ISL6161

DATASHEET ISL6161 Dual Power Distribution Controller The ISL6161 is a hot swap dual supply power distribution controller that can be used in PCI Express (PCIe) applications. Two external N-channel MOSFETs are driven to distribute and control power while providing load fault isolation. At turn-on, the gate of each external N-channel MOSFET is charged with a 10µA current source. Capacitors on each gate create a programmable ramp (soft turn-on) to control in-rush currents, as Figure 1 shows. A built-in charge pump supplies the gate drive for the 12V supply N-channel MOSFET switch. Two external current sense resistors and FETs provide overcurrent (OC) protection. When the current through either resistor exceeds the user programmed value, the controller enters Current Regulation mode. The timeout capacitor, CTIM, starts charging as the controller enters the timeout period. When CTIM charges to a 2V threshold, both N-Channel MOSFETs are latched off. In the event of a hard and fast fault of...