MAX5946, MAX5946A, MAX5946L Dual PCI Express, Hot-Plug Controller

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.

An evaluation kit is available: MAX5946LEVCMODU, MAX5946LEVKIT

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

Key Specifications: Hot Swap Controllers

Part Number

V_IN
(V)

Low Volt.

High Volt.

Voltage Polarity

Type

Fault Condition Control

Features

Package/Pins

Price

min

max

See Notes

MAX5946

13.2

Yes

Positive

Positive, Low-Voltage

Latched Off

Periodic Retry

125mA Fast Gate Pulldown Current

Adjustable Auto-Retry Duty Cycle and Circuit-Breaker Timeout

Auto-Retry Fault Management

Dual PCI-Express

On/Off Control

Power-Good Output (Active-Low)

Programmable Start-Up, Overcurrent, and Load-Disconnect Timeouts

TQFN/36

$3.43 @1k

See All Hot Swap Controllers (47)

Diagram

Typical Application Circuit

Evaluation Kits

MAX5946LEVCMODU, MAX5946LEVKIT

Reliability Reports

Show FIT data for:

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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 Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX5946AETX

Active TQFN;36 pin;37 mm²
Outline Drawing: 21-0141 (PDF)
Land Pattern: 90-0050 (PDF)
Use pkgcode/variation: T3666-3*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis

MAX5946AETX-T

Active

Land Pattern: Not Available

-40°C to +85°C See data sheet

MAX5946AETX+

Active TQFN;36 pin;37 mm²
Outline Drawing: 21-0141 (PDF)
Land Pattern: 90-0050 (PDF)
Use pkgcode/variation: T3666+3*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX5946AETX+T

Active

Land Pattern: Not Available

-40°C to +85°C See data sheet

MAX5946L Free
Sample Buy Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX5946LETX

Active TQFN;36 pin;37 mm²
Outline Drawing: 21-0141 (PDF)
Land Pattern: 90-0050 (PDF)
Use pkgcode/variation: T3666-3*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis

MAX5946LETX-T

Active

Land Pattern: Not Available

-40°C to +85°C See data sheet

MAX5946LETX+

Active TQFN;36 pin;37 mm²
Outline Drawing: 21-0141 (PDF)
Land Pattern: 90-0050 (PDF)
Use pkgcode/variation: T3666+3*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX5946LETX+T

Active

Land Pattern: Not Available

-40°C to +85°C See data sheet

More Information

New Product Press Release 2004-11-23

Related Products

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

More Like This: View Product Families for Similar Products

See All Hot Swap Controllers (47 Products)

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Document Ref.: 19-3483; Rev 0; 2004-11-22
This page last modified: 2009-10-06