MAX6643LBBAEE+ Maxim Integrated Products, MAX6643LBBAEE+ Datasheet

IC CNTRLR FAN SPEED 16-QSOP

MAX6643LBBAEE+

Manufacturer Part Number
MAX6643LBBAEE+
Description
IC CNTRLR FAN SPEED 16-QSOP
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX6643LBBAEE.pdf (17 pages)

Specifications of MAX6643LBBAEE+

Function
Fan Control, Temp Monitor
Topology
ADC, PWM Generator, Tach Counter
Sensor Type
External & Internal
Sensing Temperature
-40°C ~ 125°C, External Sensor
Output Type
PWM
Output Alarm
Yes
Output Fan
Yes
Voltage - Supply
3 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-QSOP
Full Temp Accuracy
+/- 3.5 C, +/- 3 C
Digital Output - Bus Interface
Serial (2-Wire)
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
3.0V to 5.5V supply voltages and consume 500µA (typ)
supply current.
19-3305; Rev 2; 3/07
Pin Configurations, Typical Operating Circuit, and Selector
Guide appear at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
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.
Networking Equipment
Storage Equipment
Servers
Desktop Computers
Workstations
Automatic PWM Fan-Speed Controllers with
®
________________________________________________________________ Maxim Integrated Products
package. All versions operate from
General Description
Applications
Overtemperature Output
♦ Simple, Automatic Fan-Speed Control
♦ Internal and External Temperature Sensing
♦ Detect Fan Failure Through Locked-Rotor Output,
♦ Multiple, 1.6% Output Duty-Cycle Steps for Low
♦ Pin-Selectable or Factory-Selectable Low-
♦ Pin-Selectable or Factory-Selectable High-
♦ Spin-Up Time Ensures Fan Start
♦ Fan-Start Delay Minimizes Power-Supply Load at
♦ 32Hz PWM Output
♦ Controlled Duty-Cycle Rate-of-Change Ensures
♦ 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
MAX6643LBFAEE
MAX6643LBBAEE
MAX6644LBAAEE
MAX6645ABFAUB
Tachometer Output, or Fan-Supply Current
Sensing
Audibility of Fan-Speed Changes
Temperature Fan Threshold
Temperature Fan Threshold
Power-Up
Good Acoustic Performance
PART
-40 C to +125 C
-40 C to +125 C
-40 C to +125 C
-40 C to +125 C
TEMP RANGE
Ordering Information
PIN-
PACKAGE
16 QSOP
16 QSOP
16 QSOP
10 µMAX
Features
E16-1
E16-1
E16-1
U10-2
CODE
PKG
1

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MAX6643LBBAEE+ Summary of contents

Page 1

... Workstations 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 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. ...

Page 2

Automatic PWM Fan-Speed Controllers with Overtemperature Output ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V DD 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_, ...

Page 3

Automatic PWM Fan-Speed Controllers with ELECTRICAL CHARACTERISTICS (continued +3.0V to +5.5V - +125 C, unless otherwise noted. Typical values are PARAMETER SYMBOL DIGITAL INPUTS (FULLSPD, FULLSPD, TACHSET) Logic-Input High Logic-Input ...

Page 4

Automatic PWM Fan-Speed Controllers with Overtemperature Output PIN MAX6643 MAX6644 MAX6645 — — — — — 10, 11 10, 11 ...

Page 5

Automatic PWM Fan-Speed Controllers with PIN MAX6643 MAX6644 MAX6645 12 12 13 Detailed Description The MAX6643/MAX6644/MAX6645 measure temperature and automatically adjust fan speed to ensure optimum cooling while minimizing acoustic noise from the fan. The ...

Page 6

Automatic PWM Fan-Speed Controllers with Overtemperature Output Table 2. Setting T LOW (MAX6643 and MAX6644) TL2 TL1 High High-Z 0 High-Z High-Z High High High-Z = High impedance. There ...

Page 7

Automatic PWM Fan-Speed Controllers with T , the duty cycle may increase just a few percent HIGH above the minimum duty cycle. If the power dissipation or ambient temperature increases to a high-enough value, the duty cycle may eventually need ...

Page 8

Automatic PWM Fan-Speed Controllers with Overtemperature Output Table 3. Configuring the FAN_IN_ Inputs with TACHSET VDD TACHSET FAN_IN1 MAX6643 Tachometer MAX6644 Tachometer MAX6645 Tachometer Table 4. Setting the Overtemperature Thresholds (T ) (MAX6643 and MAX6644) OVERT OT2 OT1 0 0 ...

Page 9

Automatic PWM Fan-Speed Controllers with 1 TH1 4. FANFAIL FANFAIL ALARM 5 6 DXP2 7 GND 8 DXP1 Figure 3. MAX6644 Using Two External Transistors to Measure Remote Temperatures and Control Two 2-Wire Fans. The fan’s ...

Page 10

Automatic PWM Fan-Speed Controllers with Overtemperature Output 4.7k TO FANFAIL ALARM Figure 5. Using the MAX6645 to Monitor Two Fans 10 ______________________________________________________________________________________ V (+3.0V TO +5.5V 4. FANFAIL TACHSET PWM_OUT TACHOMETER 8 MODE ...

Page 11

Automatic PWM Fan-Speed Controllers with 4.7k TO FANFAIL ALARM 4.7k TO FANFAIL ALARM Figure 6. Using Two MAX6643s, Each Controlling a Separate Fan ______________________________________________________________________________________ Overtemperature Output V (+3.0V TO +5.5V TH1 TL2 TH2 ...

Page 12

Automatic PWM Fan-Speed Controllers with Overtemperature Output Effect of Series Resistance Series resistance in a sense diode contributes addition- al errors. For nominal diode currents of 10µA and 100µA, change in the measured voltage is 100 A 10 ...

Page 13

Automatic PWM Fan-Speed Controllers with 3) Route the DXP and GND traces parallel and close to each other, away from any high-voltage traces such as +12VDC. Avoid leakage currents from PCB conta- mination. A 20M leakage path from DXP to ...

Page 14

Automatic PWM Fan-Speed Controllers with Overtemperature Output TOP VIEW TH1 1 16 TL2 2 15 TL1 3 14 MAX6643 FANFAIL 4 13 TACHSET 5 12 FULLSPD 6 11 (FULLSPD) GND 7 10 DXP 8 9 QSOP () ARE FOR MAX6643_A ...

Page 15

Automatic PWM Fan-Speed Controllers with DXP1/(DXP) TEMPERATURE TEMPERATURE DXP2 SENSOR MAX6643 MAX6644 MAX6645 () ARE FOR MAX6643 ONLY. 1 TH1 2 TL2 4.7k 3 TL1 TO FANFAIL 4 FANFAIL ALARM 5 TACHSET 6 FULLSPD 7 GND 8 DXP ______________________________________________________________________________________ Overtemperature ...

Page 16

Automatic PWM Fan-Speed Controllers with Overtemperature Output (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 16 ______________________________________________________________________________________ Package Information PACKAGE OUTLINE, QSOP .150", .025" LEAD ...

Page 17

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 © 2007 Maxim Integrated Products ...

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