family of relay drivers. Large numbers of relay-based applications require the use of a microprocessor that implements a complex system control. In these systems there is the need for microprocessor logic supply voltage, power-on reset circuitry, and watch-dog capabilities. Allegro’s A2550 combines the functions of a voltage regulator, watch-dog 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 are meant to drive relay coils of up to 250 mA each. Each driver integrates rugged voltage clamps that 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 mA of output current with a tolerance of 2% over the operating temperature range. To enhance the IC's usefulness in automotive applications, the 5 V regulator output as well as the three low-side driver outputs are protected against over-current conditions. The A2550 also includes power-on reset circuitry (NPOR) as well as an integrated watch-dog circuit. Combined, they service the monitoring and reset requirements of a system microprocessor.

Allegro’s A2550 is priced at $1.00 in quantities of 1,000 and has a 12 week lead-time to market.

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