The MAX5961 0 to 16V, quad, hot-swap controller provides
complete protection for systems with up to four
distinct supply voltages. The device allows the safe
insertion and removal of circuit cards into live backplanes.
The MAX5961 is an advanced hot-swap controller
that monitors voltage and current with an internal
10-bit ADC. The device provides two levels of overcurrent
circuit-breaker protection; a fast-trip threshold for a
fast turn-off, and a lower slow-trip threshold for a
delayed turn-off. The maximum overcurrent circuitbreaker
threshold range is set independently for each
channel with a trilevel input (ILIM_) or by programming
though an I2C interface.
The internal 10-bit ADC is multiplexed to monitor the
output voltage and current of each hot-swap channel.
The total time to cycle through all the eight measurements
is 100μs (typ). Each 10-bit value is stored in an
internal circular buffer so that 50 past samples of each
signal can be read back through the I2C interface at
any time or after a fault condition.
The MAX5961 can be configured as four independent
hot-swap controllers, hot-swap controllers operating in
pairs, or as a group of four hot-swap controllers.
The device also includes five digital comparators per
hot-swap channel to implement overcurrent warning,
two levels of overvoltage detection, and two levels of
undervoltage detection. The limits for overcurrent, overvoltage,
and undervoltage are user-programmable.
When any of the measured values violates the programmable
limits, an external ALERT signal is asserted. In
addition to the ALERT signal, depending on the selected
operating mode, the MAX5961 can deassert a
power-good signal and/or turn-off the external MOSFET.
The MAX5961 is available in a 48-pin thin QFN package
and operates over the -40°C to +85°C extended
temperature range.
Applications
PCI Express? Hot Plug
Servers
Disk Drives
Storage Systems
ASICs