Rainbow-electronics MAX6665 Bedienungsanleitung PDF herunterladen (Seite 1)

General Description

The MAX6665 is a fully integrated thermal switch with

an internal power transistor for driving a cooling fan

rated up to 24V and 250mA. When the MAX6665’s tem-

perature rises above a factory-programmed threshold,

the FANOUT pin becomes active and powers the fan.

The MAX6665 is available with factory-programmed fan

activation threshold temperatures from +40°C to +70°C

in 5°C increments. Accuracy of the fan activation trip

point is ±1°C (typ) and ±3°C (max). The trip point’s hys-

teresis is pin selectable to 1°C, 4°C, or 8°C. Two open-

drain logic outputs indicate overtemperature con-

ditions: WARN is activated when the temperature is

15°C above the fan activation threshold, and OT is acti-

vated when the temperature is 30°C above the thresh-

old. These features can be used to safely power down

systems that are overheated.

The MAX6665 operates from a +2.7V to +5.5V power

supply, and the associated fan can be powered from

4.5V to 24V. It is available in an 8-pin SO package and

operates from -40°C to +125°C.

Applications

Notebook and Desktop Computers

Servers

PC Power Supplies

Laboratory Instruments

Card Racks

Features

♦ On-Chip 250mA Fan Switch

♦ No External Components Required

♦ Factory-Programmed Thresholds

♦ Two Overtemperature Warning Signals

♦ Pin-Selectable 1°C, 4°C, and 8°C Hysteresis

♦ Low 65µA Supply Current

MAX6665

Fan Controller/Driver with Factory-

Programmed Temperature Thresholds

________________________________________________________________ Maxim Integrated Products 1

FANON

7 V

HYST

GND

TOP VIEW

MAX6665

FORCEON

FANOUT

WARN

Pin Configuration

FANON

GND

HYST

+3.3V

+4.5V TO +24V

100mA TO 250mA

COOLING FAN

100kΩ

1µF

MAX6665

FORCEON

FANOUT

WARN

100kΩ

Typical Operating Circuit

19-2056; Rev 0; 5/01

Ordering Information

PART

TEMP.

RANGE

PIN-

PACKAGE

THRESHOLD

MAX6665ASA40

-40°C to

+125°C

8 SO-EP* 40°C

MAX6665ASA45

-40°C to

+125°C

8 SO-EP* 45°C

MAX6665ASA50

-40°C to

+125°C

8 SO-EP* 50°C

MAX6665ASA55

-40°C to

+125°C

8 SO-EP* 55°C

MAX6665ASA60

-40°C to

+125°C

8 SO-EP* 60°C

MAX6665ASA65

-40°C to

+125°C

8 SO-EP* 65°C

MAX6665ASA70

-40°C to

+125°C

8 SO-EP* 70°C

*Exposed paddle

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.

1 2 3 4 5 6

Inhaltsverzeichnis

Seite 1 - *Exposed paddle

General DescriptionThe MAX6665 is a fully integrated thermal switch withan internal power transistor for driving a cooling fanrated up to 24V and 250m

Seite 2 - ELECTRICAL CHARACTERISTICS

MAX6665Fan Controller/Driver with Factory-Programmed Temperature Thresholds2 _________________________________________________________________________

Seite 3 - MAX6665 toc04

MAX6665Fan Controller/Driver with Factory-Programmed Temperature Thresholds___________________________________________________________________________

Seite 4

MAX6665Fan Controller/Driver with Factory-Programmed Temperature Thresholds4 _________________________________________________________________________

Seite 5 - Layout Issues

increases by a maximum of:51°C/W x 0.03125W = 1.59°CTherefore, the effective hysteresis is about 1.59°C high-er than the hysteresis selected by the HY

Seite 6 - Chip Information

MAX6665Fan Controller/Driver with Factory-Programmed Temperature ThresholdsMaxim cannot assume responsibility for use of any circuitry other than circ

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Rainbow-electronics MAX6665 Bedienungsanleitung Seite 1

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