MAX6639, MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller

Description

The MAX6639 monitors its own temperature and one external diode-connected transistor or the temperatures of two external diode-connected transistors, typically available in CPUs, FPGAs, or GPUs. The 2-wire serial interface accepts standard System Management Bus (SMBus™) write byte, read byte, send byte, and receive byte commands to read the temperature data and program the alarm thresholds. Temperature data can be read at any time over the SMBus, and three programmable alarm outputs can be used to generate interrupts, throttle signals, or overtemperature shutdown signals.

The temperature data is also used by the internal dual-PWM fan-speed controller to adjust the speed of up to two cooling fans, thereby minimizing noise when the system is running cool, but providing maximum cooling when power dissipation increases. Speed control is accomplished by tachometer feedback from the fan, so that the speed of the fan is controlled, not just the PWM duty cycle. Accuracy of speed measurement is ±4%.

The MAX6639 is available in 16-pin QSOP and 16-pin thin QFN 5mm x 5mm packages. It operates from 3.0V to 3.6V and consumes just 500µA of supply current.

Key Features

Applications/Uses

Two Thermal-Diode Inputs
Up to 25kHz PWM Output Frequency
Three Selectable SMBus Addresses
Local Temperature Sensor
1°C Remote Temperature Accuracy
Two PWM Outputs for Fan Drive (Open Drain; Can be Pulled Up to +13.5V)
Programmable Fan-Control Characteristics
Automatic Fan Spin-Up Ensures Fan Start
Controlled Rate-of-Change Ensures Unobtrusive Fan-Speed Adjustments
±3% Fan-Speed Measurement Accuracy
Temperature Monitoring Begins at POR for Fail-Safe System Protection
Active-Low OT and Active-Low THERM Outputs for Throttling or Shutdown
Measures Temperatures Up to +150°C
MAX6639F is Optimized for n = 1.021 for Penryn Compatability

	Desktop Computers
	Networking Equipment
	Notebook Computers
	Projectors
	Servers

Key Specifications: Fan Controllers

Part Number

Sensor Type

Functions

Fan Control

Interface

Accuracy (±°C)

Temperature Threshold (°C)

Features

Price^**

MAX6639

Remote

•	Remote & Local Sensor

PWM

2-Wire/I²C/SMBus

Programmable

•	Closed/Open-Loop Fan-Speed Control for 5V/12V Fans

•	Monitors Tachometer Output

•	Selectable Address

•	Two Alarm Outputs

$1.50 @ 1k

See All Fan Controllers (19)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Reliability Reports


		Reliability Report: MAX6639.pdf

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Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
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Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-12 of 12

MAX6639

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX6639AEE+

QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+1*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX6639AEE+T

QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+1*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX6639AEE

QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-1*

-40°C to +125°C

RoHS/Lead-Free: No
Materials Analysis

MAX6639AEE-T

Land Pattern: Not Available

-40°C to +125°C

See data sheet

MAX6639YAEE+

QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+1*

-40°C to +125°C

See data sheet
Materials Analysis

MAX6639YAEE+T

Land Pattern: Not Available

-40°C to +125°C

See data sheet

MAX6639ATE+

TQFN;16 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0072 (PDF)
Use pkgcode/variation: T1655+2*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX6639ATE+T

Land Pattern: Not Available

-40°C to +125°C

See data sheet

MAX6639ATE

TQFN;16 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0072 (PDF)
Use pkgcode/variation: T1655-2*

-40°C to +125°C

RoHS/Lead-Free: No
Materials Analysis

MAX6639ATE-T

Land Pattern: Not Available

-40°C to +125°C

See data sheet

MAX6639F

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX6639FAEE+T

QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+1*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX6639FAEE+

QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+1*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis