Rainbow-electronics MAX6670 Bedienungsanleitung PDF herunterladen

General Description

The MAX6668/MAX6670 remote-junction thermal

switches with an internal power transistor drive a cool-

ing fan rated for supply voltages up to +12V and

250mA. These devices measure the temperature of an

external P-N junction (typically a diode-connected tran-

sistor) and turn on the fan power switch when the

remote temperature rises above a factory-programmed

threshold. Self-contained and requiring no software

development, the MAX6668/MAX6670 are simple

“drop-in” fan-control solutions for a variety of systems.

The MAX6670 features an open-drain WARN output

that goes active when the remote temperature exceeds

the factory-programmed fan activation threshold by

+15°C. The MAX6670 features an open-drain OT output

that goes active when the remote temperature exceeds

the factory-programmed threshold by +30°C. The

MAX6668/MAX6670 provide a fan-control input,

FORCEON, that allows the fan to be driven externally,

regardless of temperature.

Available temperature thresholds range from +40°C to

+75°C in 5°C increments. Hysteresis is preset to 8°C on

the MAX6668 or pin selectable to 4°C, 8°C, or 12°C

using a three-level logic input on the MAX6670.

Temperature threshold accuracy is ±1°C (typ) and

±2.2°C (max) for remote-junction temperatures from

+40°C to +75°C.

The MAX6668/MAX6670 operate from a +3V to +3.6V

power supply, and are specified over the automotive

temperature range (-40°C to +125°C). The MAX6668 is

offered in an 8-pin µMAX package and the MAX6670 is

available in a space-saving 10-pin µMAX package.

Applications

Notebook and Desktop Computers

Network Switches

PC Power Supplies

Laboratory Instruments

Card Racks

Temperature Alarms

Fan Controls

Features

♦ +12V, 250mA Integrated Fan Driver

♦ No Calibration Required

♦ Pin-Selectable 4°C, 8°C, or 12°C Hysteresis

(MAX6670)

♦ Factory-Programmed Temperature Thresholds

from +40°C to +75°C

♦ Overtemperature Warning Signals

♦ 110µA (typ) Supply Current

♦ Space-Saving 8-Pin and 10-Pin µMAX Packages

MAX6668/MAX6670

Remote Temperature Switches with Integrated

Fan Controller/Driver

________________________________________________________________ Maxim Integrated Products 1

DXP

GND

PGND

HYST

MAX6670

FORCEON

FANOUT

WARN

DXN

2200pF

2N3904

10kΩ

250mA

FAN

+3.3V

+12V

Typical Applications Circuit

Ordering Information

19-2133; Rev 0; 8/01

Pin Configuration appears at end of data sheet.

Typical Operating Circuit appears at end of data sheet.

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.

*These parts are offered in eight standard temperature ver-

sions from +40°C through +75°C in 5°C increments. To com-

plete the suffix information, select an available temperature trip

point in degrees centigrade and fill in the blank. For example,

the MAX6670AUB065 describes a MAX6670 in a 10-pin µMAX

package with +65°C trip point.

PART* TEMP. RANGE PIN-PACKAGE

MAX6668AUA_ _ _ -40°C to +125°C 8 µMAX

MAX6670AUB_ _ _ -40°C to +125°C 10 µMAX

1 2 3 4 5 6 7 8

Inhaltsverzeichnis

Seite 1 - Fan Controller/Driver

General DescriptionThe MAX6668/MAX6670 remote-junction thermalswitches with an internal power transistor drive a cool-ing fan rated for supply voltage

Seite 2

MAX6668/MAX6670Remote Temperature Switches with IntegratedFan Controller/Driver2 _____________________________________________________________________

Seite 3

MAX6668/MAX6670Remote Temperature Switches with IntegratedFan Controller/Driver_______________________________________________________________________

Seite 4

MAX6668/MAX6670Detailed DescriptionThe MAX6668/MAX6670 are simple fan controllers/dri-vers that turn on an internal power transistor when thesensed te

Seite 5

Hysteresis InputThe temperature comparator has hysteresis to preventsmall temperature changes near the threshold temper-ature from causing the fan to

Seite 6

MAX6668/MAX6670other traces carrying high-frequency noise signalsdoes not help reduce EMI.The MAX6668/MAX6670s’ PGND is the ground returnfor the fan d

Seite 7

MAX6668/MAX6670Remote Temperature Switches with IntegratedFan Controller/Driver_______________________________________________________________________

Seite 8

MAX6668/MAX6670Remote Temperature Switches with IntegratedFan Controller/DriverMaxim cannot assume responsibility for use of any circuitry other than

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Rainbow-electronics MAX6670 Bedienungsanleitung

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Inhaltsverzeichnis

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