The ISL6113, ISL6114 both target the PCI-Express Add-in card hot swap application. Together with a pair of N-Channel and P-Channel MOSFETs, and two sense resistors per slot, either provides compliant hot plug power control to any combination of two PCI-Express X1, X4, X8 or X16 slots.
The ISL6113, ISL6114 feature a programmable current regulated (CR) maximum level for a programmable period to each voltage load so that both fault isolation protection and imperviousness to electrical transients are provided.
For each +12V supply, the CR level is set by a resistor value depending on the needs of the PCI-Express connector (X1, X4, X8 or X16) to be powered. This resistor is a sub-ohm standard value current sense resistor one for each slot and the voltage across this resistor is compared to a 50mV reference providing a nominal CR protection level adequately above the specific slot maximum limits. The 3.3V supply uses a 15mΩ sense resistor compared to a 50mV reference to provide 3.3A of maximum regulated current to all connector sizes. The 3.3VAUX is internally monitored and controlled to provide a nominal maximum of 1A of AUX output current.
The CR period for each slot is set by a separate external capacitor on the associated CFILTER pin. Once the CR period has expired, the IC then quickly turns off its associated FETs thus unloading the faulted card from the supply voltage rails. A nominal 3.3V must always be present on the AUXI pin for proper IC bias; this should be the 3.3VAUX supply if used, if not the AUXI pin is tied directly to the 3VMAIN supply. Both ICs employ a card presence detection input that disables the MAIN and AUX enabling inputs if it is not pulled low. Output voltage monitoring with both PCI-E Reset Not and Power Good Not reporting along with OC Fault reporting are provided. Whereas the ISL6113 has the same GATE drive and response characteristics as the ISL6112, the ISL6114 has a lower turn-on GATE drive current allowing for the use of smaller compensation capacitors and thus much faster response to Way Overcurrent (WOC) conditions. Additionally, the ISL6114 does not turn-on with the CR feature invoked as do the ISL6112, ISL6113 allowing for shorter CR programmed periods.The ISL6113, ISL6114 are footprint compatible for all common pins, but not entirely function compatible with the ISL6112's QFN package as there are I/O differences. |
