MAX5946

19-3483; Rev 0; 11/04 KIT ATION EVALU LE B A IL A AV Dual PCI Express, Hot-Plug Controller General Description Features ♦ PCI Express Compliant ♦ Hot Swaps 12V, 3.3V, and 3.3V Auxiliary for 2 PCI-E Slots ♦ Integrated Power MOSFET for Auxiliary Supply Rails ♦ Controls dI/dt and dV/dt ♦ Active Current Limiting Protects Against Overcurrent/Short-Circuit Conditions ♦ Programmable Current-Limit Timeout ♦ PWRGD Signal Outputs with Programmable Power-On Reset (POR) (160ms Default) ♦ Latched FAULT Signal Output after Overcurrent or Overtemperature Fault ♦ Attention Switch Inputs/Outputs with 4ms Debounce ♦ Present-Detect Inputs ♦ Forced-On Inputs Facilitates Testing ♦ Thermal Shutdown ♦ Allows Control through SMBus with an I/O Expander MAX5946 Applications Servers Desktop Mobile Server Platforms Workstations Embedded Devices PRES-DETA FONA ONA AUXONA 12SA+ 12SA12GA 3.3SA+ 3.3SA1 2 3 4 5 6 7 8 9 36 35 34 33 32 31 30 29 28 PGND GND TOP VIEW 12VIN INPUT1 OUTPUT1 OUTPUT2 INPUT2 TIM PORADJ The MAX5946 dual hot-plug controller is designed for PCI Express™ applications. The device provides hotplug control for 12V, 3.3V, and 3.3V auxiliary supplies of two PCI express slots. The MAX5946’s logic inputs/outputs allow interfacing directly with the system hot-plug management controller or through an SMBus™ with an external I/O expander. An integrated debounced attention switch and present-detect signals are included to simplify system design. The MAX5946 drives four external n-channel M...