The MAX5954 hot-plug controller is designed for PCI Express™ applications. The device provides hot-plug control for 12V, 3.3V, and 3.3V auxiliary supplies of a single PCI Express (PCI-E) slot. The MAX5954’s logic inputs/outputs allow interfacing directly with the system hot-plug management controller or through an SMBus™ with an external I/O expander. Integrated debounced attention switch and present-detect signals are included to simplify system design. The MAX5954 drives two external n-channel MOSFETs to control the 12V and 3.3V main outputs. The 3.3V auxiliary output is controlled through an internal 0.3Ω n-channel MOSFET. An internal charge pump provides gate drive for the 12V output while the gate drive of the 3.3V output is driven by the 12V input supply. The 3.3V auxiliary output is completely independent from the main outputs with its own charge pump. At power-up, the MAX5954 keeps all of the external MOSFETs off until the supplies rise above their respective undervoltage-lockout (UVLO) thresholds. The device keeps the internal MOSFET off only until the auxiliary input supply rises above its UVLO threshold. Upon a turn-on command, the MAX5954 enhances the external and internal MOSFETs slowly with a constant gate current to limit the power-supply inrush current. The MAX5954 actively limits the current of all outputs at all times and shuts down if an overcurrent condition persists for longer than a programmable overcurrent timeout.
The MAX5954 is a single‑PCI‑Express hot‑plug controller that manages 12 V, 3.3 V, and 3.3 V auxiliary supplies. It includes integrated logic, MOSFET drivers, and SMBus control, providing active current limiting, over‑temperature protection, and programmable timeout features.
The datasheet provides absolute maximum ratings, detailed electrical characteristics for the 12 V and 3.3 V rails, typical operating curves, and a thin‑QFN package drawing. Ordering information and a typical application circuit are also included.
| 12 V Supply Voltage Range | 10.8 V – 13.2 V |
|---|---|
| 3.3 V Supply Voltage Range | 3.0 V – 3.6 V |
| Operating Temperature Range | -40 °C – +85 °C |
| Package Type | 36‑pin thin QFN (6 mm × 6 mm) |
The device operates from –40 °C up to +85 °C.
It is supplied in a 36‑pin thin QFN package measuring 6 mm × 6 mm.