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Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 264kB) Download   E-Mail

Description

The MAX6661 is a remote temperature sensor and fan-speed regulator that provides complete closed-loop fan control. 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 MAX6661 compares temperature data to a fan threshold temperature and gain setting, both programmed over the SPI™ bus 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 500ms and is readable at any time over the SPI interface. The MAX6661 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 MAX6661 is specified between -40°C to +125°C and is available in a 16-pin QSOP package.

Key Features		Applications/Uses
Integrated Thermal Measurement and Fan Regulation 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 SPI-Compatible Serial Interface ±1°C (+60°C to +100°C) Thermal-Sensing Accuracy		Electronic Instruments Servers Telecom Systems Workstations

Diagram

Typical Operating Circuit

Application Notes

Application Note 1057: Compensating for Ideality Factor and Series Resistance Differences between Thermal Sense Diodes - MAX6661 Application Note 3149: Circuit Converts PWM to Amplified and Buffered Linear Signal - MAX6661, MAX6661

Design Guides

Thermal Management (PDF)

Reliability Reports

Show FIT data for: MAX6661 Request Reliability Report for: MAX6661

Software/Models

none

Ordering Information

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. 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: 1-4 of 4

MAX6661	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6661AEE			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
MAX6661AEE-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6661AEE+			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
MAX6661AEE+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet

More Information

New Product Press Release 2002-02-19  Temperature Family by Product Type

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Description   Key Features   Applications/Uses   Key Specifications   Diagram

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