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Data Sheet

FULL DATA SHEET (PDF, 304kB) Download   E-Mail

Description

The MAX6650/MAX6651 fan controllers use an SMBus™/I²C-compatible interface to regulate and monitor the speed of 5VDC/12VDC brushless fans with built-in tachometers. They automatically force the fan's tachometer frequency (fan speed) to match a preprogrammed value in the Fan-Speed Register by using an external MOSFET or bipolar transistor to linearly regulate the voltage across the fan. The MAX6650 regulates the speed of a single fan by monitoring its tachometer output. The MAX6651 also regulates the speed of a single fan, but it contains additional tachometer inputs to monitor up to four fans and control them as a single unit when they are used in parallel. The MAX6650/MAX6651 provide general-purpose input/output (GPIO) pins that serve as digital inputs, digital outputs, or various hardware interfaces. Capable of sinking 10mA, these open-drain inputs/outputs can drive an LED. To add additional hardware control, configure GPIO1 to fully turn on the fan in case of software failure. To generate an interrupt when a fault condition is detected, configure GPIO0 to behave as an active-low alert output. Synchronize multiple devices by setting GPIO2 (MAX6651 only) as an internal clock output or an external clock input. The MAX6650 is available in a space-saving 10-pin µMAX® package, and the MAX6651 is available in a small 16-pin QSOP package.

Key Features		Applications/Uses
Closed/Open-Loop Fan-Speed Control for 5V/12V Fans 2-Wire SMBus/I²C-Compatible Interface Monitors Tachometer Output Single Tachometer (MAX6650) Up to Four Tachometers (MAX6651) Programmable Alert Output GPIOs Hardware Full-On Override Synchronize Multiple Fans Four Selectable Slave Addresses 3V to 5.5V Supply Voltage Small Packages 10-Pin µMAX (MAX6650) 16-Pin QSOP (MAX6651)		Computers: Desktop, Workstation, Server Networking RAID Servers Telecommunications Workstations

Diagram

Typical Operating Circuit

Application Notes

Application Note 809: Rev Up Your Fan Speed Control Designs - MAX6650, MAX6651 Application Note 896: Fan Control Advances: Consider Fan Regulation - MAX6650, MAX6651 Application Note 1784: Fan Speed Control is Cool! - MAX6650, MAX6651 Application Note 1814: Speed Control For Isolated -48V Fans - MAX6650, MAX6651 Application Note 3149: Circuit Converts PWM to Amplified and Buffered Linear Signal - MAX6650, MAX6651 Application Note 3361: Using the MAX6650 and MAX6651 Fan Speed Regulators with 24V and 48V Fans - MAX6650, MAX6651

Evaluation Kits

MAX6651EVCMAXQU, MAX6651EVKIT

Design Guides

TEMP SENSORS (PDF)

Reliability Reports

Show FIT data for: MAX6650 MAX6651 Reliability Report: MAX6650EUB.pdf MAX6651EEE.pdf

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: 1-9 of 9
MAX6650	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6650EUB			uMAX;10 pin;15 mm² Dwg: 21-0061J (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6650EUB-T			uMAX;10 pin;15 mm² Dwg: 21-0061J (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6650EUB+			uMAX;10 pin;15 mm² Dwg: 21-0061J (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6650EUB+T			uMAX;10 pin;15 mm² Dwg: 21-0061J (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6651	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6651EVSYS					See data sheet
MAX6651EEE			QSOP;16 pin;31 mm² Dwg: 21-0055G (PDF) Use pkgcode/variation: E16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6651EEE-T			QSOP;16 pin;31 mm² Dwg: 21-0055G (PDF) Use pkgcode/variation: E16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6651EEE+			QSOP;16 pin;31 mm² Dwg: 21-0055G (PDF) Use pkgcode/variation: E16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6651EEE+T			QSOP;16 pin;31 mm² Dwg: 21-0055G (PDF) Use pkgcode/variation: E16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2000-08-03  Temperature Family by Product Type

Related Products

MAX1669 Fan Controller and Remote Temperature Sensor with SMBus Serial Interface

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