19-3007; Rev 0; 11/03
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.
Features
o
High Accuracy ±1.5°C (max) Over -15°C to +65°C
Temperature Range
o
Low Power Consumption—22µA Typical Current
o
Factory-Programmed Thresholds from -45°C to
+115°C in 10°C Increments
o
Analog Output to Allow Board-Level Testing
o
Open-Drain or Push-Pull Outputs
o
Pin-Selectable 2°C or 10°C Hysteresis
o
Low Cost
MAX6516–MAX6519
Ordering Information
PART
MAX6516UK_
_ _ _-T
MAX6517UK_
_ _ _-T
MAX6518UK_
_ _ _-T
MAX6519UK_
_ _ _-T
TEMP RANGE
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
PIN-PACKAGE
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
*These
parts are offered in 16 standard temperature versions
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 MAX6516UKP065-T describes a MAX6516 in a
5-pin SOT23 package with a +65°C threshold. Contact the facto-
ry for pricing and availability.
Functional Diagram appears at end of data sheet.
Applications
Fan Control
Test Equipment
Temperature Control
Temperature Alarms
Over/Undertemperature
Protection
Notebook, Desktop PCs
RAID
Servers
OUT
1
5
Pin Configurations
TOP VIEW
(TOVER)
TOVER
(TUNDER)
TUNDER
OUT
1
5
GND
2
(MAX6516)
MAX6517
4
V
CC
GND
2
(MAX6516)
MAX6517
4
V
CC
Typical Operating Circuit
HYST
3
HYST
3
V
CC
100kΩ
V
CC
V
CC
0.1µF
TOVER
INT
MICROCONTROLLER
GND
2
HYST
1
5
(TOVER)
TOVER
HYST
1
5
(TUNDER)
TUNDER
SOT23
SOT23
MAX6517
OUT
GND
HYST
(MAX6518)
MAX6519
4
V
CC
GND
2
(MAX6518)
MAX6519
4
V
CC
ADC IN
GND
OUT
3
OUT
3
SOT23
SOT23
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Low-Cost, 2.7V to 5.5V, Analog Temperature
Sensor Switches in a SOT23
MAX6516–MAX6519
ABSOLUTE MAXIMUM RATINGS
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)
OUT, HYST .................................................-0.3V to (V
CC
+ 0.3V)
OUT Short to GND .........................................................Indefinite
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
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
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= 2.7V to 5.5V, R
PULLUP
= 100kΩ (open-drain output only), T
A
= -55°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
SYMBOL
V
CC
Hot-temperature thresholds
(+35°C to +115°C)
Supply Current
I
CC
Cold-temperature thresholds
(-45°C to +15°C)
-15°C to +65°C
Temperature Threshold Accuracy
(Note 2)
Temperature Threshold
Hysteresis
HYST Input Logic Level (Note 4)
Logic Output Voltage High
(Push-Pull)
Logic Output Voltage Low
(Push-Pull and Open Drain)
Open-Drain Output Leakage
Current
OUT TEMPERATURE SENSITIVITY
Error to Equation:
OUT = 1.8015V - 10.62mV(T - 30)
- 1.1µV (T - 30)
2
Sensor Gain
OUT Capacitive Load (Note 4)
OUT Load Regulation
OUT Line Regulation
0 < I
OUT
< 40µA
-1µA < I
OUT
< 0
0.02
0.04
0.3
-30°C to +125°C, V
CC
= 2.7V to 5.5V
-55°C to -30°C (Note 3)
-2
-5
-10.62
1000
0.24
+2
+2
°C
mV/°C
pF
°C
°C/V
∆T
TH
+75°C to +115°C
-45°C to -25°C (Note 3)
T
HYST
V
IH
V
IL
V
OH
V
OL
I
SOURCE
= 500µA, V
CC
> 2.7V
I
SOURCE
= 800µA, V
CC
> 4.5V
I
SINK
= 1.2mA, V
CC
> 2.7V
I
SINK
= 3.2mA, V
CC
> 4.5V
V
CC
= 2.7V, open-drain output = 5.5V
10
0.8 x V
CC
V
CC
- 1.5
0.3
0.4
HYST = V
CC
HYST = GND
0.8 x V
CC
0.2 x V
CC
-1.5
-2.5
-3
2
10
CONDITIONS
MIN
2.7
22
40
+1.5
+2.5
+3
°C
V
V
V
nA
°C
TYP
MAX
5.5
40
µA
UNITS
V
Note 1:
100% production tested at T
A
= +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:
V
CC
must be greater than 4.5V for a switching threshold of -45°C.
Note 4:
Guaranteed by design.
2
_______________________________________________________________________________________
Low-Cost, 2.7V to 5.5V, Analog Temperature
Sensor Switches in a SOT23
Typical Operating Characteristics
(V
CC
= 5V, T
A
= +25°C, unless otherwise noted.)
TEMPERATURE ERROR
vs. TEMPERATURE
MAX6516 toc02
MAX6516 toc03
MAX6516–MAX6519
TRIP-THRESHOLD ACCURACY
PERCENTAGE OF PARTS SAMPLED (%)
SAMPLE SIZE = 147
40
MAX6516 toc01
OUTPUT VOLTAGE vs. TEMPERATURE
2.75
2.50
2.25
2.00
V
OUT
(V)
2
50
TEMPERATURE ERROR (°C)
-55 -35 -15
5
25
45
65
85 105 125
1
30
1.75
1.50
1.25
0
20
10
1.00
0.75
-1
0
1.0
-1.25 -0.75 -0.25
0
0.5
TO -1.5 TO -1.0 TO -0.5 TO 0.25 TO 0.75 TO 1.25
ACCURACY (°C)
0.50
TEMPERATURE (°C)
-2
-55 -35 -15
5
25
45
65
85 105 125
TEMPERATURE (°C)
SUPPLY CURRENT vs. TEMPERATURE
MAX6516 toc04
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
MAX6516 toc05
TOVER/TUNDER OUTPUT VOLTAGE HIGH
vs. SOURCE CURRENT
MAX6516 toc06
30
25
SUPPLY CURRENT (µA)
20
1.8300
1.8250
1.8200
1.8150
V
OUT
(V)
T
A
= +30°C
5
4
15
10
5
0
-55 -35 -15
5
25
45
65
85 105 125
TEMPERATURE (°C)
1.8050
1.8000
1.7950
1.7900
1.7850
1.7800
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
V
OH
(V)
1.8100
3
2
1
0
0
1
2
3
4
5
6
7
8
9
10
I
SINK
(mA)
TOVER/TUNDER OUTPUT VOLTAGE LOW
vs. SOURCE CURRENT
MAX6516 toc07
THERMAL STEP RESPONSE IN
PERFLOURINATED FLUID
MAX6516 toc08
THERMAL STEP RESPONSE IN
STILL AIR
MAX6516 toc09
500
+25°C
+25°C
+18.5°C/div
+18.5°C/div
400
V
OL
(V)
300
200
+100°C
100
+100°C
0
0
1
2
3
4
5
6
7
8
9
10
2s/div
10s/div
I
SINK
(mA)
_______________________________________________________________________________________
3
Low-Cost, 2.7V to 5.5V, Analog Temperature
Sensor Switches in a SOT23
MAX6516–MAX6519
Typical Operating Characteristics (continued)
(V
CC
= 5V, T
A
= +25°C, unless otherwise noted.)
STARTUP AND POWER-DOWN
(TEMP < T
TH
)
MAX6516 toc10
STARTUP DELAY
(TEMP > T
TH
)
MAX6516 toc11
V
CC
(5V/div)
V
CC
(5V/div)
TOVER (5V/div)
TOVER (5V/div)
V
OUT
(5V/div)
200µs/div
200µs/div
V
OUT
(5V/div)
Pin Description
PIN
MAX6516
1
2
3
4
5
MAX6517
1
2
3
4
—
MAX6518 MAX6519
3
2
1
4
5
3
2
1
4
—
NAME
OUT
GND
HYST
V
CC
TOVER
FUNCTION
Analog Output. Voltage represents the die’s temperature.
Ground
Hysteresis Input. Connect to V
CC
for 2°C of hysteresis or to GND for
10°C hysteresis.
Input Supply. Bypass to ground with a 0.1µF capacitor.
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. May be
pulled up to a voltage higher than V
CC
.
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. May be
pulled up to a voltage higher than V
CC
.
—
5
—
5
TOVER
5
—
5
—
TUNDER
—
5
—
5
TUNDER
4
_______________________________________________________________________________________
Low-Cost, 2.7V to 5.5V, Analog Temperature
Sensor Switches in a SOT23
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.
Logic Temperature Indicators
Overtemperature Indicator (Hot Thresholds)
TOVER and
TOVER
designations apply to thresholds
above T
A
= +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).
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 temper-
ature threshold.
Undertemperature Indicator (Cold Thresholds)
TUNDER and
TUNDER
designations apply to thresholds
below T
A
= +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 tem-
perature goes below the factory-programmed tempera-
ture threshold.
TUNDER
should be pulled up to a
voltage no greater than 5.5V with a 100kΩ pullup 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.
MAX6516–MAX6519
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:
V
OUT
= 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:
V
OUT
= 1.8015 - 10.62mV (T - 30)
Therefore,
T
=
1.8015
−
V
OUT
+
30
°
C
0.01062
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.
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
V
CC
for 2°C hysteresis or to GND for 10°C hysteresis.
_______________________________________________________________________________________
5
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