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MAX6517
Low-Cost, 2.7V to 5.5V, Analog Temperature Sensor Switches in a SOT23
General Description
The MAX6516–MAX6519 low-cost, fully integrated tem-
perature 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 tempera-
ture sensor, and a comparator. They are available with
factory-trimmed temperature trip thresholds from -45°C
to +115°C in 10°C increments, and are accurate to
±0.5°C (typ). These devices require no external compo-
nents and typically consume 22µA of supply current.
Hysteresis is pin selectable at 2°C or 10°C.
The MAX6516–MAX6519 are offered with hot-tempera-
ture thresholds (+35°C to +115°C), asserting when the
temperature is above the threshold, or with cold-tem-
perature thresholds (-45°C to +15°C), asserting when
the temperature is below the threshold.
These devices provide an analog output proportional to
temperature and are stable with any capacitive load up
to 1000pF. The MAX6516–MAX6519 can be used over a
range of -35°C to +125°C 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 MAX6516 and MAX6518 have an active-high,
push-pull output. The MAX6517 and MAX6519 have an
active-low, open-drain output. These devices are avail-
able in a space-saving 5-pin SOT23 package and oper-
ate over the -55°C to +125°C temperature range.
Applications
FeaturesHigh Accuracy ±1.5°C (max) Over -15°C to +65°C
Temperature RangeLow Power Consumption—22µA Typical CurrentFactory-Programmed Thresholds from -45°C to
+115°C in 10°C IncrementsAnalog Output to Allow Board-Level TestingOpen-Drain or Push-Pull OutputsPin-Selectable 2°C or 10°C Hysteresis
MAX6516–MAX6519
Low-Cost, 2.7V to 5.5V, Analog Temperature
Sensor Switches in a SOT23
Ordering Information
MAX6517
VCC
GND
MICROCONTROLLER
INT
ADC IN
VCC
VCC
GNDHYST
OUT
TOVER
0.1μF
100kΩ
Typical Operating Circuit
19-3007; Rev 1; 2/11
PARTTEMP RANGEPIN-PACKAGE
MAX6516UK_ _ _ _+T-55°C to +125°C 5 SOT23
MAX6517UK_ _ _ _+T-55°C to +125°C 5 SOT23
MAX6518UK_ _ _ _+T-55°C to +125°C 5 SOT23
MAX6519UK_ _ _ _+T-55°C to +125°C 5 SOT23
GND
VCCHYSTOUT
(MAX6516)
MAX6517
SOT23
TOP VIEW
(TOVER)
TOVER
GND
VCCHYSTOUT
(MAX6516)
MAX6517
SOT23
(TUNDER)
TUNDER
GND
VCCOUTHYST
(MAX6518)
MAX6519
SOT23
(TOVER)
TOVER
GND
VCCOUTHYST
(MAX6518)
MAX6519
SOT23
(TUNDER)
TUNDER
Pin ConfigurationsFan Control
Test Equipment
Temperature Control
Temperature Alarms
Over/Undertemperature
Protection
Notebook, Desktop PCs
RAID
Servers
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 MAX6516UKP065+T describes a
MAX6516 in a 5-pin SOT23 package with a +65°C threshold.
Contact the factory for pricing and availability.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Functional Diagram appears at end of data sheet.
MAX6516–MAX6519
Low-Cost, 2.7V to 5.5V, Analog Temperature
Sensor Switches in a SOT23
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= +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 MAX6516–MAX6519 are available with internal factory-programmed temperature trip thresholds from -45°C to +115°C
in 10°C increments.
Note 3:VCCmust be greater than 4.5V for a switching threshold of -45°C.
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)
OUT, HYST.................................................-0.3V to (VCC+ 0.3V)
OUT Short to GND.........................................................Indefinite
Continuous Power Dissipation (TA= +70°C)
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 (reflow).......................................+260°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Supply Voltage RangeVCC2.75.5V
Hot-temperature thresholds
(+35°C to +115°C)2240
Supply CurrentICC
Cold-temperature thresholds
(-45°C to +15°C)40
-15°C to +65°C-1.5+1.5
+75°C to +115°C-2.5+2.5Temperature Threshold Accuracy
(Note 2)ΔTTH
-45°C to -25°C (Note 3)-3+3
HYST = VCC2Temperature Threshold
HysteresisTHYSTHYST = GND10°C
VIH0.8 x VCCHYST Input Logic Level (Note 4)VIL0.2 x VCCV
ISOURCE = 500µA, VCC > 2.7V0.8 x VCCLogic Output Voltage High
(Push-Pull)VOHISOURCE = 800µA, VCC > 4.5VVCC - 1.5V
ISINK = 1.2mA, VCC > 2.7V0.3Logic Output Voltage Low
(Push-Pull and Open Drain)VOLISINK = 3.2mA, VCC > 4.5V0.4V
Open-Drain Output Leakage
CurrentVCC = 2.7V, open-drain output = 5.5V10nA
OUT TEMPERATURE SENSITIVITY
-30°C to +125°C, VCC = 2.7V to 5.5V-2+2Error to Equation:
OUT = 1.8015V - 10.62mV(T - 30)
- 1.1µV (T - 30)2-55°C to -30°C (Note 3)-5+2
Sensor Gain-10.62mV/°C
OUT Capacitive Load (Note 4)1000pF
0 < IOUT < 40µA0.24OUT Load Regulation-1µA < IOUT < 00.02°C
OUT Line Regulation0.040.3°C/V
MAX6516–MAX6519
Low-Cost, 2.7V to 5.5V, Analog Temperature
Sensor Switches in a SOT23
TRIP-THRESHOLD ACCURACY
MAX6516 toc01
ACCURACY (°C)
PERCENTAGE OF PARTS SAMPLED (%)
TO 0.75
TO 0.25
TO -0.5
TO -1.0
TO -1.5
TO 1.25
SAMPLE SIZE = 147
OUTPUT VOLTAGE vs. TEMPERATURE
MAX6516 toc02
TEMPERATURE (°C)
OUT
(V)
TEMPERATURE ERROR
vs. TEMPERATURE
MAX6516 toc03
TEMPERATURE (°C)
TEMPERATURE ERROR (
°C)
SUPPLY CURRENT vs. TEMPERATURE
MAX6516 toc04
TEMPERATURE (°C)
SUPPLY CURRENT (
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
MAX6516 toc05
SUPPLY VOLTAGE (V)
OUT
(V)
TA = +30°C
TOVER/TUNDER OUTPUT VOLTAGE HIGH
vs. SOURCE CURRENT
MAX6516 toc06
ISINK (mA)
(V)87654321
TOVER/TUNDER OUTPUT VOLTAGE LOW
vs. SOURCE CURRENT
MAX6516 toc07
ISINK (mA)
(V)87654321
THERMAL STEP RESPONSE IN
PERFLOURINATED FLUID
MAX6516 toc08
+25°C
+18.5°C/div
+100°C
2s/div
THERMAL STEP RESPONSE IN
STILL AIR
MAX6516 toc09
+25°C
+18.5°C/div
+100°C
10s/div
Typical Operating Characteristics
(VCC= 5V, TA = +25°C, unless otherwise noted.)
MAX6516–MAX6519
Low-Cost, 2.7V to 5.5V, Analog Temperature
Sensor Switches in a SOT23
Pin Description
STARTUP AND POWER-DOWN
(TEMP < TTH)
MAX6516 toc10
VCC (5V/div)
TOVER (5V/div)
VOUT (5V/div)
200μs/div
MAX6516 toc11
STARTUP DELAY
(TEMP > TTH)
VCC (5V/div)
TOVER (5V/div)
VOUT (5V/div)
200μs/div
Typical Operating Characteristics(continued)
(VCC= 5V, TA = +25°C, unless otherwise noted.)
PIN
MAX6516MAX6517MAX6518MAX6519NAMEFUNCTION133OUTAnalog Output. Voltage represents the die’s temperature.222GNDGround311HYSTHysteresis 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
Push-Pull Active-High Output (Hot Threshold). TOVER goes high when
the die temperature exceeds the factory-programmed hot temperature
threshold.
—5—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. May 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.
—5—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. May be
pulled up to a voltage higher than VCC.
Detailed Description
The MAX6516–MAX6519 fully integrated temperature
switches incorporate a fixed reference, an analog tem-
perature sensor, and a comparator. The temperature at
which the two reference voltages are equal determines
the temperature trip point. OUT is an analog voltage
that varies with the die’s temperature. Pin-selectable
2°C or 10°C hysteresis keeps the digital output from
oscillating when the die temperature approaches the
threshold temperature. The MAX6516 and MAX6518
have an active-high, push-pull output structure that can
sink or source current. The MAX6517 and MAX6519
have an active-low, open-drain output structure that
can only sink current. The internal power-on reset cir-
cuit guarantees the logic output is at its +25°C state for
at least 50µs.
Analog Output
OUT is an analog output that is proportional to the die
temperature. OUT voltage range is between 0.77V to
2.59V, within the temperature range of -45°C to
+125°C. For applications with a switching threshold of
-45°C, the supply voltage must be greater than 4.5V.
The temperature-to-voltage transfer function is approxi-
mately linear and can be described by the quadratic
equation:
VOUT= 1.8015 - 10.62mV (T - 30) + 1.1µV (T - 30)2
where T = temperature in °C.
In most cases, a linear approximation can be applied:
VOUT= 1.8015 - 10.62mV (T - 30)
Therefore,
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
VCCfor 2°C hysteresis or to GND for 10°C hysteresis.
Logic Temperature Indicators
Overtemperature Indicator (Hot Thresholds)
TOVER and TOVERdesignations apply to thresholds
above TA= +25°C (+35°C, +45°C, +55°C, +65°C, +75°C,
+85°C, +95°C, +105°C, +115°C). All “hot” thresholds are
positive temperatures.
The overtemperature indicator output is open-drain
active low (TOVER) or push-pull active high (TOVER).
TOVERgoes 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 TUNDERdesignations 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). TUNDERgoes low when the die tem-
perature goes below the factory-programmed tempera-
ture threshold. TUNDERshould 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.
Applications Information
Temperature-Window Alarm
The MAX6516/MAX6518 logic outputs assert when the
die temperature is outside the factory-programmed
range. Combining the outputs of two devices creates
an over/undertemperature alarm. Two MAX6516s or
two MAX6518s 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. The
MAX6516 push-pull output stages can be ORed to
produce a thermal out-of-range alarm (Figure 1).
More favorably, two MAX6517s or two MAX6519s can
be directly wire-ORed with a single external resistor to
accomplish the same task. The temperature window
alarms shown in Figure 2 can be used to accurately
determine when a device’s temperature falls out of the
-5°C to +75°C range. The thermal overrange signal can
be used to assert a thermal shutdown, power-up,
recalibration, or other temperature-dependent function.VCOUT=+°180150106230.
MAX6516–MAX6519
Low-Cost, 2.7V to 5.5V, Analog Temperature
Sensor Switches in a SOT23
MAX6516–MAX6519
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 MAX6516 and MAX6518
facilitate the use of multiple temperature monitors to
increase system reliability. The application in Figure 3
uses two MAX6516s 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
MAX6516 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.
PC Board Testing
The MAX6516–MAX6519 temp sensor devices can be
tested after PC board assembly using OUT. Testing
can be used to verify proper assembly and functionality
of the temperature protection circuitry. Since OUT has
a weak drive capability, the voltage at OUT can be
forced to cause the digital outputs to change states,
thereby verifying that the internal comparators and out-
put circuitry function properly after assembly. Below is
a test procedure that can be used to test the
MAX6516–MAX6519:Power up the device, measure OUT, and observe the
state of the logic output.
Low-Cost, 2.7V to 5.5V, Analog Temperature
Sensor Switches in a SOT23
MAX6516UKP075
VCC
HYST
GND
TOVER
TUNDER
MAX6516UKN005
VCC
HYST
GND
OVERTEMP
UNDERTEMP
OUT OF RANGE
OUT
OUT
Figure 1. Temperature-Window Alarms Using the MAX6516
MAX6517UKP075MAX6517UKN005
VCC
GND
TUNDER
VCC
GNDHYSTHYST
OUT
TOVER
OUT
100kΩ
OUT OF RANGE
Figure 2. Temperature Window Alarm Using the MAX6517
MAX6516UKP075
GND
HYST
OUT
TOVER
SYSTEM
SHUTDOWNVCC
MAX6516UKP045
GND
OUT
TOVER
FAN CONTROLVCC
HYSTGND
HEAT
HEAT
Figure 3. Low-Power, High-Reliability, Fail-Safe Temperature
Monitor

Partno	Mfg	Dc	Qty	Available	Descript
MAX6517	MAX	N/a	3000	avai	Low-Cost, 2.7V to 5.5V, Analog Temperature Sensor Switches in a SOT23