MAX6643

更新时间： 2024-11-06 11:15:19

品牌	Logo	应用领域
美信 - MAXIM		风扇控制器
页数	文件大小	规格书
17页	209K
描述
Automatic PWM Fan-Speed Controllers with Overtemperature Output

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MAX6643 数据手册

19-3305; Rev 2; 3/07

Automatic PWM Fan-Speed Controllers with

Overtemperature Output

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 con-

trol 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

The MAX6643 and MAX6644 have nine selectable trip

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

tory programmed and is not pin selectable.

♦ Spin-Up Time Ensures Fan Start

♦ Fan-Start Delay Minimizes Power-Supply Load at

Power-Up

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.

♦ 32Hz PWM Output

♦ Controlled Duty-Cycle Rate-of-Change Ensures

Good Acoustic Performance

♦ 2°C Temperature-Measurement Accuracy

♦ FULLSPD/FULLSPD Input Sets PWM to 100%

♦ Pin-Selectable OT Output Threshold

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

supply current.

♦ 16-Pin QSOP and 10-Pin µMAX Packages

Ordering Information

Applications

Networking Equipment

Storage Equipment

Servers

PIN-

PKG

PART

TEMP RANGE

PACKAGE CODE

MAX6643LBFAEE

MAX6643LBBAEE

MAX6644LBAAEE

-40°C to +125°C 16 QSOP

E16-1

U10-2

Desktop Computers

Workstations

MAX6645ABFAUB -40°C to +125°C 10 µMAX

Pin Configurations, Typical Operating Circuit, and Selector

Guide appear at end of data sheet.

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

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...17

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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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