MAX6643LBFAEE+【PDF 1/17 页】IC CTLR PWM FAN-SPEED 16QSOP

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General Description

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.

The MAX6643/MAX6644/MAX6645 generate a PWM

waveform that drives an external power transistor, which

in turn modulates the fans power supply. The

MAX6643/MAX6644/MAX6645 monitor temperature and

adjust the duty cycle of the PWM output waveform to con-

trol the fans speed according to the cooling needs of the

system. The MAX6643 monitors its own die temperature

and an optional external transistors temperature, while the

MAX6644 and MAX6645 each monitor the temperatures

of one or two external diode-connected transistors.

The MAX6643 and MAX6644 have nine selectable trip

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

tory programmed and is not pin selectable.

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 devices functions.

The MAX6643 and MAX6644 are available in a small

16-pin QSOP package and the MAX6645 is available in

a 10-pin 礛AX

?/DIV>

package. All versions operate from

3.0V to 5.5V supply voltages and consume 500礎 (typ)

supply current.

Applications

Networking Equipment

Storage Equipment

Servers

Desktop Computers

Workstations

Features

f Simple, Automatic Fan-Speed Control

f Internal and External Temperature Sensing

f Detect Fan Failure Through Locked-Rotor Output,

Tachometer Output, or Fan-Supply Current

Sensing

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

Audibility of Fan-Speed Changes

f Pin-Selectable or Factory-Selectable Low-

Temperature Fan Threshold

f Pin-Selectable or Factory-Selectable High-

Temperature Fan Threshold

f Spin-Up Time Ensures Fan Start

f Fan-Start Delay Minimizes Power-Supply Load at

Power-Up

f 32Hz PWM Output

f Controlled Duty-Cycle Rate-of-Change Ensures

Good Acoustic Performance

f 2?SPAN class="pst MAX6643LBFAEE-_2292765_4">C Temperature-Measurement Accuracy

f FULLSPD/FULLSPD Input Sets PWM to 100%

f Pin-Selectable OT Output Threshold

f 16-Pin QSOP and 10-Pin ?/SPAN>MAX Packages

Automatic PWM Fan-Speed Controllers with

Overtemperature Output

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3305; Rev 2; 3/07

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

or visit Maxims website at www.maxim-ic.com.

Pin Configurations, Typical Operating Circuit, and Selector

Guide appear at end of data sheet.

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX6643LBFAEE

-40癈 to +125癈 16 QSOP

E16-1

MAX6643LBBAEE

-40癈 to +125癈 16 QSOP

E16-1

MAX6644LBAAEE

-40癈 to +125癈 16 QSOP

E16-1

MAX6645ABFAUB -40?/SPAN>C to +125?/SPAN>C 10 ?/SPAN>MAX

U10-2

礛AX is a registered trademark of Maxim Integrated Products, Inc.

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