The HIP1011A is the second PCI Hot Plug Voltage bus control IC from Intersil. A drop-in alternative to the widely used HIP1011, the HIP1011A has the same form, fit and function but additionally features an adjustable latch-off time of the MOSFET switches and fault reporting. Like the HIP1011, the HIP1011A creates a small and simple yet complete power control solution with discrete power MOSFETs and a few passive components. Four independent supplies are controlled, +5V, +3.3, +12V, and -12V. The +12V and -12V switches are integrated. For the +5V and +3.3V supplies, overcurrent (OC) protection is provided by sensing the voltage across external current- sense resistors. For the +12V and -12V supplies OC protection is provided internally. In addition, an on-chip reference is used to monitor the +5V, +3.3V and +12V outputs for undervoltage (UV) conditions. The PWRON input controls the state of the switches. During an OC condition on any output, or a UV condition on the +5V, +3.3V or +12V outputs, a LOW (0V) is asserted on the FLTN output and all MOSFETs are latched-off. The time to FLTN signal going LOW and MOSFET latch-off is determined by a single capacitor from the FLTN pin to ground. This added feature allows the system OS to complete housekeeping activities in preparation for an unplanned shut down of the affected card. The FLTN latch is cleared when the PWRON input is toggled low again. During initial power-up of the main VCC supply (+12
The HIP1011A is a PCI Hot Plug Voltage bus control IC that provides drop‑in replacement for the HIP1011 while adding adjustable latch‑off delay and fault reporting. It controls four supplies (+5 V, +3.3 V, +12 V, –12 V) and includes internal MOSFET switches for the ±12 V rails.
Key features include programmable over‑current thresholds, undervoltage detection, and a fault output (FLTN) that can be delayed with a single external capacitor. The datasheet supplies absolute maximum ratings, operating conditions, typical performance curves, and a complete pin‑out description for system designers.
| 5 V Undervoltage Trip Threshold (typ) | 4.65 V |
|---|---|
| VCC Supply Voltage Range | -0.5 V to +14.0 V |
The FLTN pin provides a fault output; it is a 5 V CMOS active‑low signal that indicates an over‑current or undervoltage condition.
It controls all PCI supplies: +5 V, +3.3 V, +12 V, and –12 V.
A capacitor connected from the FLTN pin to ground adds delay to the fault notification and power‑supply latch‑off.