Micrel’s MIC2341 and MIC2342 devices are dual-channel hot-plug power controllers that support the power requirements for PCI Express Specification v2.0.

The devices support for 12V, 3.3V, and 3.3VAUX supplies and features include programmable gate voltage slew-rate control, voltage supervision, programmable current limit, and circuit breaker functions. 

The devices support two independent PCI Express 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. 

The ICs also 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(s) to remain active and accelerates debugging effort(s) when locating a faulty area(s) in the circuit. 

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. 

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