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产品型号MAX6665ASA40的Datasheet PDF文件预览

19-2056; Rev 0; 5/01

Fan Controller/Driver with Factory-

Programmed Temperature Thresholds

General Description

Features

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.

ꢀ 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

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 ±±°C ꢀtypꢁ and ±ꢂ°C ꢀmaꢃꢁ. The trip point’s hys-

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

drain logic outputs indicate overtemperature con-

ditions: WARN is activated when the temperature is

±5°C above the fan activation threshold, and OT is acti-

vated when the temperature is ꢂ0°C above the thresh-

old. These features can be used to safely power down

systems that are overheated.

Ordering Information

TEMP.

RANGE

PIN-

PACKAGE

PART

THRESHOLD

40°C

-40°C to

+125°C

MAX6665ASA40

MAX6665ASA45

MAX6665ASA50

MAX6665ASA55

MAX6665ASA60

MAX6665ASA65

8 SO-EP*

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 +±25°C.

-40°C to

+125°C

45°C

-40°C to

+125°C

50°C

Applications

Notebook and Desktop Computers

-40°C to

+125°C

55°C

Servers

-40°C to

+125°C

PC Power Supplies

Laboratory Instruments

Card Racks

60°C

-40°C to

+125°C

65°C

-40°C to

+125°C

MAX6665ASA70

70°C

Typical Operating Circuit

*Exposed paddle

+4.5V TO +24V

100mA TO 250mA

COOLING FAN

Pin Configuration

TOP VIEW

FANOUT

WARN

+3.3V

1µF

MAX6665

100kΩ

GND

FANOUT

HYST

FORCEON

HYST

MAX6665

100kΩ

WARN

FORCEON

FANON

GND

________________________________________________________________ Maxim Integrated Products

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.

Fan Controller/Driver with Factory-

Programmed Temperature Thresholds

ABSOLUTE MAXIMUM RATINGS

to GND..............................................................-0.3V to +6V

Continuous Power Dissipation (T = +70°C)

FANOUT to GND ....................................................-0.3V to +28V

FORCEON, HYST, FANON to GND............-0.3V to (V + 0.3V)

WARN, OT to GND ...................................................-0.3V to +6V

FANOUT Continuous Current............................................400mA

All Other Pins.................................................................... 20mA

8-Pin SO (derate 19.6mW/°C above +70°C).............1568mW

Operating Temperature Range .........................-40°C to +125°C

Junction (storage) Temperature Range ............-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

= +2.7V to +5.5V, T = -40°C to +125°C. Typical values are at V

= +3.3V and T = +25°C, unless otherwise noted.) (Note 1)

DD A

PARAMETER

CONDITIONS

MIN

TYP

MAX

5.5

UNITS

Supply Voltage

2.7

µA

Supply Current

No load

200

FANOUT Drive Voltage

FANOUT pin

< 0.8V

250

FANOUT

FAN OUT Output Current Capability

FANOUT Leakage Current

< 0.6V, T ≤ T +10°C, V ≥ +3.3V

= 26V, T = +60°C

µA

MAX6665ASA40

MAX6665ASA45

MAX6665ASA50

MAX6665ASA55

MAX6665ASA60

MAX6665ASA65

MAX6665ASA70

FANOUT Threshold, T

°C

FANOUT Threshold Error

FANOUT Hysteresis

-3

°C

HYST is unconnected

HYST ≤ 0.3V

HYST ≥ 0.7V

WARN Threshold

Relative to FANOUT temperature threshold

+15

+30

°C

OT Threshold

WARN and OT Hysteresis

FANON Output High Voltage

FANON Output Low Voltage

= 0.5mA source

= 0.5mA sink

2.0

FANON

WARN

0.7

0.3

= 1.2mA or I

= 1.2mA sink

= 20mA sink

= 5.5V

W ARN and O T Output Voltage Low

= 20mA or I

= 5.5V or V

0.5

0.1

Open-Drain Leakage Current

Input Low Voltage

µA

WARN

FORCEON and HYST pins

0.3V

Input High Voltage

0.7V

-1

FORCEON connected to V or GND

+15

Input Current

µA

HYST connected to V

or GND

-15

Note 1: Specifications over temperature are guaranteed by design. Parts are 100% production tested at 10°C below the tempera-

ture threshold.

_______________________________________________________________________________________

Fan Controller/Driver with Factory-

Programmed Temperature Thresholds

Typical Operating Characteristics

(V = +3.3V, unless otherwise noted.)

FANOUT VOLTAGE vs. CURRENT

FANOUT VOLTAGE vs. SUPPLY VOLTAGE

900

800

700

600

500

400

550

500

450

400

350

300

250

= +75°C

FANOUT CURRENT = 250mA

= +2.7V

= +75°C

= +3.3V

= +50°C

300

200

100

= +5.0V

100

FANOUT CURRENT (mA)

1000

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

SUPPLY VOLTAGE (V)

NO-LOAD SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE THRESHOLD

DISTRIBUTION

MAX6665ASA55

100 SAMPLES

FORCEON = V

= +5V

= +3.3V

= +2.7V

-40 -20

20 40 60 80 100 120

TEMPERATURE (°C)

-3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.5 1.0 1.5 2.0 2.5 3.0

TEMPERATURE ERROR (°C)

_______________________________________________________________________________________

Fan Controller/Driver with Factory-

Programmed Temperature Thresholds

Pin Description

NAME

FUNCTION

GND

Ground

Force Fan On Input. Set FORCEON low to force the fan switch on. Set FORCEON high for normal

operation.

FORCEON

HYST

Three-State Hysteresis Input. Connect HYST to V

for 8°C, GND for 4°C, and leave HYST

unconnected for 1°C hysteresis.

Fan-On Indicator Output. Push-pull output. FANON is high when the fan switch is on. FANON is low

when the fan switch is off.

FANON

Overtemperature Output. Active-low when the temperature is 30°C above the fan threshold. Open-

drain output, requires resistive pullup.

Overtemperature Warning Output. Active-low when the temperature is 15°C above the fan

threshold. Open-drain output, requires resistive pullup.

WARN

Supply Voltage. Bypass with a 1µF capacitor to GND as close to V pin as possible.

FANOUT

Fan-Switch (Driver) Output. Connect to the low side of a fan.

Ground

Exposed

Paddle

GND

Detailed Description

Applications Information

The MAX6665 is a simple fan controller/driver that turns

on the internal power transistor when its die tempera-

ture exceeds a factory-set threshold. By connecting a

small (typically 5V to 12V, 100mA to 250mA) cooling

fan to FANOUT, a simple on/off fan-control system is

created. FANOUT drives the fan’s low side. The fan’s

positive supply pin should be connected to its normal

power-supply voltage (up to 24V nominal).

Thermal Considerations and Hysteresis

The temperature comparator has hysteresis to prevent

small temperature changes near the threshold temper-

ature from causing the fan to turn on and off repeatedly

over short periods of time. The FANOUT pin goes

active and powers the fan when the MAX6665’s die

temperature exceeds the factory-programmed trip tem-

perature. As the cooling fan operates, the circuit board

temperature should decrease, which in turn causes the

MAX6665’s die temperature to decrease. When the die

temperature is equal to the trip threshold minus the

hysteresis, the FANOUT pin turns the fan off, removing

power from the fan. The HYST pin sets the amount of

hysteresis to 1°C, 4°C, or 8°C by letting the pin float or

To turn the fan on when the MAX6665’s die temperature

is less than the threshold voltage, drive FORCEON low.

This overrides the internal control circuitry and allows

an external device to activate the fan. FANON is an

active-high push-pull logic output that goes high when

the fan is turned on, either when temperature exceeds

the threshold or the fan is forced on.

connecting to GND or V , respectively. This allows

the amount of hysteresis to be matched to the cooling

and noise requirements of the system.

WARN is an active-low, open-drain digital output that

indicates the MAX6665’s die temperature exceeds

15°C above the fan trip threshold. WARN output serves

as a warning that the system temperature has contin-

ued to rise well above the fan activation temperature.

OT is an active-low open-drain digital output that indi-

cates the MAX6665’s die temperature exceeds 30°C

above the fan trip threshold. It serves as a thermal shut-

down output to the system in case of excessive temper-

ature rise. Figure 1 shows a typical application circuit

for a high-reliability, fail-safe temperature monitor.

Hysteresis is also affected by self-heating of the

MAX6665’s die. The fan current flowing through the on-

chip power transistor causes the die temperature to

increase. For example, assume the MAX6665 controls

a 125mA fan. When the fan is operating, the voltage

drop across the output transistor is typically under

250mV. At 250mV, the power dissipation is 31.25mW.

The thermal resistance of the MAX6665 package (with

EP soldered) is 51°C/W, so the die temperature

_______________________________________________________________________________________

Fan Controller/Driver with Factory-

Programmed Temperature Thresholds

+4.5V TO +24V

100mA TO 250mA

COOLING FAN

FANOUT

WARN

FANON

+3.3V

1µF

MAX6665

100kΩ

µP

HYST

I/O

FORCEON

100kΩ

SYSTEM POWER

SHUTDOWN

GND

Figure 1. High-Reliability, Fail-Safe Fan Controller and Temperature Monitor

increases by a maximum of:

Locating the MAX6665

The location of the MAX6665 in the system affects its

operation. Because the fan is turned on and off based

on the MAX6665’s die temperature, place the MAX6665

close to major heat-generating components in the sys-

tem—a high-speed CPU or a power device, for exam-

ple. A higher supply voltage reduces the FANOUT

voltage, which reduces the self-heating effects.

51°C/W x 0.03125W = 1.59°C

Therefore, the effective hysteresis is about 1.59°C high-

er than the hysteresis selected by the HYST pin. For

example, setting the HYST pin for 8°C of hysteresis

results in an effective hysteresis of about 9.6°C.

A larger fan with a power-supply current of 250mA

causes a maximum voltage drop of 0.6V at the output

pin. This results in 150mW power dissipation and the

die temperature increases by:

The die temperature of the MAX6665 tracks the tempera-

ture of its leads and the EP. If it is soldered to a PC board,

it quickly reaches the temperature of the traces in that

section of the circuit board. Air temperature affects the die

temperature. Since the plastic package does not conduct

heat as well as the leads, the effect of air temperature is

much less than that of lead temperature.

51°C/W x 0.150W = 7.65°C

If the HYST pin has been set for 8°C of hysteresis, the

total effective hysteresis will be about 15.7°C.

Using fans with somewhat higher operating current

than 250mA results in higher voltage across the output

transistor. The increased power dissipation caused by

the higher current and voltage levels will increase self-

heating, thereby increasing the effective hysteresis.

When using higher-power fans, be sure that the

MAX6665’s power dissipation does not cause so much

self-heating that the MAX6665 stays on constantly.

Layout Issues

The MAX6665’s GND pin is ground return for the fan dri-

ver and the device. Large fan current induces noise

(ground bounce) to the MAX6665. Bypass V

to GND

with a 1µF tantalum capacitor located as close to the

MAX6665 as possible. For long V and GND lines, an

additional bypass capacitor may be needed. The bypass

capacitor reduces GND noise. The EP is internally con-

nected to the GND pin. Solder the EP to the ground plane

for better electrical and thermal performance.

_______________________________________________________________________________________

Fan Controller/Driver with Factory-

Programmed Temperature Thresholds

Chip Information

TRANSISTOR COUNT: 1543 MOS

119 BIPOLAR

PROCESS: BiCMOS

Package Information

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

Printed USA

is a registered trademark of Maxim Integrated Products.

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MAX6665ASA40产品参数

型号:	MAX6665ASA40
是否无铅：	含铅
生命周期：	Active
IHS 制造商：	ROCHESTER ELECTRONICS LLC
零件包装代码：	SOIC
包装说明：	0.150 INCH, SOIC-8
针数：	8
Reach Compliance Code：	unknown
风险等级：	5.56
Is Samacsys：	N
模拟集成电路 - 其他类型：	ANALOG CIRCUIT
JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e0
长度：	4.9 mm
湿度敏感等级：	1
功能数量：	1
端子数量：	8
最高工作温度：	125 °C
最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP
封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	245
认证状态：	COMMERCIAL
座面最大高度：	1.75 mm
最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	2.7 V
标称供电电压 (Vsup)：	3.3 V
表面贴装：	YES
技术：	BICMOS
温度等级：	AUTOMOTIVE
端子面层：	TIN LEAD
端子形式：	GULL WING
端子节距：	1.27 mm
端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	3.9 mm
Base Number Matches：	1

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