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Data Sheet

FULL DATA SHEET (PDF, 1.1MB) Download   E-Mail

Description

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 MOSFETs to control the 12V and 3.3V main outputs. The 3.3V auxiliary outputs are controlled through internal 0.3 n-channel MOSFETs. Internal charge pumps provide gate drive for the 12V outputs while the gate drive of the 3.3V output is driven by the 12V input supply. The 3.3V auxiliary outputs are completely independent from the main outputs with their own charge pumps. At power-up, the MAX5946 keeps all of the external MOSFETs off until the supplies rise above their respective undervoltage lockout (UVLO) thresholds. The device keeps the internal MOSFETs off only until the auxiliary input supply rises above its UVLO threshold. Upon a turn-on command, the MAX5946 enhances the external and internal MOSFETs slowly with a constant gate current to limit the power-supply inrush current. The MAX5946 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. Thermal-protection circuitry also shuts down all outputs if the die temperature exceeds +150°C. After an overcurrent or overtemperature fault condition, the MAX5946L latches off while the MAX5946A automatically restarts after a restart time delay. The device is available in a 36-pin (6mm x 6mm) thin QFN package and operates over the -40°C to +85°C temperature range.

Key Features		Applications/Uses
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-bar Signal Outputs with Programmable Power-On Reset (POR) (160ms Default) Latched FAULT-bar 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		Desktop/Mobile Server Platforms Embedded Devices Servers Workstations

Evaluation Kits

MAX5946LEVCMODU, MAX5946LEVKIT

Reliability Reports

Show FIT data for: MAX5946 Reliability Report: MAX5946xETx.pdf MAX5946AxETx.pdf MAX5946LxETx.pdf

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-8 of 8
MAX5946A	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX5946AETX			THIN QFN;36 pin; Dwg: 21-0141 (PDF) Use pkgcode/variation: T3666-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5946AETX-T			THIN QFN;36 pin; Dwg: 21-0141 (PDF) Use pkgcode/variation: T3666-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5946AETX+			THIN QFN;36 pin; Dwg: 21-0141 (PDF) Use pkgcode/variation: T3666+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5946AETX+T			THIN QFN;36 pin; Dwg: 21-0141 (PDF) Use pkgcode/variation: T3666+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5946L	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX5946LETX			THIN QFN;36 pin; Dwg: 21-0141 (PDF) Use pkgcode/variation: T3666-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5946LETX-T			THIN QFN;36 pin; Dwg: 21-0141 (PDF) Use pkgcode/variation: T3666-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5946LETX+			THIN QFN;36 pin; Dwg: 21-0141 (PDF) Use pkgcode/variation: T3666+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5946LETX+T			THIN QFN;36 pin; Dwg: 21-0141 (PDF) Use pkgcode/variation: T3666+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2004-11-23

Related Products

MAX5915, MAX5915A, MAX5916, MAX5916A Dual PCI 2.2 Hot-Swap Controllers

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