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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6644 Datasheet

Automatic PWM Fan-Speed Controllers

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19-3305; Rev 2; 3/07
EVAALVUAAILTAIOBNLEKIT
Automatic PWM Fan-Speed Controllers with
Overtemperature Output
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 fan’s power supply. The
MAX6643/MAX6644/MAX6645 monitor temperature and
adjust the duty cycle of the PWM output waveform to con-
trol the fan’s speed according to the cooling needs of the
system. The MAX6643 monitors its own die temperature
and an optional external transistor’s 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°C 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 device’s functions.
The MAX6643 and MAX6644 are available in a small
16-pin QSOP package and the MAX6645 is available in
a 10-pin µMAX® package. All versions operate from
3.0V to 5.5V supply voltages and consume 500µA (typ)
supply current.
Applications
Networking Equipment
Storage Equipment
Servers
Desktop Computers
Workstations
Features
Simple, Automatic Fan-Speed Control
Internal and External Temperature Sensing
Detect Fan Failure Through Locked-Rotor Output,
Tachometer Output, or Fan-Supply Current
Sensing
Multiple, 1.6% Output Duty-Cycle Steps for Low
Audibility of Fan-Speed Changes
Pin-Selectable or Factory-Selectable Low-
Temperature Fan Threshold
Pin-Selectable or Factory-Selectable High-
Temperature Fan Threshold
Spin-Up Time Ensures Fan Start
Fan-Start Delay Minimizes Power-Supply Load at
Power-Up
32Hz PWM Output
Controlled Duty-Cycle Rate-of-Change Ensures
Good Acoustic Performance
2°C Temperature-Measurement Accuracy
FULLSPD/FULLSPD Input Sets PWM to 100%
Pin-Selectable OT Output Threshold
16-Pin QSOP and 10-Pin µMAX Packages
Ordering Information
PART
MAX6643LBFAEE
MAX6643LBBAEE
MAX6644LBAAEE
MAX6645ABFAUB
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
-40°C to +125°C 16 QSOP
-40°C to +125°C 16 QSOP
E16-1
E16-1
-40°C to +125°C 16 QSOP
-40°C to +125°C 10 µMAX
E16-1
U10-2
Pin Configurations, Typical Operating Circuit, and Selector
Guide appear at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6644 Datasheet

Automatic PWM Fan-Speed Controllers

No Preview Available !

Automatic PWM Fan-Speed Controllers with
Overtemperature Output
ABSOLUTE MAXIMUM RATINGS
VDD to GND ..............................................................-0.3V to +6V
PWM_OUT, OT, and FANFAIL to GND.....................-0.3V to +6V
FAN_IN1 and FAN_IN2 to GND...........................-0.3V to +13.2V
DXP_ to GND.........................................................-0.3V to +0.8V
FULLSPD, FULLSPD, TH_, TL_, TACHSET,
and OT_ to GND ..................................-0.3V to +(VDD + 0.3V)
FANFAIL, OT Current ..........................................-1mA to +50mA
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C).......... 667mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
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
(VDD = +3.0V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = +3.3V, TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Operating Supply Voltage Range
VDD
+3.0
+5.5
V
Remote Temperature Error
VDD = +3.3V,
+20°C TRJ
+100°C
TA = +20°C to +60°C
TA = 0°C to +125°C
±2
°C
±3
Local Temperature Error
Temperature Error from Supply
Sensitivity
VCC = +3.3V
TA = +10°C to +70°C
TA = 0°C to +125°C
±0.2
±2.5
±3.5
°C
°C/V
Power-On-Reset (POR) Threshold
POR Threshold Hysteresis
Operating Current
Average Operating Current
Remote-Diode Sourcing Current
Conversion Time
Spin-Up Time
Startup Delay
VDD falling edge
IS During a conversion
Duty cycle = 50%, no load
High level
MAX664_ _B_ _ _ _
MAX664_ _B_ _ _ _
1.5 2.0 2.5
V
90 mV
0.5 1 mA
0.5 mA
80 100 120 µA
125 ms
8s
0.5 s
Minimum Fan-Fail Tachometer
Frequency
PWM_OUT Frequency
FPWM_OUT
DIGITAL OUTPUTS (OT, FANFAIL, PWM_OUT)
Output Low Voltage (OT)
VOL ISINK = 1mA
Output Low Voltage
(FANFAIL, PWM_OUT)
VOL
ISINK = 6mA
ISINK = 1mA
Output-High Leakage Current
IOH VOH = 3.3V
16
32
0.4
0.5
0.4
1
Hz
Hz
V
V
µA
2 _______________________________________________________________________________________


Part Number MAX6644
Description Automatic PWM Fan-Speed Controllers
Maker Maxim Integrated Products
Total Page 17 Pages
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