MAX5944

更新时间： 2024-11-19 11:16:23

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
15页	809K
描述
Dual FireWire Current Limiter and Low-Drop ORing

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MAX5944 数据手册

19-3426; Rev 0; 10/04

Dual FireWire Current Limiter and Low-Drop

ORing Switch Controller

General Description

Features

The MAX5944 is a dual, current limiter/low-drop ORing,

switch controller power-management IC for FireWire^®

applications. Each independent channel controls two

external power MOSFETs to regulate current from the

input power supply to the load and performs low-voltage-

drop power-supply ORing. The MAX5944 operates over

the 7.5V to 37V input range and provides inrush and out-

put current limit in addition to diode ORing functions suit-

able for FireWire applications.

♦ Provides Safe Hot-Swap for 7.5V to 37V Power

Supplies

♦ Dual-Channel Hot-Swap

♦ Low-Drop Power ORing with Ultra-Fast Turn-Off

♦ Active Current Limit

♦ ±5% Current-Limit Sensing Accuracy

♦ 2ms Current-Limit Timeout

The MAX5944 allows the safe insertion and removal of

FireWire peripherals into a live FireWire port by providing

inrush current control and output current-limiting func-

tions. The MAX5944 features a current-limit function that

actively limits the current drawn by the load with a 2ms

timeout. Its autoretry function then automatically restarts

after the 259ms autoretry delay time.

♦ Fast Current-Limit Response to Output

Short-Circuit Conditions

♦ Drives External n-Channel Power MOSFETs

♦ Independent Overcurrent Fault Status Outputs

♦ 259ms Autoretry Period

The ORing feature provides a very efficient way to pro-

tect the FireWire port when connected to another

FireWire peripheral that sources a higher voltage. By

turning off the external MOSFETS, the MAX5944 provides

a true bidirectional load disconnect. Each channel has

an independent ON/OFF control that results in less than

10µA supply current per channel.

♦ 10µA (Per Channel) Shutdown Current

♦ Independent ON/OFF Control Allows

Undervoltage Lockout Programming

♦ Fast Load Disconnect Control Through

ON/OFF Inputs

The MAX5944 operates over the -40°C to +85°C

extended temperature range and is available in a

16-pin SO package.

♦ Bidirectional Load Disconnect

♦ Power Routing from One Port to Another

Applications

Ordering Information

FireWire Desktop/Notebook Port

FireWire Peripheral Device Current Limit

FireWire Hub

PART

TEMP RANGE

PIN-PACKAGE

MAX5944ESE

-40°C to +85°C

16 SO

Pin Configuration

Hot Swap

TOP VIEW

INA

16 SENSEA

15 GATE1A

14 GATE2A

ONA

FAULTA

ONQ1

MAX5944

13 OUTA

12 GND

OUTB

GATE2B

GATE1B

SENSEB

11 FAULTB

10 ONB

INB

Typical Operating Circuit appears at end of data sheet.

FireWire is a registered trademark of Apple Computer, Inc.

________________________________________________________________ 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...15

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与MAX5944相关器件

型号	品牌	获取价格	描述	数据表
MAX5944ESE	MAXIM	获取价格	Dual FireWire Current Limiter and Low-Drop ORing
MAX5944ESE+	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 2 Channel, BICMOS, PDSO16, SO-16
MAX5944ESE+T	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 2 Channel, BICMOS, PDSO16, SO-16
MAX5944ESE-T	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 2 Channel, BICMOS, PDSO16, SO-16
MAX5945	MAXIM	获取价格	Quad Network Power Controller for Power-Over-LAN
MAX5945CAX	MAXIM	获取价格	Quad Network Power Controller for Power-Over-LAN
MAX5945CAX-T	MAXIM	获取价格	Power Supply Management Circuit, Adjustable, 4 Channel, BICMOS, PDSO36, 0.80 MM PICTH, SSO
MAX5945EAX	MAXIM	获取价格	Quad Network Power Controller for Power-Over-LAN
MAX5945EAX-T	MAXIM	获取价格	Power Supply Management Circuit, Adjustable, 4 Channel, BICMOS, PDSO36, 0.80 MM PICTH, SSO
MAX5946	MAXIM	获取价格	Dual PCI Express, Hot-Plug Controller

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