Automotive Relay Driver

May 24, 2007
The A2550 relay combines the functions of a voltage regulator, watch-dog, and reset, with three low-side DMOS relay driver outputs.

Primarily targeted at automotive applications, the IC performs over extended voltage and temperature ranges. The three DMOS outputs drive relay coils of up to 250 mA. Each driver has rugged voltage clamps that survive load dump pulses up to 48 V. The 40-V rating on VBB also ensures survival in automotive environments. A 5-V linear regulator provides 40 mA of current with a tolerance of 2% over the operating temperature range.

Allegro Microsystems Inc., 115 Northeast Cutoff, Worcester, MA 01606, (508) 255-3477,

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