MAX6670 Maxim Integrated Products, MAX6670 Datasheet

MAX6670

Manufacturer Part Number

MAX6670

Description

(MAX6668 / MAX6670) Remote Temperature Switches

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX6670.pdf (8 pages)

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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.

19-2133; Rev 2; 11/02

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.

Remote Temperature Switches with Integrated

Notebook and Desktop Computers

Network Switches

PC Power Supplies

Laboratory Instruments

Card Racks

Temperature Alarms

Fan Controls

________________________________________________________________ Maxim Integrated Products

General Description

Applications

o +12V, 250mA Integrated Fan Driver

o No Calibration Required

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

o Factory-Programmed Temperature Thresholds

o Overtemperature Warning Signals

o 110µA (typ) Supply Current

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

Ordering Information continued at end of data sheet.

MAX6668AUA40 -40°C to +125°C

MAX6668AUA45 -40°C to +125°C

MAX6668AUA50 -40°C to +125°C

MAX6668AUA60 -40°C to +125°C

MAX6668AUA70 -40°C to +125°C

MAX6668AUA75 -40°C to +125°C

(MAX6670)

from +40°C to +75°C

2N3904

Fan Controller/Driver

PART

2200pF

Typical Application Circuit

HYST

DXP

DXN

GND

RANGE

Ordering Information

TEMP

MAX6670

PGND

+3.3V

FORCEON

FANOUT

WARN

PA C K A G E

8 µMAX

PI N -

250mA

FAN

10k

Features

T H R ESH -

+12V

O L D

( ° C )

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