Hot-Swap Controller for 1 to 16V Backplanes

Maxim Integrated Products has introduced the MAX5977, a hot-swap controller for 1 to 16V backplanes. This device features an integrated current-sense amplifier that provides a one per cent accurate current output over a 10 to 50mV input voltage range. This allows system designers to precisely monitor/measure load current in high-availability systems.

A calibration mode allows the current-sense amplifier to be fine-tuned for production testing of the design. The MAX5977 is suited for networking, base station, storage and computer server line cards requiring high reliability and precision current monitoring. It allows line cards to be safely inserted and removed from a live backplane without causing glitches on the system power-supply rail.

It is rated for 1 to 16V input and can withstand transients or inductive spikes up to 28V. An integrated charge pump drives a low-cost, external n-channel MOSFET. Variable speed/bi-level fault protection improves system reliability by quickly responding to overcurrent and short-circuit conditions, while preventing nuisance trips caused by noise or transient conditions.

The MAX5977A latches off after a fault condition, while the MAX5977B automatically restarts. Other features include: programmable undervoltage and overvoltage protection, an active-high power-good (open-drain) output and an active-low (open-drain) fault output. The MAX5977 is packaged in a 20-pin TQFN-EP and is fully specified over the -40 to 85C extended temperature range.

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