MAX6514UKP055+T - Maxim Integrated

General Description

The MAX6514/MAX6515 low-cost, fully integrated temper-

ature switches assert a logic signal when their die tem-

perature crosses a factory-programmed threshold.

Operating from a 2.7V to 5.5V supply, these devices fea-

ture a fixed voltage reference, an analog temperature

sensor, and a comparator. They are available with facto-

ry-trimmed temperature trip thresholds from -45°C to

+15°C and +35°C to +115°C in 10°C increments, and are

accurate to ±1°C (typ). These devices require no external

components and typically consume 22µA of supply cur-

rent. Hysteresis is pin selectable at 2°C or 10°C.

The MAX6514/MAX6515 are offered with hot-tempera-

ture thresholds (+35°C to +115°C), asserting when the

temperature is above the threshold or with cold-temper-

ature thresholds (-45°C to +15°C), asserting when the

temperature is below the threshold. The MAX6514/

MAX6515 can be used over a -35°C to +125°C range

with a supply voltage of 2.7V to 5.5V. For applications

sensing temperature down to -45°C, a supply voltage

above 4.5V is required.

The MAX6514 has an active-high, push-pull output. The

MAX6515 has an active-low, open-drain output. These

devices are available in a space-saving 5-pin SOT23

package and operate over the -55°C to +125°C tem-

perature range.

Applications

Over/Undertemperature Protection

Fan Control

Test Equipment

Temperature Control

Temperature Alarms

Notebook, Desktop PCs

RAID

Servers

Features

♦High-Accuracy ±1.5°C (max) over -15°C to +65°C

Temperature Range

♦Low-Power Consumption: 22µA Typical Current

♦Factory-Programmed Thresholds from -45°C to

+115°C in 10°C Increments

♦Open-Drain or Push-Pull Outputs

♦Pin-Selectable 2°C or 10°C Hysteresis

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-3147; Rev 1; 2/11

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Pin Configurations and Functional Diagram appear at end of

data sheet.

PART TEMP RANGE PIN-

PACKAGE

MAX6514UK_ _ _ _+T -55°C to +125°C 5 SOT23

MAX6515UK_ _ _ _+T -55°C to +125°C 5 SOT23

Note: These parts are offered in 16 standard temperature ver-

sions with a minimum order of 2500 pieces. To complete the

suffix information, add P or N for positive or negative trip tem-

perature, and select an available trip point in degrees centi-

grade. For example, the MAX6514UKP065+T describes a

MAX6514 in a 5-pin SOT23 package with a +65°C threshold in

tape and reel (2.5k minimum order). Contact the factory for

pricing and availability.

Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

Typical Operating Circuit

MAX6515 MICROCONTROLLER

VCC

0.1μF

VCC

100kΩ

GND

GND HYST

INT

TOVER

GND

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC = 2.7V to 5.5V, RPULLUP = 100kΩ, (open-drain output only), TA= -55°C to +125°C, unless otherwise noted. Typical values are

at TA = +25°C.) (Note 1)

Stresses beyond 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 beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design.

Note 2: The MAX6514/MAX6515 are available with internal factory-programmed temperature trip thresholds from -45°C to +15°C

and +35°C to +115°C in 10°C increments.

Note 3: VCC must be greater than 4.5V for a switching threshold of -45°C.

Note 4: Guaranteed by design.

All Voltages Are Referenced to GND

VCC ..........................................................................-0.3V to +6V

TOVER, TUNDER (open drain)................................ -0.3V to +6V

TOVER, TUNDER (push-pull)....................... -0.3V to VCC + 0.3V

HYST.............................................................-0.3V to VCC + 0.3V

Continuous Power Dissipation

SOT23 (derate 3.1mW/°C above +70°C).....................247mW

Operating Temperature Range ........................-55°C to +125°C

Junction Temperature..................................................... +150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) ................................ +300°C

Soldering Temperature ....................................................+260°C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage Range VCC 2.7 5.5 V

Hot-temperature thresholds

(+35°C to +115°C) 22 40

Supply Current ICC Cold-temperature thresholds

(-45°C to +15°C) 40

µA

-15°C to +65°C -1.5 +1.5

+75°C to +115°C -2.5 +2.5

Temperature Threshold Accuracy

(Note 2) ΔTTH

-45°C to -25°C (Note 3) -3 +3

°C

HYST = VCC 2

Temperature Threshold

Hysteresis THYST HYST = GND 10 °C

VIH 0.8 x VCC

HYST Input Threshold (Note 4) VIL 0.2 x VCC

ISOURCE = 500µA, VCC > 2.7V 0.8 x VCC

Logic Output Voltage High

(Push-Pull) VOH ISOURCE = 800µA, VCC > 4.5V VCC - 1.5 V

ISINK = 1.2mA, VCC > 2.7V 0.3

Logic Output Voltage Low

(Push-Pull and Open Drain) VOL ISINK = 3.2mA, VCC > 4.5V 0.4 V

Open-Drain Output Leakage

Current VCC = 2.7V, open-drain output = 5.5V 10 nA

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

_______________________________________________________________________________________

TRIP THRESHOLD ACCURACY

MAX6514 toc01

ACCURACY (°C)

PERCENTAGE OF PARTS SAMPLED (%)

-0.25 TO

-0.5

-0.75 TO

-1.0

-1.25 TO

-1.5

0.25 TO

0.5

0.75 TO

1.0

1.25 TO

1.5

SAMPLE SIZE = 147

SUPPLY CURRENT

vs. TEMPERATURE

MAX6514 toc02

TEMPERATURE (°C)

SUPPLY CURRENT (μA)

105856545255-15-35

-55 125

TOVER/TUNDER OUTPUT VOLTAGE HIGH

vs. SOURCE CURRENT

MAX6514 toc03

ISINK (mA)

VOH (V)

987654321

010

MAX6514 toc04

ISINK (mA)

VOL (V)

987654321

100

200

300

400

500

010

TOVER/TUNDER OUTPUT VOLTAGE LOW

vs. SINK CURRENT

STARTUP AND POWER-DOWN (TEMP < TTH)

MAX6514 toc05

TIME (400μs/div)

VCC

(2V/div)

TOVER

(2V/div)

STARTUP DELAY (TEMP > TTH)

MAX6514 toc06

TIME = 100μs

VCC

(2V/div)

TOVER

(2V/div)

Typical Operating Characteristics

(VCC = 4.5V, TA = +25°C, unless otherwise noted.)

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

4 _______________________________________________________________________________________

Pin Description

Detailed Description

The MAX6514/MAX6515 fully integrated temperature

switches incorporate a fixed reference, an analog tem-

perature sensor, and a comparator. Pin-selectable 2°C

or 10°C hysteresis keeps the digital output from oscil-

lating when the die temperature approaches the

threshold temperature. The MAX6514 has an active-

high, push-pull output structure that can sink or source

current. The MAX6515 has an active-low, open-drain

output structure that can only sink current. The internal

power-on reset circuit guarantees the logic output is at

its +25°C state for at least 50µs.

Hysteresis Input

The HYST input selects the devices’ temperature hys-

teresis and prevents the output from oscillating when the

temperature approaches the trip point. Connect HYST to

VCC for 2°C hysteresis or to GND for 10°C hysteresis.

Logic Temperature Indicators

Overtemperature Indicator (Hot Thresholds)

TOVER and TOVER designations apply to thresholds

above TA= +25°C (+35°C, +45°C, +55°C, +65°C,

+75°C, +85°C, +95°C, +105°C, and +115°C). All “hot”

thresholds are positive temperatures.

The overtemperature indicator output is open drain

active low (TOVER) or push-pull active high (TOVER).

TOVER goes low when the die temperature exceeds

the factory-programmed temperature threshold. TOVER

should be pulled up to a voltage no greater than 5.5V

with a 100kΩpullup resistor. TOVER is a push-pull

active-high CMOS output that goes high when the die

temperature exceeds the factory-programmed temper-

ature threshold.

Undertemperature Indicator (Cold Thresholds)

TUNDER and TUNDER designations apply to thresh-

olds below TA= +25°C (+15°C, +5°C, -5°C, -15°C,

-25°C, -35°C, -45°C). The undertemperature indicator

output is open-drain, active low (TUNDER) or push-pull,

active high (TUNDER). TUNDER goes low when the die

temperature goes below the factory-programmed tem-

perature threshold. TUNDER should be pulled up to a

voltage no greater than 5.5V with a 100kΩpullup resis-

tor. TUNDER is a push-pull active-high CMOS output

that goes high when the die temperature falls below the

factory-programmed temperature threshold.

MAX6514 MAX6515 NAME FUNCTION

1, 2 1, 2 GND Ground

3 3 HYST Hysteresis Input. Connect to VCC for 2°C of hysteresis or to GND for 10°C hysteresis.

44V

CC Input Supply. Bypass to ground with a 0.1µF capacitor.

5 — TOVER Push-Pull Active-High Output (Hot Threshold). TOVER goes high when the die temperature

exceeds the factory-programmed hot-temperature threshold.

—5TOVER

Open-Drain, Active-Low Output (Hot Threshold). TOVER goes low when the die temperature

exceeds the factory-programmed hot-temperature threshold. Connect to a 100kΩ pullup

resistor. Can be pulled up to a voltage higher than VCC.

5 — TUNDER Push-Pull Active-High Output (Cold Threshold). TUNDER goes high when the die temperature

falls below the factory-programmed cold-temperature threshold.

—5TUNDER

Open-Drain, Active-Low Output (Cold Threshold). TUNDER goes low when the die

temperature goes below the factory-programmed cold-temperature threshold. Connect to a

100kΩ pullup resistor. Can be pulled up to a voltage higher than VCC.

Applications Information

Temperature-Window Alarm

The MAX6515 logic output asserts when the die tem-

perature is outside the factory-programmed range.

Combining the outputs of two devices creates an

over/undertemperature alarm. Two MAX6515s are used

to form two complementary pairs, containing one cold

trip-point output and one hot trip-point output. The

assertion of either output alerts the system to an out-of-

range temperature (Figure 1).

The thermal overrange signal can be used to assert a

thermal shutdown, power-up, recalibration, or other

temperature-dependent function.

Low-Cost, Fail-Safe Temperature

In high-performance/high-reliability applications, multi-

ple temperature monitoring is important. The high-level

integration and low cost of the MAX6514/MAX6515

facilitate the use of multiple temperature monitors to

increase system reliability. The Figure 2 application

uses two MAX6514s with different hot-temperature

thresholds to ensure that fault conditions that can over-

heat the monitored device cause no permanent dam-

age. The first temperature monitor activates the fan

when the die temperature exceeds +45°C. The second

MAX6514 triggers a system shutdown if the die temper-

ature reaches +75°C, preventing damage from a wide

variety of destructive fault conditions, including

latchups, short circuits, and cooling-system failures.

Thermal Considerations

The MAX6514/MAX6515 supply current is typically

22µA. When used to drive high-impedance loads, the

devices dissipate negligible power and self-heating

effects are minimized.

Accurate temperature monitoring depends on the ther-

mal resistance between the device being monitored

and the MAX6514/MAX6515 die. Heat flows in and out

of plastic packages, primarily through the leads. Pin 2

of the 5-pin SOT23 package provides the lowest ther-

mal resistance to the die. Short, wide copper traces

between the MAX6514/MAX6515 and the objects

whose temperature is being monitored ensure heat

transfers occur quickly and reliably. The rise in die tem-

perature due to self-heating is given by the following

formula:

ΔTJ= PDISSIPATION x θJA

where PDISSIPATION is the power dissipated by the

MAX6514/MAX6515, and θJA is the thermal resistance

of the package.

The typical thermal resistance is +140°C/W for the 5-

pin SOT23 package. To limit the effects of self-heating,

minimize the output current. For example, if the

MAX6514/MAX6515 sink 1mA, the open-drain output

voltage is guaranteed to be less than 0.3V. Therefore,

an additional 0.3mW of power is dissipated within the

IC. This corresponds to a 0.042°C shift in the die tem-

perature in the 5-pin SOT23 package.

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

_______________________________________________________________________________________ 5

MAX6515UKP075 MAX6515UKN005

VCC VCC

+5V

100kΩ

GND

GND HYST

TUNDER

TOVER

GND

OUT OF RANGE

GND HYST

VCC

+5V

SYSTEM

SHUTDOWN

MAX6514UKP075

GND

μP

GND HYST

TOVER

VCC FAN

CONTROL

MAX6514UKP045

GND

TOVERHYST

GND

HEAT

Figure 1. Temperature-Window Alarms Using the MAX6515

Figure 2. Low-Power, High-Reliability, Fail-Safe Temperature

Monitor

MAX6514/MAX6515

Chip Information

PROCESS: BiCMOS

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

6 _______________________________________________________________________________________

Table 1. Top Marks

PART TOP MARK

MAX6514UKN005 AEKU

MAX6514UKN015 AEKV

MAX6514UKN025 AEKW

MAX6514UKN035 AECV

MAX6514UKN045 AEKX

MAX6514UKP005 AEKY

MAX6514UKP015 AEKZ

MAX6514UKP035 AELA

MAX6514UKP045 AELB

MAX6514UKP055 AELC

MAX6514UKP065 AELD

MAX6514UKP075 AECW

MAX6514UKP085 AELE

MAX6514UKP095 AELF

MAX6514UKP105 AELG

MAX6514UKP115 AELH

PART TOP MARK

MAX6515UKN005 AEMK

MAX6515UKN015 AEML

MAX6515UKN025 AEMM

MAX6515UKN035 AECX

MAX6515UKN045 AEMN

MAX6515UKP005 AEMO

MAX6515UKP015 AEMP

MAX6515UKP035 AEMQ

MAX6515UKP045 AEMR

MAX6515UKP055 AEMS

MAX6515UKP065 AEMT

MAX6515UKP075 AECY

MAX6515UKP085 AEMU

MAX6515UKP095 AEMV

MAX6515UKP105 AEMW

MAX6515UKP115 AEMX

GND

VCC

HOT THRESHOLDS (+35°C TO +115°C)

HYST

15(TOVER)

TOVER

GND

(MAX6514)

MAX6515

SOT23

TOP VIEW

GND

VCC

COLD THRESHOLDS (-45°C TO +15°C)

HYST

15(TUNDER)

TUNDER

GND

(MAX6514)

MAX6515

SOT23

Pin Configurations

Package Information

For the latest package outline information and land patterns

(footprints), go to www.maxim-ic.com/packages. Note that a

“+”, “#”, or “-” in the package code indicates RoHS status only.

Package drawings may show a different suffix character, but

the drawing pertains to the package regardless of RoHS status.

PACKAGE

TYPE

PACKAGE

CODE

OUTLINE

NO.

LAND

PATTERN NO.

5 SOT23 U5+2 21-0057 90-0174

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

_______________________________________________________________________________________ 7

MAX6514/MAX6515 Functional Diagram

FIXED

REFERENCE

HYST

NETWORK HYST

TOVER

COLD

MAX6514 (HOT THRESHOLD)

+25°CT

TH HOT TEMP

NEGATIVE

TEMPCO

SENSOR

MAX6514

FIXED

REFERENCE

HYST

NETWORK HYST

TOVER TOVER

COLD

MAX6515 (HOT THRESHOLD)

WITH 100kΩ PULLUP

+25°CT

TH HOT TEMP

NEGATIVE

TEMPCO

SENSOR

MAX6515

FIXED

REFERENCE

HYST

NETWORK HYST

TUNDER

COLD

MAX6514 (COLD THRESHOLD)

+25°C

TTH HOT TEMP

NEGATIVE

TEMPCO

SENSOR

MAX6514

FIXED

REFERENCE

HYST

NETWORK HYST

TUNDER

COLD

MAX6515 (COLD THRESHOLD)

WITH 100kΩ PULLUP

+25°C

TTH HOT TEMP

NEGATIVE

TEMPCO

SENSOR

MAX6515

TUNDER

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

Revision History

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

0 1/04 Initial release —

1 2/11

Changed the leaded parts to lead(Pb)-free parts in the Ordering Information table; in

the Absolute Maximum Ratings section changed the continuous power dissipation

numbers (7.1mW/°C to 3.1mW/°C and 571mW to 247mW); added the Package

Information table

1, 2, 6