GENERAL DESCRIPTION
FEATURES
♦ PCI Express Compliant ♦ Hot Swaps 12V, 3.3V, and 3.3V Auxiliary for a Single PCI-E Slot ♦ Integrated Power MOSFET for Auxiliary Supply Rail ♦ Controls dI/dt and dV/dt ♦ Active Current Limiting Protects Against Overcurrent/Short-Circuit Conditions ♦ Programmable Current-Limit Timeout ♦ PWRGD Signal Output with Programmable Power-On Reset (POR) (160ms Default) ♦ Latched FAULT Signal Output after Overcurrent or Overtemperature Fault ♦ Attention Switch Input/Output with 4.4ms Debounce ♦ Present-Detect Input ♦ Forced-On Input Facilitates Testing ♦ Thermal Shutdown ♦ Allows Control through SMBus with an I/O Expander MAX5954 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.
Maxim Integrated
