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How-swap IC integrates Hall-effect current sensing

Posted: 16 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:hot-swap protection IC? Hall-effect current sensing? integrated controller?

Allegro MicroSystems Inc.'s ACS760 hot-swap protection IC is designed for 12V hot-swap applications.

The ACS760 integrated controller combines Allegro's Hall-effect current sensing technology with hot-swap control circuitry. No external sense resistor is required, resulting in reduced I2R losses in the power path. ACS760 incorporates an external high-side FET gate drive and produces an analog output voltage (factory trimmed for gain and offset), which is proportional to the applied current. The user-controlled soft-start/hot-swap function is accessed via the logic 'enable' input pin. When the ACS760 is externally enabled and the voltage rail is above the internal under-voltage lockout threshold, the internal charge pump drives the gate of the external FET. When a fault is detected, the gate is disabled while simultaneously alerting the application that a fault has occurred.

Three levels of fault protection are integrated within the ACS760: 240 VA power fault protection with user-programmable delay, user-programmable overcurrent fault threshold with programmable delay and short-circuit protection, which disables the gate in less then 2?Cs.

In the event of the external high-side FET failing in a short-circuit condition, ACS760 detects the failure, immediately disables the gate and alerts the host system. The IC is designed for single-supply operation from 10.8V to 13.2V. It is protected against electrostatic discharge at up to 2kV for all pins.

Allegro's ACS760 is supplied in 24-lead QSOP package (suffix LF), which is Pb-free and RoHS compliant. Operating temperature range is -40C to 85C.

Pricing for the devices start at $4 each in quantities of 1,000. Availability is 12-week typical lead-time to market.

- Ismini Scouras

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