Maxim > Products > Thermal Management > MAX6660

MAX6660

Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX6660 is a remote temperature sensor and fan-speed regulator that provides a complete fan-control solution. The remote temperature sensor is typically a common-collector PNP, such as a substrate PNP of a microprocessor, or a diode-connected transistor, typically a low-cost, easily mounted 2N3904 NPN type or 2N3906 PNP type.

The device also incorporates a closed-loop fan controller that regulates fan speed with tachometer feedback. The MAX6660 compares temperature data to a fan threshold temperature and gain setting, both programmed over the SMBus^™ by the user. The result is automatic fan control that is proportional to the remote-junction temperature. The temperature feedback loop can be broken at any time for system control over the speed of the fan.

Fan speed is voltage controlled as opposed to PWM controlled, greatly reducing acoustic noise and maximizing fan reliability. An on-chip power device drives fans rated up to 250mA.

Temperature data is updated every 0.25s and is readable at any time over the SMBus interface. The MAX6660 is accurate to 1°C (max) when the remote junction is between +60°C to +100°C. Data is formatted as a 10-bit + sign word with 0.125°C resolution.

The MAX6660 is specified for -40°C to +125°C and is available in a 16-pin QSOP package.

Data Sheet

Download	Rev 1	(PDF, 912kB)
E-Mail

An evaluation kit is available: MAX6660EVKIT, MAX6660EVSYS

Key Features

Integrated Thermal Sensing and Fan-Regulation Solution
Programmable Fan Threshold Temperature
Programmable Temperature Range for Full-Scale Fan Speed
Accurate Closed-Loop Fan-Speed Regulation
On-Chip Power Device Drives Fans Rated Up to 250mA
Programmable Under/Overtemperature Alarms
SMBus 2-Wire Serial Interface with Timeout (Cannot "Lock Up" the SMBus)
Supports SMBus Alert Response
ACPI Compatible, Including OVERT-bar System Shutdown Function
±1°C (+60°C to +100°C) Thermal-Sensing Accuracy
MAX6660EVKIT Available

Applications/Uses

Industrial Control Systems
Notebook Computers
PC
Servers
Telecom Systems
Workstations

Key Specifications:

Fan Controllers

Part Number

Sensor Type

Fan Cntrl.

Interface

Accuracy
(±°C)

Temp. Thresh.
(°C)

Temp. Resolution
(bits)

Budgetary Price

See Notes

MAX6660

Remote

Linear

2-Wire/I²C/SMBus

Programmable

$3.19 @1k

See All Fan Controllers (19)

Pricing 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.

Diagram

Typical Operating Circuit

Application Notes

Application Note 1057		Compensating for Ideality Factor and Series Resistance Differences between Thermal-Sense Diodes
Application Note 3149		Circuit Converts PWM to Amplified and Buffered Linear Signal
Application Note 3173		Automatic Fan Control Techniques: Trends in Cooling High-Speed Chips
Application Note 3502		Effect of PC Board Trace Width on Remote-Diode Temperature-Sensor Accuracy
Tutorial 4679		Thermal Management Handbook

Product Guides

Thermal Management (PDF)

Reliability Reports

Show FIT data for:
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Software/Models

none

Ordering Information

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Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6660AEE			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6660AEE+			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6660AEE+T			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6660AEE-T			Active	QSOP;16 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

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Evaluation Kits

MAX6660EVKIT, MAX6660EVSYS

Evaluation System/Evaluation Kit for the MAX6660

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