MAX5946

更新时间： 2024-11-22 22:55:19

品牌	Logo	应用领域
美信 - MAXIM		控制器 PC
页数	文件大小	规格书
23页	1016K
描述
Dual PCI Express, Hot-Plug Controller

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MAX5946 数据手册

19-3483; Rev 0; 11/04

Dual PCI Express, Hot-Plug

Controller

General Description

Features

♦ PCI Express Compliant

The MAX5946 dual 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

two PCI express slots. The MAX5946’s logic inputs/out-

puts allow interfacing directly with the system hot-plug

management controller or through an SMBus™ with an

external I/O expander. An integrated debounced atten-

tion switch and present-detect signals are included to

simplify system design.

♦ 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

The MAX5946 drives four external n-channel MOSFETs

to control the 12V and 3.3V main outputs. The 3.3V aux-

iliary outputs are controlled through internal 0.3Ω

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.

♦ 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

At power-up, the MAX5946 keeps all of the external

MOSFETs off until the supplies rise above their respec-

tive 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 automatical-

ly restarts after a restart time delay. The device is avail-

able in a 36-pin (6mm × 6mm) thin QFN package and

operates over the -40°C to +85°C temperature range.

♦ Allows Control through SMBus with an I/O

Expander

Ordering Information

PART

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

36 Thin QFN

MAX5946AETX

MAX5946LETX

Pin Configuration

TOP VIEW

30 29 28

36 35 34 33 32 31

Applications

PRES-DETA

FONA

PRES-DETB

FONB

Servers

ONA

ONB

Desktop Mobile Server Platforms

Workstations

AUXONA

12SA+

12SA-

AUXONB

12SB+

MAX5946

22 12SB-

Embedded Devices

12GA

12GB

3.3SA+

3.3SA-

3.3SB+

3.3SB-

13 14 15 16 17 18

10 11 12

Typical Application Circuit appears at end of data sheet.

SMBus is a trademark of Intel Corp.

PCI Express is a trademark of PCI-SIG Corp.

THIN QFN

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...23

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与MAX5946相关器件

型号	品牌	获取价格	描述	数据表
MAX5946AETX	MAXIM	获取价格	Dual PCI Express, Hot-Plug Controller
MAX5946AETX+	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 2 Channel, BICMOS, 6 X 6 MM, 0.90 MM HEIGHT, MO-
MAX5946AETX+T	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 2 Channel, BICMOS, 6 X 6 MM, 0.90 MM HEIGHT, MO-
MAX5946AETX-T	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 2 Channel, BICMOS, 6 X 6 MM, 0.90 MM HEIGHT, MO-
MAX5946LETX	MAXIM	获取价格	Dual PCI Express, Hot-Plug Controller
MAX5946LETX+	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 2 Channel, BICMOS, 6 X 6 MM, 0.90 MM HEIGHT, MO-
MAX5946LETX+T	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 2 Channel, BICMOS, 6 X 6 MM, 0.90 MM HEIGHT, MO-
MAX5947	ADI	获取价格	正电源、高压、热插拔控制器
MAX5947A	MAXIM	获取价格	Positive High-Voltage, Hot-Swap Controllers
MAX5947AESA	MAXIM	获取价格	Positive High-Voltage, Hot-Swap Controllers

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