Datasheet > MAX6643

MAX6643

更新时间： 2024-11-07 14:57:19

品牌	Logo	应用领域
亚德诺 - ADI		控制器风扇
页数	文件大小	规格书
18页	833K
描述
自动PWM风扇速度控制器，带有过温报警输出

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中文翻译

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MAX6643 数据手册

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Automatic PWM Fan-Speed Controllers

with Overtemperature Output

MAX6643/MAX6644/

MAX6645

General Description

Features

● Simple, Automatic Fan-Speed Control

The MAX6643/MAX6644/MAX6645 monitor temperature

and automatically adjust fan speed to ensure optimum

cooling while minimizing acoustic noise from the fan.

Each device measures two temperature locations.

● Internal and External Temperature Sensing

● Detect Fan Failure Through Locked-Rotor Output,

Tachometer Output, or Fan-Supply Current Sensing

The MAX6643/MAX6644/MAX6645 generate a PWM

waveform that drives an external power transistor, which

in turn modulates the fan’s power supply. The MAX6643/

MAX6644/MAX6645 monitor temperature and adjust the

duty cycle of the PWM output waveform to control the

fan’s speed according to the cooling needs of the system.

The MAX6643 monitors its own die temperature and

an optional external transistor’s temperature, while the

MAX6644 and MAX6645 each monitor the temperatures

of one or two external diode-connected transistors.

● Multiple, 1.6% Output Duty-Cycle Steps for Low

Audibility of Fan-Speed Changes

● Pin-Selectable or Factory-Selectable

Low-Temperature Fan Threshold

● Pin-Selectable or Factory-Selectable

High-Temperature Fan Threshold

● Spin-Up Time Ensures Fan Start

● Fan-Start Delay Minimizes Power-Supply Load

at Power-Up

The MAX6643 and MAX6644 have nine selectable trip

temperatures (in 5°C increments). The MAX6645 is

factory programmed and is not pin selectable.

● 32Hz PWM Output

● Controlled Duty-Cycle Rate-of-Change Ensures

Good Acoustic Performance

All versions include an overtemperature output (OT).

OT can be used for warning or system shutdown. The

MAX6643 also features a FULLSPD input that forces

the PWM duty cycle to 100%. The MAX6643/MAX6644/

MAX6645 also feature a FANFAIL output that indicates a

failed fan. See the Selector Guide for a complete list of

each device’s functions.

● 2°C Temperature-Measurement Accuracy

● FULLSPD Input Sets PWM to 100%

● Pin-Selectable OT Output Threshold

● 16-Pin QSOP and 10-Pin μMAX Packages

The MAX6643 and MAX6644 are available in a small

16-pin QSOP package and the MAX6645 is available in

a 10-pin μMAX package. All versions operate from 3.0V

Ordering Information

PIN-

PKG

PART

TEMP RANGE

PACKAGE CODE

to 5.5V supply voltages and consume 500μA (typ) supply

current.

MAX6643LBFAEE -40°C to +125°C 16 QSOP

MAX6643LBBAEE -40°C to +125°C 16 QSOP

MAX6644LBAAEE -40°C to +125°C 16 QSOP

MAX6645ABFAUB -40°C to +125°C 10 µMAX

E16-1

U10-2

Applications

● Networking Equipment

● Storage Equipment

● Servers

● Desktop Computers

● Workstations

Pin Configurations, Typical Operating Circuit, and Selector

Guide appear at end of data sheet.

μMAX is a registered trademark of Maxim Integrated Products, Inc.

19-3305; Rev 3; 6/19

One Analog Way, Wilmington, MA 01887 U.S.A.

Tel: 781.329.4700

12 3 4 5 6 7...18

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与MAX6643相关器件

型号	品牌	获取价格	描述	数据表
MAX6643HAFAEE	MAXIM	获取价格	Analog Circuit, 1 Func, BICMOS, PDSO16, 0.150 INCH, 0.025 INCH PITCH, MO-137AB, QSOP-16
MAX6643HAFAEE+	MAXIM	获取价格	Analog Circuit, 1 Func, BICMOS, PDSO16, 0.150 INCH, 0.025 INCH PITCH, MO-137AB, QSOP-16
MAX6643LABAEE	MAXIM	获取价格	Analog Circuit, 1 Func, BICMOS, PDSO16, 0.150 INCH, 0.025 INCH PITCH, MO-137AB, QSOP-16
MAX6643LAFAEE	MAXIM	获取价格	Analog Circuit, 1 Func, BICMOS, PDSO16, 0.150 INCH, 0.025 INCH PITCH, MO-137AB, QSOP-16
MAX6643LBBAEE	MAXIM	获取价格	Automatic PWM Fan-Speed Controllers with Overtemperature Output
MAX6643LBBAEE+	MAXIM	获取价格	Analog Circuit, 1 Func, BICMOS, PDSO16, 0.150 INCH, 0.025 INCH PITCH, MO-137AB, QSOP-16
MAX6643LBBAEE+T	MAXIM	获取价格	Analog Circuit, 1 Func, BICMOS, PDSO16, 0.150 INCH, 0.635 MM PITCH, MO-137AB, QSOP-16
MAX6643LBBAEE-T	MAXIM	获取价格	Analog Circuit, 1 Func, BICMOS, PDSO16, 0.150 INCH, 0.025 INCH PITCH, MO-137AB, QSOP-16
MAX6643LBFAEE	MAXIM	获取价格	Automatic PWM Fan-Speed Controllers with Overtemperature Output
MAX6643LBFAEE+	MAXIM	获取价格	Motion Control Electronic, BICMOS, PDSO16,

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