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Micrel IC supports various PCI hot-plug standards

Posted: 10 May 2004 ?? ?Print Version ?Bookmark and Share

Keywords:mic259x? power controller ic? micrel semiconductor? mic2590b? mic2593?

The latest addition to the MIC259x family of hot swap power controller ICs from Micrel Semiconductor is designed to support various PCI hot-plug standards.

According to the company, the MIC2593, a five-rail-by-dual-slot power controller, supports all system voltages required by PCI v2.3 and PCI-X 1.0b, including the 3.3V auxiliary voltage. It provides all major power control functions for dual-slot PCI-X 2.0 applications, and supports 12V, -12V, 3.3V, 5V, and -3.3V auxiliary supplies with overcurrent protection.

An SMBus interface is also incorporated to allow for sophisticated power control and fault monitoring/reporting. The specific cause of a fault in any of a slot's five supplies is recorded in internal registers and is accessible via the SMBus interface, offering the system design engineer comprehensive system diagnostic capabilities.

The device integrates all the necessary circuitry for controlling external MOSFETs for the high-current 5V and 3.3V rails. For the 12V, the -12V, and the 3.3Vaux rails, the MIC2593 also integrates all control circuitry, current sense, and power MOSFETs.

Offering adjustable overcurrent timeout, electronic circuit-breaker fault protection, input under voltage lockout, output voltage monitoring and output voltage slew rate control, the controller has internal overcurrent detection circuits that regulate the output current, ensuring that inrush current never exceeds the programmed threshold. Micrel said that this feature improves the performance of a system with highly capacitive loads associated with many PCI adapter cards.

For applications that wish to support the Integrated Platform Management Interface (pursuant to IPMI v1.0), Micrel also offers the MIC2590B, which is a five-rail-by-dual slot power controller with an integral analog MUX and 8-bit delta-sigma ADC. In this device, conversion results for voltage and current for any of a slot's five supply rails is available via the SMBus interface.

Housed in a 48-pin TQFP package, the MIC2593 is available for $6.10 each when purchased in 1,000-piece tape and reel OEM quantities.

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