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Power controllers suit mission-critical apps

Posted: 21 Jan 2008     Print Version  Bookmark and Share

Keywords:power controller  PCIe 2.0  embedded system 

MIC2341/42

Micrel Inc. has released the MIC2341 and MIC2342 dual channel hot-plug power controllers that support the power requirements for PCIe 2.0.

The devices are suitable for high performance enterprise computing network system processor boards, DDR memory boards, embedded systems and GbE add-in cards for the server networks and RAID/storage network markets. The devices are currently available in volume quantities and are priced at Rs.179.23 ($4.54) for 1K quantities.

The MIC2341 and MIC2342 provide support for 12V, 3.3V, and 3.3VAUX supplies. The devices feature programmable gate voltage slew-rate control, voltage supervision, programmable current limit, and circuit breaker functions. The controller also support two independent PCIe slots, offer integrated power MOSFETs for 3.3VAUX rails with low backfeed on the MAIN +12V and +3.3V rails, an important consideration during standby operation for Wake-on-LAN applications.

In addition, the ICs offer dual-level, dual-speed overcurrent fault protection and a user-programmable primary overcurrent filter to eliminate nuisance tripping. Separate MAIN and AUX overcurrent fault output signals and load card detection (present) switch inputs are also offered. Power will be delivered only when the module/card is fully inserted and power fault isolation allows an unaffected power rail to remain active and accelerates debugging effort when locating a faulty area in the circuit.

The power controllers also provide system management flexibility in offering either a latched or auto-retry option. The MAIN output rails of the MIC2342 shut down during an overcurrent fault on AUX for a given slot, whereas MAIN outputs of the MIC2341are independent of an overcurrent fault occurring on AUX.

"The MIC2341 and MIC2342 both offer an integrated solution that minimises solution component count and lower overall BOM cost," noted Andy Cowell, Micrel's marketing VP for analogue products. "In addition, both ICs feature very rapid response times to potentially catastrophic overcurrent load events, key in mission-critical applications for the server and RAID/storage network markets."

Both ICs are available in RoHS compliant 48-pin TQFP Pb-free.




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