The ISL6111 is a power switch controller designed for PCI and PCI-X applications, providing protection for the motherboard against abnormal PCI load cards. It controls the power supplies (+12V, -12V, +5V, +3.3V) to a PCI or PCI-X slot and integrates current sensing and regulation switches for +12V and -12V. It offers current regulation protection by sensing voltage and modulating gate voltage bias on external N-channel power MOSFETs for the 3.3V and 5V rails.
The ISL6111 is a PCI and PCI‑X hot‑plug controller that protects motherboard power rails (+12 V, –12 V, +5 V, +3.3 V) by actively regulating current. It integrates internal MOSFET switches for the ±12 V rails and works with external MOSFETs for the +5 V and +3.3 V supplies.
Key features include programmable current‑regulation levels via the CRSET pin, fast over‑current response (100 ns), and open‑drain status outputs (PGOOD, FLTN). The device is supplied in a QFN package (L20.5 × 5 mm) and is rated for up to 150 °C junction temperature.
| Package Type | Quad Flat No‑Lead (QFN) L20.5×5 mm |
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The ENABLE input controls all four internal and external switches and prevents turn‑on until the bias voltage exceeds 10 V.
PGOOD is an open‑drain output that goes high when all positive voltage outputs are above the minimum PCI specification.