Maxim MAX6515UKN025 Low-cost, 2.7v to 5.5v temperature switches in a sot23 Datasheet

19-3147; Rev 0; 1/04
Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23
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
♦ Low Cost
Ordering Information
TEMP RANGE
PINPACKAGE
MAX6514UK_ _ _ _-T*
-55°C to +125°C
5 SOT23-5
MAX6515UK_ _ _ _-T*
-55°C to +125°C
5 SOT23-5
PART
*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 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.
Typical Operating Circuit
VCC
100kΩ
VCC
VCC
TOVER
Pin Configurations and Functional Diagram appear at end of
data sheet.
0.1µF
INT
MAX6515
MICROCONTROLLER
GND GND HYST
GND
________________________________________________________________ Maxim Integrated Products
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.
1
MAX6514/MAX6515
General Description
MAX6514/MAX6515
Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23
ABSOLUTE MAXIMUM RATINGS
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
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
(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)
PARAMETER
Supply Voltage Range
Supply Current
Temperature Threshold Accuracy
(Note 2)
SYMBOL
CONDITIONS
VCC
ICC
∆TTH
HYST Input Threshold (Note 4)
THYST
TYP
2.7
Hot-temperature thresholds
(+35°C to +115°C)
22
Cold-temperature thresholds
(-45°C to +15°C)
40
Logic Output Voltage Low
(Push-Pull and Open Drain)
VOL
5.5
V
40
-1.5
+1.5
+75°C to +115°C
-2.5
+2.5
-3
2
HYST = GND
10
°C
0.8 x VCC
0.2 x VCC
ISOURCE = 500µA, VCC > 2.7V
0.8 x VCC
ISOURCE = 800µA, VCC > 4.5V
VCC - 1.5
°C
+3
HYST = VCC
VIL
VOH
UNITS
-15°C to +65°C
VIH
Logic Output Voltage High
(Push-Pull)
MAX
µA
-45°C to -25°C (Note 3)
Temperature Threshold
Hysteresis
MIN
V
V
ISINK = 1.2mA, VCC > 2.7V
0.3
ISINK = 3.2mA, VCC > 4.5V
0.4
V
Open-Drain Output Leakage
VCC = 2.7V, open-drain output = 5.5V
10
nA
Current
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.
2
_______________________________________________________________________________________
Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23
TRIP THRESHOLD ACCURACY
40
30
MAX6514 toc02
SAMPLE SIZE = 147
25
SUPPLY CURRENT (µA)
PERCENTAGE OF PARTS SAMPLED (%)
SUPPLY CURRENT
vs. TEMPERATURE
MAX6514 toc01
50
30
20
10
20
15
10
5
0
-1.25 TO -0.75 TO -0.25 TO 0.25 TO 0.75 TO 1.25 TO
-1.0
-0.5
-1.5
0.5
1.0
1.5
0
-55 -35 -15
5
ACCURACY (°C)
TOVER/TUNDER OUTPUT VOLTAGE HIGH
vs. SOURCE CURRENT
45
65
85 105 125
TOVER/TUNDER OUTPUT VOLTAGE LOW
vs. SINK CURRENT
4
MAX6514 toc04
500
MAX6514 toc03
5
400
3
VOL (V)
VOH (V)
25
TEMPERATURE (°C)
300
2
200
1
100
0
0
0
1
2
3
4
5
6
7
8
9
10
0
ISINK (mA)
1
2
3
4
5
6
STARTUP AND POWER-DOWN (TEMP < TTH)
8
9
10
STARTUP DELAY (TEMP > TTH)
MAX6514 toc06
MAX6514 toc05
TIME (400µs/div)
7
ISINK (mA)
VCC
(2V/div)
VCC
(2V/div)
TOVER
(2V/div)
TOVER
(2V/div)
TIME = 100µs
_______________________________________________________________________________________
3
MAX6514/MAX6515
Typical Operating Characteristics
(VCC = 4.5V, TA = +25°C, unless otherwise noted.)
Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23
MAX6514/MAX6515
Pin Description
PIN
NAME
FUNCTION
MAX6514
MAX6515
1, 2
1, 2
GND
3
3
HYST
4
4
VCC
5
—
TOVER
Push-Pull Active-High Output (Hot Threshold). TOVER goes high when the die temperature
exceeds the factory-programmed hot-temperature threshold.
—
5
TOVER
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.
—
5
TUNDER
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.
Ground
Hysteresis Input. Connect to VCC for 2°C of hysteresis or to GND for 10°C hysteresis.
Input Supply. Bypass to ground with a 0.1µF capacitor.
Detailed Description
Logic Temperature Indicators
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.
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, 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.
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
VCC for 2°C hysteresis or to GND for 10°C hysteresis.
4
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.
_______________________________________________________________________________________
Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23
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.
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.
+5V
100kΩ
OUT OF RANGE
VCC
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.
TUNDER
MAX6515UKP075
MAX6515UKN005
GND GND HYST
GND GND HYST
Figure 1. Temperature-Window Alarms Using the MAX6515
+5V
VCC
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:
∆TJ = PDISSIPATION x θJA
where P DISSIPATION is the power dissipated by the
MAX6514/MAX6515, and θJA is the thermal resistance
of the package.
VCC
TOVER
SYSTEM
SHUTDOWN
TOVER
MAX6514UKP075
HEAT
µP
GND GND HYST
VCC
HYST
GND
FAN
CONTROL
TOVER
MAX6514UKP045
HEAT
GND GND
Figure 2. Low-Power, High-Reliability, Fail-Safe Temperature
Monitor
_______________________________________________________________________________________
5
MAX6514/MAX6515
Applications Information
MAX6514/MAX6515
Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23
Table 1. Top Marks
PART
TOP MARK
PART
TOP MARK
MAX6514UKN005
AEKU
MAX6515UKN005
AEMK
AEKV
MAX6515UKN015
AEML
MAX6514UKN025
AEKW
MAX6515UKN025
AEMM
MAX6514UKN035
AECV
MAX6515UKN035
AECX
MAX6514UKN045
AEKX
MAX6515UKN045
AEMN
MAX6514UKP005
AEKY
MAX6515UKP005
AEMO
MAX6514UKP015
AEKZ
MAX6515UKP015
AEMP
MAX6514UKP035
AELA
MAX6515UKP035
AEMQ
MAX6514UKP045
AELB
MAX6515UKP045
AEMR
MAX6514UKP055
AELC
MAX6515UKP055
AEMS
MAX6514UKP065
AELD
MAX6515UKP065
AEMT
MAX6514UKP075
AECW
MAX6515UKP075
AECY
MAX6514UKP085
AELE
MAX6515UKP085
AEMU
MAX6514UKP095
AELF
MAX6515UKP095
AEMV
MAX6514UKP105
AELG
MAX6515UKP105
AEMW
MAX6514UKP115
AELH
MAX6515UKP115
AEMX
MAX6514UKN015
Pin Configurations
TOP VIEW
HOT THRESHOLDS (+35°C TO +115°C)
COLD THRESHOLDS (-45°C TO +15°C)
GND
GND 1
1
GND 2
5
(MAX6514)
MAX6515
HYST 3
GND 2
4
SOT23
6
(TOVER)
TOVER
VCC
5
(TUNDER)
TUNDER
4
VCC
(MAX6514)
MAX6515
HYST 3
SOT23
_______________________________________________________________________________________
Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23
V
MAX6514 (HOT THRESHOLD)
TOVER
TOVER
NEGATIVE
TEMPCO
SENSOR
MAX6514
FIXED
REFERENCE
HYST
NETWORK
HYST
COLD
+25°C
HOT
TEMP
MAX6515 (HOT THRESHOLD)
WITH 100kΩ PULLUP
V
TOVER
TTH
TOVER
NEGATIVE
TEMPCO
SENSOR
MAX6515
FIXED
REFERENCE
HYST
NETWORK
HYST
COLD
+25°C
V
HOT
TEMP
MAX6514 (COLD THRESHOLD)
TUNDER
TUNDER
NEGATIVE
TEMPCO
SENSOR
MAX6514
TTH
FIXED
REFERENCE
HYST
NETWORK
HYST
COLD
HOT
TEMP
MAX6515 (COLD THRESHOLD)
WITH 100kΩ PULLUP
V
TUNDER
+25°C
TTH
TUNDER
NEGATIVE
TEMPCO
SENSOR
MAX6515
FIXED
REFERENCE
HYST
NETWORK
HYST
COLD
TTH
+25°C
HOT
TEMP
Chip Information
TRANSISTOR COUNT: 1808
PROCESS: BiCMOS
_______________________________________________________________________________________
7
MAX6514/MAX6515
MAX6514/MAX6515 Functional Diagram
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
SOT-23 5L .EPS
MAX6514/MAX6515
Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23
PACKAGE OUTLINE, SOT-23, 5L
21-0057
E
1
1
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.
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© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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