Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsPMICsTC652AEVUA

 2002-2012 Microchip Technology Inc. DS21452C-page 1

TC652/TC653

Features

• Integrated Temperature Sensing and Multi-speed

Fan Control

• FanSense™ Fan Fault Detect Circuitry

• Built-in Over-Temperature Alert (T

OVER

)

• Temperature Proportional Fan Speed Control for

Acoustic Noise Reduction and Longer Fan Life

• Pulse Width Modulation Output Drive for Cost

and Power Savings

• Solid-State Temperature Sensing

• ±1°C (Typical) Accuracy from 25°C to +70°C

• 2.8V – 5.5V Operating Range

• TC653 includes Auto Fan Shutdown

• Low Operating Current: 50A (Typical)

Applications

• Thermal Protection For Personal Computers

• Digital Set-Top Boxes

• Notebook Computers

• Data Communications

• Power Supplies

•Projectors

Related Literature

• Application Note: AN771

Device Selection Table

The "X" denotes a suffix for temperature threshold settings.

Contact factory for other temperature ranges.

Package Type

General Description

The TC652/TC653 are integrated temperature sensors

and brushless DC fan speed controllers with

FanSense

™

technology. The TC652/TC653 measure

their junction temperature and control the speed of the

fan based on that temperature, making them especially

suited for applications in modern electronic equipment.

The FanSense

™

Fan Fault detect circuitry eliminates

the need for a more expensive 3-wire fan.

Temperature data is converted from the on-chip

thermal sensing element and translated into a

fractional fan speed from 40% to 100%. A temperature

selection guide in the data sheet is used to choose the

low and high temperature limits to control the fan. The

TC652/TC653 also include a single trip point over

temperature alert (T

OVER

) that eliminates the need for

additional temperature sensors. In addition, the TC653

includes an auto fan shutdown function for additional

power savings.

The TC652/TC653 are easy to use, require no software

overhead and are therefore the ideal choice for

implementing thermal management in a variety of

systems.

Part Number Package Temperature Range

TC652XXVUA 8-Pin MSOP -40C to +125C

TC653XXVUA 8-Pin MSOP -40C to +125C

X Temperature

A25

B30

C35

D40

E45

F50

G55

FAULT

MSOP

GND

PWM

OVER

SENSE

GND

TC652

TC653

SHDN

Integrated Temperature Sensor & Brushless DC Fan

Controller with FanSense™ Detect & Over-Temperature

Summary of content (16 pages)

PAGE 1
TC652/TC653 Integrated Temperature Sensor & Brushless DC Fan Controller with FanSense™ Detect & Over-Temperature Features Package Type • Integrated Temperature Sensing and Multi-speed Fan Control • FanSense™ Fan Fault Detect Circuitry • Built-in Over-Temperature Alert (TOVER) • Temperature Proportional Fan Speed Control for Acoustic Noise Reduction and Longer Fan Life • Pulse Width Modulation Output Drive for Cost and Power Savings • Solid-State Temperature Sensing • ±1°C (Typical) Accuracy from 25°C to +
PAGE 2
TC652/TC653 Typical Application Diagram +12V DC Fan 300mA Max. TC652 TC653 +5V VDD 1k 1 VDD PWM 8 2 FAULT GND 7 3 SHDN TOVER 6 4 GND FanSense™ 0.01µF SENSE 5 CSENSE GND SHDN Control Over-Temp Alert RSENSE 2Ω Fan Fault Alert µController DS21452C-page 2  2002-2012 Microchip Technology Inc.
PAGE 3
TC652/TC653 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings* Input Voltage (VDD to GND) ................................... +6V *Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied.
PAGE 4
TC652/TC653 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: Pin No. (8-Pin MSOP) PIN FUNCTION TABLE Symbol Description 1 VDD 2 FAULT Power Supply Input. May be independent of fan power supply. Fan Fault Alert, Active-Low Output. FAULT goes low to indicate a fan FAULT condition. When FAULT occurs, the device is latched in Shutdown mode with PWM low. Toggling the SHDN pin or cycling the VDD will release the part and fan from shutdown.
PAGE 5
TC652/TC653 3.0 DETAILED DESCRIPTION The TC652/TC653 acquire and convert their junction temperature (TJ) information from an on-chip solid state sensor with a typical accuracy of ±1°C. The temperature data is digitally stored in an internal register. The register is compared with pre-defined threshold values. The six threshold values are equally distributed over a pre-defined range of temperatures (See Table 3-1 and Table 3-2).
PAGE 6
TC652/TC653 3.2 Start-Up Timer To ensure reliable fan start-up, the Start-up Timer turns PWM high for about 2 seconds whenever the fan is started from the off state. This occurs at power-up and when coming out of Shutdown mode. 3.3 SENSE Input (FanSense™ Technology) The SENSE input, Pin 5, is connected to a low value current sensing resistor in the ground return leg of the fan circuit through the capacitor. During normal fan operation, commutation occurs as each pole of the fan is energized.
PAGE 7
TC652/TC653 TABLE 3-3: TEMPERATURE SELECTION GUIDE Temp. Range °C TL TH Part # 10°C 25 35 AC 30 40 BD 35 45 CE 25 40 AD 30 45 BE 25 45 AE 30 50 BF 35 55 CG 25 55 AG 15°C 20°C 30°C 4.0 TYPICAL APPLICATIONS 4.1 Reducing Switching Noise For fans consuming more than 300mA, a slowdown capacitor (CSLOW) is recommended for reducing switching PWM induced noise (see Figure 4-1). The value of this capacitor should be 4.7F to 47F, depending on the fan current consumption.
PAGE 8
TC652/TC653 5.0 TYPICAL CHARACTERISTICS The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. IDD vs. Temperature Temp Accuracy vs.
PAGE 9
TC652/TC653 6.0 PACKAGING INFORMATION 6.1 Package Marking Information Package marking data not available at this time. 6.2 Taping Form Component Taping Orientation for 8-Pin MSOP Devices User Direction of Feed PIN 1 W P Standard Reel Component Orientation for TR Suffix Device Carrier Tape, Number of Components Per Reel and Reel Size Package 8-Pin MSOP  2002-2012 Microchip Technology Inc.
PAGE 10
TC652/TC653 6.3 Package Dimensions Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 8-Pin MSOP PIN 1 .122 (3.10) .114 (2.90) .197 (5.00) .189 (4.80) .026 (0.65) TYP. .122 (3.10) .114 (2.90) .043 (1.10) MAX. .016 (0.40) .010 (0.25) .006 (0.15) .002 (0.05) .008 (0.20) .005 (0.13) 6° MAX. .028 (0.70) .016 (0.40) Dimensions: inches (mm) DS21452C-page 10  2002-2012 Microchip Technology Inc.
PAGE 11
TC652/TC653 7.0 REVISION HISTORY Revision C (December 2012) Added a note to each package outline drawing.  2002-2012 Microchip Technology Inc.
PAGE 12
TC652/TC653 NOTES: DS21452C-page 12  2002-2012 Microchip Technology Inc.
PAGE 13
TC652/TC653 SALES AND SUPPORT Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. Your local Microchip sales office The Microchip Worldwide Site (www.microchip.com) Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
PAGE 14
TC652/TC653 NOTES: DS21452C-page 14  2002-2012 Microchip Technology Inc.
PAGE 15
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 16
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