LM27 Datasheet PDF - National Semiconductor

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LM27
National Semiconductor

Part Number LM27
Description Factory Preset Thermostat
Page 10 Pages


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September 2006
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LM27
SOT-23, ±3˚C Accurate, 120˚C-150˚C Factory Preset
Thermostat
General Description
The LM27 is a precision, single digital-output, low-power
thermostat comprised of an internal reference, DAC, tem-
perature sensor and comparator. Utilizing factory program-
ming, it can be manufactured with different trip points as well
as different digital output functionality. The trip point (TOS)
can be preset at the factory to any temperature in the range
of +120˚C to +150˚C in 1˚C increments. The LM27 has one
digital output (OS/OS/US/US), one digital input (HYST) and
one analog output (VTEMP). The digital output stage can be
preset as either open-drain or push-pull. In addition, it can be
factory programmed to be active HIGH or LOW. The digital
output can be factory programmed to indicate an over tem-
perature shutdown event (OS or OS) or an under tempera-
ture shutdown event (US or US). When preset as an over-
temperature shutdown (OS) it will go LOW to indicate that
the die temperature is over the internally preset TOS and go
HIGH when the temperature goes below (TOS–THYST). Simi-
larly, when preprogrammed as an undertemperature shut-
down (US) it will go HIGH to indicate that the temperature is
below TUS and go LOW when the temperature is above
(TUS+THYST). The typical hysteresis, THYST, can be set to
2˚C or 10˚C and is controlled by the state of the HYST pin. A
VTEMP analog output provides a voltage that is proportional
to temperature and has a −10.7mV/˚C output slope.
Currently, there are several standard parts available, see
ordering information for details. For other part options, con-
tact a National Semiconductor Distributor or Sales Repre-
sentative for information on minimum order qualification. The
LM27 is currently available in a 5-lead SOT-23 package.
Applications
n Microprocessor Thermal Management
n Appliances
n Portable Battery Powered Systems
n Fan Control
n Industrial Process Control
n HVAC Systems
n Electronic System Protection
Features
n Internal comparator with pin selectable 2˚C or 10˚C
hysteresis
n No external components required
n Open-drain or push-pull digital output; supports CMOS
logic levels
n Internal temperature sensor with VTEMP output pin
n VTEMP output allows after-assembly system testing
n Internal voltage reference and DAC for trip-point setting
n Currently available in 5-pin SOT-23 plastic package
n Excellent power supply noise rejection
Key Specifications
j Power Supply Voltage
j Power Supply Current
j Hysteresis Temperature
j Temperature Trip Point Accuracy
2.7V to 5.5V
40µA(max)
15µA(typ)
2˚C or 10˚C(typ)
±3˚C (max)
LM27CIM5-2HJ Simplified Block Diagram and Connection Diagram
The LM27CIM5-2HJ has a fixed trip point of 140˚C.
For other trip point and output function availability,
please see ordering information or contact National Semiconductor.
20030701
© 2006 National Semiconductor Corporation DS200307
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Ordering Information
For more detailed information on the suffix meaning see the part number template at the end of the Electrical Charac-
teristics Section. Contact National Semiconductor for other set points and output options.
Order Number
Bulk Rail
3000 Units in Tape
& Reel
Top Mark
NS Package
Number Trip Point Setting Output Function
LM27CIM5-ZHJ
LM27CIM5X-ZHJ
TZHJ
MA05B
120˚C
Open Drain OS
LM27CIM5-1HJ
LM27CIM5X-1HJ
T1HJ
MA05B
130˚C
Open Drain OS
LM27CIM5-2HJ
LM27CIM5X-2HJ
T2HJ
MA05B
140˚C
Open Drain OS
Connection Diagram
20030702
Pin Descriptions
Pin Number
1
2
3
4
5
Pin Name
HYST
GND
VTEMP
V+
OS
OS
US
US
Function
Hysteresis control, digital
input
Ground, connected to the
back side of the die through
lead frame.
Analog output voltage
proportional to temperature
Supply input
Overtemperature Shutdown
open-drain active low
thermostat digital output
Overtemperature Shutdown
totem-pull active high
thermostat digital output
Undertemperature Shutdown
open-drain active low
thermostat digital output
Undertemperature Shutdown
totem-pull active high
thermostat digital output
Connection
GND for 10˚C or V+ for 2˚C
System GND
Leave floating or connect to a high impedance
node.
2.7V to 5.5V with a 0.1µF bypass capacitor.
For PSRR information see Section Titled
NOISE CONSIDERATIONS.
Controller interrupt, system or power supply
shutdown; pull-up resistor 10k
Controller interrupt, system or power supply
shutdown
System or power supply shutdown; pull-up
resistor 10k
System or power supply shutdown
Note: pin 5 functionality and trip point setting are programmed during LM27 manufacture.
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Absolute Maximum Ratings (Note 1)
Input Voltage
Input Current at any pin (Note 2)
Package Input Current(Note 2)
Package Dissipation at TA = 25˚C
(Note 3)
Soldering Information
SOT23 Package
Vapor Phase (60 seconds)
Infrared (15 seconds)
Storage Temperature
6.0V
5mA
20mA
500mW
215˚C
220˚C
−65˚C to + 150˚C
ESD Susceptibility (Note 4)
Human Body Model
Machine Model
2500V
250V
Operating Ratings(Note 1)
Specified Temperature Range
LM27CIM
Positive Supply Voltage (V+)
Maximum VOUT
TMIN TA TMAX
−40˚C TA +150˚C
+2.7V to +5.5V
+5.5V
LM27 Electrical Characteristics
The following specifications apply for V+ = 2.7VDC to 5.5VDC, and VTEMP load current = 0µA unless otherwise specified. Bold-
face limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C unless otherwise specified.
Typical
LM27CIM
Units
Symbol
Parameter
Conditions
(Note 6)
Limits
(Limits)
(Note 7)
Temperature Sensor
Trip Point Accuracy (Includes
VREF, DAC, Comparator Offset,
and Temperature Sensitivity
+120˚C<TA<+150˚C
±3 ˚C (max)
errors)
Trip Point Hysteresis
HYST = GND
10
˚C
HYST = V+
2
˚C
VTEMP Output Temperature
Sensitivity
−10.82
mV/˚C
VTEMP Temperature Sensitivity
Error to Equation:
−30˚C TA 150˚C,
2.7V V+ 5.5V
±3 ˚C (max)
V(−O10=.6(−953x.51502x31x(0T6x3(0T)−)+30)2+
1.8386V
VTEMP Load Regulation
−55˚C TA 150˚C,
4.5V V+ 5.5V
TA = 25˚C
Source 1 µA
Sink 40 µA
0.070
±3
±2.5
0.7
˚C (max)
˚C (max)
mV
mV (max)
VTEMP Line Regulation
IS Supply Current
+2.7V V+ +5.5V,
−30˚C TA +120˚C
−0.2
15
mV/V
22 µA (max)
40 µA (max)
Digital Output and Input
IOUT(“1”)
Logical “1” Output Leakage
Current (Note 9)
V+ = +5.0V
0.001 1 µA (max)
VOUT(“0”)
Logical “0” Output Voltage
IOUT = +1.2mA and
V+2.7V;
0.4 V (max)
IOUT = +3.2mA and
V+4.5V; (Note 8)
VOUT(“1”)
Logical “1” Push-Pull Output
Voltage
ISOURCE = 500µA, V+
2.7V
0.8 x V+
V (min)
ISOURCE = 800µA,
V+4.5V
V+ − 1.5
V (min)
VIH HYST Input Logical ”1“ Threshold
Voltage
0.8 x V+
V (min)
VIL HYST Input Logical ”0“ Threshold
Voltage
0.2 x V+
V (max)
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LM27 Electrical Characteristics (Continued)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: When the input voltage (VI) at any pin exceeds the power supply (VI < GND or VI > V+), the current at that pin should be limited to 5mA. The 20mA
maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5mA to four. Under normal
operating conditions the maximum current that pins 2, 4 or 5 can handle is limited to 5mA each.
Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (junction to
ambient thermal resistance) and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PD = (TJmax–TA)/θJA or the number
given in the Absolute Maximum Ratings, whichever is lower. For this device, TJmax = 150˚C. For this device the typical thermal resistance (θJA) of the different
package types when board mounted follow:
Package Type
SOT23-5, MA05B
θJA
250˚C/W
Note 4: The human body model is a 100pF capacitor discharge through a 1.5kresistor into each pin. The machine model is a 200pF capacitor discharged directly
into each pin.
Note 5: See the URL ”http://www.national.com/packaging/“ for other recommendations and methods of soldering surface mount devices.
Note 6: Typicals are at TJ = TA = 25˚C and represent most likely parametric norm.
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Care should be taken to include the effects of self heating when setting the maximum output load current. The power dissipation of the LM27 would increase
by 1.28mW when IOUT=3.2mA and VOUT=0.4V. With a thermal resistance of 250˚C/W, this power dissipation would cause an increase in the die temperature of about
0.32˚C due to self heating. Self heating is not included in the trip point accuracy specification.
Note 9: The 1µA limit is based on a testing limitation and does not reflect the actual performance of the part. Expect to see a doubling of the current for every 15˚C
increase in temperature. For example, the 1nA typical current at 25˚C would increase to 16nA at 85˚C.
Part Number Template
The series of digits labeled xyz in the part number LM27CIM-xyz, describe the set point value and the function of the output as
follows:
The place holders xy describe the set point temperature as shown in the following table.
x (10x)
-
-
-
-
-
-
-
y (1x)
H
J
K
L
N
P
R
Temperature (˚C)
0
1
2
3
4
5
6
x (10x)
-
-
-
Z
1
2
3
y (1x)
S
T
V
-
-
-
-
Temperature (˚C)
7
8
9
12
13
14
15
The value of z describes the assignment/function of the output as shown in the following table:
Active-Low/High
Open-Drain/
Push-Pull
OS/US
Value of z
Digital Output Function
0 0 0 J Active-Low, Open-Drain, OS output
0 0 1 K Active-Low, Open-Drain, US output
1 1 0 L Active-High, Push-Pull, OS output
1 1 1 N Active-High, Push-Pull, US output
For example:
the part number LM27CIM5-2SJ has TOS = 147˚C, and programmed as an active-low open-drain overtemperature shutdown
output.
the part number LM27CIM5-ZLN has TUS = 123˚C, and programmed as an active-high, push-pull undertemperature shutdown
output.
Active-high open-drain and active-low push-pull options are available, please contact National Semiconductor for more informa-
tion.
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