MAXIM MAX6514, MAX6515 User Manual

General Description

The MAX6514/MAX6515 low-cost, fully integrated temper­ature switches assert a logic signal when their die tem­perature crosses a factory-programmed threshold.
Operating from a 2.7V to 5.5V supply, these devices fea­ture a fixed voltage reference, an analog temperature
sensor, and a comparator. They are available with facto­ry-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 cur­rent. Hysteresis is pin selectable at 2°C or 10°C.

The MAX6514/MAX6515 are offered with hot-tempera­ture thresholds (+35°C to +115°C), asserting when the
temperature is above the threshold or with cold-temper­ature 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 tem­perature 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

1

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.

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 tem­perature, and select an available trip point in degrees centi­grade. 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

PART TEMP RANGE

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

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

PIN­PACKAGE

V

CC

100kΩ

0.1μF

V

CC

TOVER

MAX6515

V

CC

INT

MICROCONTROLLER

GND

GND HYST

GND

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

CC

= 2.7V to 5.5V, R

PULLUP

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

at T

A

= +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: V

CC

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

Note 4: Guaranteed by design.

All Voltages Are Referenced to GND
V

CC

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

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

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

CC

+ 0.3V

HYST.............................................................-0.3V to V

CC

+ 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 V

Supply Current I

Temperature Threshold Accuracy
(Note 2)

Temperature Threshold
Hysteresis

HYST Input Threshold (Note 4)

Logic Output Voltage High
(Push-Pull)

Logic Output Voltage Low
(Push-Pull and Open Drain)

Open-Drain Output Leakage
Current

CC

Hot-temperature thresholds
(+35°C to +115°C)

Cold-temperature thresholds
(-45°C to +15°C)

-15°C to +65°C -1.5 +1.5

+75°C to +115°C -2.5 +2.5

TH

-45°C to -25°C (Note 3) -3 +3

HYST = V

HYST = GND 10

IH

IL

I

SOURCE

I

SOURCE

I

SINK

I

SINK

V

CC

CC

= 500µA, V

= 800µA, V

= 1.2mA, V

= 3.2mA, V

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

ΔT

T

V

CC

HYST

V

V

OH

V

OL

2.7 5.5 V

22 40

40

2

0.8 x V

CC

0.2 x V

CC

> 2.7V 0.8 x V

CC

> 4.5V VCC - 1.5

CC

> 2.7V 0.3

CC

> 4.5V 0.4

CC

CC

µA

°C

°C

V

V

V

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

_______________________________________________________________________________________

3

Typical Operating Characteristics

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

TRIP THRESHOLD ACCURACY

50

SAMPLE SIZE = 147

40

30

20

10

PERCENTAGE OF PARTS SAMPLED (%)

0

-1.25 TO

-1.5

-0.75 TO

-1.0

0.25 TO

-0.25 TO

-0.5

ACCURACY (°C)

0.75 TO

0.5

1.0

TOVER/TUNDER OUTPUT VOLTAGE HIGH

vs. SOURCE CURRENT

5

4

1.25 TO

1.5

MAX6514 toc03

MAX6514 toc01

SUPPLY CURRENT

30

25

20

15

10

SUPPLY CURRENT (μA)

5

0

-55 125

TOVER/TUNDER OUTPUT VOLTAGE LOW

500

400

vs. TEMPERATURE

MAX6514 toc02

105856545255-15-35

TEMPERATURE (°C)

vs. SINK CURRENT

MAX6514 toc04

3

(V)

OH

V

2

1

0

010

I

(mA)

SINK

STARTUP AND POWER-DOWN (TEMP < TTH)

TIME (400μs/div)

987654321

MAX6514 toc05

V

CC

(2V/div)

TOVER
(2V/div)

300

(V)

OL

V

200

100

0

010

I

(mA)

SINK

STARTUP DELAY (TEMP > TTH)

TIME = 100μs

987654321

MAX6514 toc06

V

CC

(2V/div)

TOVER
(2V/div)

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 tem­perature sensor, and a comparator. Pin-selectable 2°C
or 10°C hysteresis keeps the digital output from oscil­lating when the die temperature approaches the
threshold temperature. The MAX6514 has an active­high, 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 hys­teresis and prevents the output from oscillating when the
temperature approaches the trip point. Connect HYST to
VCCfor 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 100kΩ pullup resistor. TOVER is a push-pull
active-high CMOS output that goes high when the die
temperature exceeds the factory-programmed temper­ature threshold.

Undertemperature Indicator (Cold Thresholds)

TUNDER and TUNDER designations apply to thresh­olds 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 tem­perature threshold. TUNDER should be pulled up to a
voltage no greater than 5.5V with a 100kΩ pullup resis­tor. TUNDER is a push-pull active-high CMOS output
that goes high when the die temperature falls below the
factory-programmed temperature threshold.

PIN

MAX6514 MAX6515

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.

44VCCInput Supply. Bypass to ground with a 0.1µF capacitor.

5 — TOVER

—5TOVER

5 — TUNDER

—5TUNDER

NAME FUNCTION

Push-Pull Active-High Output (Hot Threshold). TOVER goes high when the die temperature
exceeds the factory-programmed hot-temperature threshold.

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 V

Push-Pull Active-High Output (Cold Threshold). TUNDER goes high when the die temperature
falls below the factory-programmed cold-temperature threshold.

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 V

CC

.

.

CC

Applications Information

Temperature-Window Alarm

The MAX6515 logic output asserts when the die tem­perature 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-of­range 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, multi­ple 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 over­heat the monitored device cause no permanent dam­age. The first temperature monitor activates the fan
when the die temperature exceeds +45°C. The second
MAX6514 triggers a system shutdown if the die temper­ature 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 ther­mal 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 ther­mal 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 tem­perature due to self-heating is given by the following
formula:

ΔTJ= P

DISSIPATION

x θ

JA

where P

DISSIPATION

is the power dissipated by the
MAX6514/MAX6515, and θJAis the thermal resistance
of the package.

The typical thermal resistance is +140°C/W for the 5­pin 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 tem­perature in the 5-pin SOT23 package.

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

_______________________________________________________________________________________ 5

Figure 1. Temperature-Window Alarms Using the MAX6515

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

+5V

100kΩ

OUT OF RANGE

V

CC

TOVER

MAX6515UKP075

GND

GND HYST

+5V

V

CC

MAX6514UKP075

HEAT

μP

GND

HEAT

GND

V

CC

MAX6514UKP045

GND

V

CC

TUNDER

MAX6515UKN005

GND

GND HYST

TOVER

HYST

GND

TOVERHYST

GND

SYSTEM

SHUTDOWN

FAN

CONTROL

MAX6514/MAX6515

Chip Information

PROCESS: BiCMOS

Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23

6 _______________________________________________________________________________________

Table 1. Top Marks

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

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

TOP VIEW

HOT THRESHOLDS (+35°C TO +115°C)

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

COLD THRESHOLDS (-45°C TO +15°C)

15(TUNDER)

15(TOVER)

GND

TOVER

(MAX6514)

2

GND

HYST

MAX6515

34

SOT23

V

CC

GND

(MAX6514)

2

GND

HYST

MAX6515

34

SOT23

TUNDER

V

CC

MAX6514/MAX6515

Low-Cost, 2.7V to 5.5V Temperature Switches

in a SOT23

_______________________________________________________________________________________ 7

MAX6514/MAX6515 Functional Diagram

NEGATIVE

TEMPCO
SENSOR

MAX6514

NEGATIVE

TEMPCO

SENSOR

MAX6515

NEGATIVE

TEMPCO
SENSOR

FIXED

REFERENCE

FIXED

REFERENCE

HYST

NETWORK

HYST

NETWORK

TOVER

HYST

TOVER

HYST

TUNDER

V

TOVER

COLD

V

TOVER

COLD

V

TUNDER

MAX6514 (HOT THRESHOLD)

+25°CT

MAX6515 (HOT THRESHOLD)
WITH 100kΩ PULLUP

+25°CT

MAX6514 (COLD THRESHOLD)

TH

TH

HOT

HOT

TEMP

TEMP

MAX6514

NEGATIVE

TEMPCO
SENSOR

MAX6515

FIXED

REFERENCE

FIXED

REFERENCE

HYST

NETWORK

HYST

NETWORK

HYST

TUNDER

HYST

TUNDER

V

COLD

COLD

T

TH

MAX6515 (COLD THRESHOLD)
WITH 100kΩ PULLUP

T

TH

+25°C

+25°C

HOT

HOT

TEMP

TEMP

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.

8

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

© 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

Revision History

REVISION

NUMBER

0 1/04 Initial release —

1 2/11

REVISION

DATE

DESCRIPTION

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
Informat ion table

PAGES

CHANGED

1, 2, 6