Triple PCI Express, Hot-Plug Controllers

Active: In Production.

The MAX5957/MAX5958 triple hot-plug controllers are designed for PCI Express (PCIe)® applications. These devices provide hot-plug control for 12V, 3.3V, and 3.3V auxiliary supplies of three PCIe slots. The MAX5957/MAX5958s' logic inputs/outputs allow interfacing directly with the system hot-plug management controller or through an SMBus™ with an external I/O expander such as the MAX7313. An integrated debounced attention switch and present-detect signals simplify system design.

The MAX5957/MAX5958 drive six external n-channel MOSFETs to control the 12V and 3.3V main outputs. The 3.3V auxiliary outputs are controlled through 0.2Ω n-channel MOSFETs. Internal charge pumps provide the gate drive for the 12V outputs while the gate drive of the 3.3V output is driven by the 12V input supply clamped to 5.5V above the respective 3.3V main supply rail. The 3.3V auxiliary outputs are completely independent from the main outputs with their own charge pumps.

At power-up, the MAX5957/MAX5958 keep all the MOSFETs (internal and external) off until the supplies rise above their respective undervoltage lockout (UVLO) thresholds. Upon a turn-on command, the MAX5957/MAX5958 enhance the external and internal MOSFETs slowly with a constant gate current to limit the power-supply inrush current.

The MAX5957/MAX5958 actively limit the current to protect all outputs at all times and shut down if an overcurrent condition occurs. After an overcurrent fault condition, the MAX5957L/MAX5958L latch off while the MAX5957A/MAX5958A automatically restart after a restart time delay. The MAX5957/MAX5958 are offered in latch-off or autorestart versions (see the Selector Guide located in the full data sheet).

The MAX5957/MAX5958 are available in a 56-pin TQFN package and operate over the -40°C to +85°C temperature range.

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