Press Release Summary:
Combining Hall-effect current sensing with hot-swap control circuitry, Model ACS760 incorporates external high-side FET gate drive, and produces analog output voltage proportional to applied current. User-controlled soft-start/hot-swap function is accessed via logic enable input pin. Housed in QSOP package, unit is designed for single-supply operation from 10.8-13.2 V. It has 1.5 mW internal conductor resistance and is protected against ESD at up to 2 kV for all pins.
Original Press Release:
Allegro Introduces a New Hot-Swap Protection IC Using Hall-Effect Current Sensing
Worcester, MA, July 2, 2007 - Allegro MicroSystems, Inc. new ACS760 hot-swap protection IC is designed for 12 V hot-swap applications. The new device combines Allegro's Hall-effect current sensing technology with hot-swap control circuitry, resulting in a highly efficient integrated controller. No external sense resistor is required, resulting in greatly reduced I2R losses in the power path.
The 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 µs.
In the event of the external high-side FET failing in a short-circuit condition, the ACS760 detects the failure, immediately disables the gate, and alerts the host system. The IC is designed for single-supply operation from 10.8 V to 13.2 V, and has 1.5 mW internal conductor resistance. It is protected against electrostatic discharge at up to 2 kV for all pins.
Allegro's ACS760 is supplied in 24-lead QSOP package (suffix LF), which is lead (Pb) free and RoHS compliant. Operating temperature range is -40°C to +85°C. It is priced at $4.00 in quantities of 1,000 and has a 12-week typical lead-time to market. For more information on this device please access the following link: vocuspr.vocus.com/VocusPR30/Url.aspx?516867x1421x53911
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Allegro MicroSystems, Inc. is a global leader in the developing, manufacturing and marketing of high-performance power integrated circuits and integrated Hall-effect magnetic sensors. Allegro's innovative, system-level solutions serve high-growth applications within the automotive, computer/office automation, industrial, consumer and communications markets. With more than 2,500 employees, Allegro is headquartered in Worcester, MA. Further information about Allegro can be found at www.allegromicro.com.