概述
数据手册
替代型号LM26CIM5X-YHA 概述
Accurate, Factory Preset Thermostat 准确，出厂预设温控器
LM26CIM5X-YHA 数据手册
通过下载LM26CIM5X-YHA数据手册来全面了解它。这个PDF文档包含了所有必要的细节，如产品概述、功能特性、引脚定义、引脚排列图等信息。
PDF下载March 2005
LM26
SOT-23, 3˚C Accurate, Factory Preset Thermostat
n Portable Battery Powered Systems
n Fan Control
The LM26 is a precision, single digital-output, low-power
n Industrial Process Control
General Description
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
n HVAC Systems
n Remote Temperature Sensing
n Electronic System Protection
)
can be preset at the factory to any temperature in the range
of −55˚C to +110˚C in 1˚C increments. The LM26 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 −10.82mV/˚C output slope.
Features
n Internal comparator with pin programmable 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
2.7V to 5.5V
40µA(max)
j
Power Supply Current
20µA(typ)
Available parts are detailed in the ordering information. For
other part options, contact a National Semiconductor Dis-
tributor or Sales Representative for information on minimum
order qualification. The LM26 is currently available in a
5-lead SOT-23 package.
j
Hysteresis Temperature
2˚C or 10˚C(typ)
Temperature Trip Point Accuracy
Temperature Range
−55˚C to +110˚C
+120˚C
LM26CIM
3˚C (max)
4˚C (max)
Applications
n Microprocessor Thermal Management
n Appliances
LM26CIM5-TPA Simplified Block Diagram and Connection Diagram
10132301
The LM26CIM5-TPA has a fixed trip point of 85˚C.
For other trip point and output function availability,
please see ordering information or contact National Semiconductor.
© 2005 National Semiconductor Corporation
DS101323
www.national.com
Ordering Information
For more detailed information on the suffix meaning see the part number template at the end of the Electrical Characteris-
tics Section. Contact National Semiconductor for other set points and output options.
Order Number
Bulk Rail
NS Package
Number
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
3000 Units in Tape & Reel
LM26CIM5X-NPA
LM26CIM5X-PHA
LM26CIM5X-RPA
LM26CIM5X-SHA
LM26CIM5X-SPA
LM26CIM5X-TPA
LM26CIM5X-VHA
LM26CIM5X-VPA
LM26CIM5X-XHA
LM26CIM5X-XPA
LM26CIM5X-YHA
LM26CIM5X-YPA
LM26CIM5X-ZHA
Top Mark
TNPA
TPHA
TRPA
TSHA
TSPA
TTPA
TVHA
TVPA
TXHA
TXPA
TYHA
TYPA
TZHA
Trip Point Setting Output Function
LM26CIM5-NPA
LM26CIM5-PHA
LM26CIM5-RPA
LM26CIM5-SHA
LM26CIM5-SPA
LM26CIM5-TPA
LM26CIM5-VHA
LM26CIM5-VPA
LM26CIM5-XHA
LM26CIM5-XPA
LM26CIM5-YHA
LM26CIM5-YPA
LM26CIM5-ZHA
45˚C
50˚C
Open Drain OS
Open Drain OS
Open Drain OS
Open Drain OS
Open Drain OS
Open Drain OS
Open Drain OS
Open Drain OS
Open Drain OS
Open Drain OS
Open Drain OS
Open Drain OS
Open Drain OS
65˚C
70˚C
75˚C
85˚C
90˚C
95˚C
100˚C
105˚C
110˚C
115˚C
120˚C
Connection Diagram
10132302
Pin Description
Pin
Pin
Function
Connection
Number
Name
HYST
GND
1
2
Hysteresis control, digital input
Ground, connected to the back side of
the die through lead frame.
Analog output voltage proportional to
temperature
GND for 10˚C or V+ for 2˚C
System GND
3
4
VTEMP
V+
Leave floating or connect to a high impedance
node.
Supply input
2.7V to 5.5V with a 0.1µF bypass capacitor. For
PSRR information see Section Titled NOISE
CONSIDERATIONS.
5
OS
OS
US
US
Overtemperature Shutdown open-drain
active low thermostat digital output
Overtemperature Shutdown push-pull
active high thermostat digital output
Undertemperature Shutdown open-drain
active low thermostat digital output
Undertemperature Shutdown push-pull
active high thermostat digital output
Controller interrupt, system or power supply
shutdown; pull-up resistor ≥ 10kΩ
Controller interrupt, system or power supply
shutdown
System or power supply shutdown; pull-up
resistor ≥ 10kΩ
System or power supply shutdown
Note: pin 5 functionality and trip point setting are programmed during LM26 manufacture.
www.national.com
2
Absolute Maximum Ratings (Note 1)
ESD Susceptibility (Note 4)
Human Body Model
Machine Model
2500V
250V
Input Voltage
6.0V
Input Current at any pin (Note 2)
Package Input Current(Note 2)
Package Dissipation at TA = 25˚C
(Note 3)
5mA
20mA
Operating Ratings(Note 1)
Specified Temperature Range
500mW
TMIN ≤ TA ≤ TMAX
−55˚C ≤ TA ≤ +125˚C
+2.7V to +5.5V
+5.5V
Soldering Information
SOT23 Package
LM26CIM
Positive Supply Voltage (V+)
Maximum VOUT
Vapor Phase (60 seconds)
Infrared (15 seconds)
Storage Temperature
215˚C
220˚C
−65˚C to + 150˚C
LM26 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
LM26CIM
Limits
Units
Symbol
Parameter
Conditions
(Note 6)
(Limits)
(Note 7)
Temperature Sensor
Trip Point Accuracy (Includes
REF, DAC, Comparator Offset,
-55˚C ≤ TA ≤ +110˚C
3
4
˚C (max)
˚C (max)
V
and Temperature Sensitivity
errors)
+120˚C
Trip Point Hysteresis
HYST = GND
HYST = V+
11
2
˚C
˚C
VTEMP Output Temperature
Sensitivity
−10.82
mV/˚C
VTEMP Temperature Sensitivity
Error to Equation:
−30˚C ≤ TA ≤ 120˚C,
2.7V ≤ V+ ≤ 5.5V
−55˚C ≤ TA ≤ 120˚C,
4.5V ≤ V+ ≤ 5.5V
TA = 30˚C
3
3
˚C (max)
VO = (−3.479x10−6x(T−30)2)
˚C (max)
+
(−1.082x10−2x(T−30))
+
1.8015V
2.5
0.7
˚C (max)
mV
VTEMP Load Regulation
−1µA ≤ IL ≤ 0
0.070
−0.2
0 ≤ IL ≤ +40µA
+2.7V ≤ V+ ≤ +5.5V,
mV (max)
mV/V
VTEMP Line Regulation
Supply Current
−30˚C ≤ TA
≤
+120˚C
IS
16
20
µA (max)
µA (max)
40
Digital Output and Input
IOUT(“1”)
Logical “1” Output Leakage
V+ = +5.0V
0.001
1
µA (max)
V (max)
Current (Note 9)
VOUT(“0”)
Logical “0” Output Voltage
IOUT = +1.2mA and
V+≥2.7V;
0.4
IOUT = +3.2mA and
V+≥4.5V; (Note 8)
ISOURCE = 500µA,
V+ ≥ 2.7V
VOUT(“1”)
Logical “1” Push-Pull Output
Voltage
0.8 x V+
V+ − 1.5
0.8 x V+
0.2 x V+
V (min)
V (min)
V (min)
V (max)
ISOURCE = 800µA,
V+≥4.5V
VIH
VIL
HYST Input Logical ”1“ Threshold
Voltage
HYST Input Logical ”0“ Threshold
Voltage
3
www.national.com
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.
+
<
>
V ), the current at that pin should be limited to 5mA. The 20mA
Note 2: When the input voltage (V ) at any pin exceeds the power supply (V
GND or V
I
I
I
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 T
(maximum junction temperature), θ (junction to
JA
Jmax
ambient thermal resistance) and T (ambient temperature). The maximum allowable power dissipation at any temperature is P = (T
–T )/θ or the number
A
D
Jmax
A JA
given in the Absolute Maximum Ratings, whichever is lower. For this device, T
= 150˚C. For this device the typical thermal resistance (θ ) of the different
Jmax
JA
package types when board mounted follow:
Package Type
θJA
SOT23-5, MA05B
250˚C/W
Note 4: The human body model is a 100pF capacitor discharge through a 1.5kΩ resistor 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 T = T = 25˚C and represent most likely parametric norm.
J
A
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 LM26 would increase
by 1.28mW when I
=3.2mA and V
=0.4V. With a thermal resistance of 250˚C/W, this power dissipation would cause an increase in the die temperature of
OUT
OUT
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 LM26CIM-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)
Temperature (˚C)
x (10x)
y (1x)
Temperature (˚C)
A
B
C
D
E
F
H
J
-
-
−5
−4
−3
−2
−1
−0
0
N
P
R
S
T
V
X
Y
Z
N
P
R
S
T
V
-
4
5
-
6
-
7
-
8
-
9
H
J
K
L
10
11
12
1
-
K
L
2
-
3
The value of z describes the assignment/function of the output as shown in the following table:
Open-Drain/
Active-Low/High
Push-Pull
OS/US
Value of z
Digital Output Function
0
0
1
1
0
0
1
1
0
1
0
1
A
B
C
D
Active-Low, Open-Drain, OS output
Active-Low, Open-Drain, US output
Active-High, Push-Pull, OS output
Active-High, Push-Pull, US output
For example:
•
the part number LM26CIM5-TPA has TOS = 85˚C, and programmed as an active-low open-drain overtemperature shutdown
output.
•
the part number LM26CIM5-FPD has TUS = −5˚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.
www.national.com
4
Functional Description
LM26 OPTIONS
10132312
10132313
LM26-_ _A
LM26-_ _B
10132314
10132315
LM26-_ _C
LM26-_ _D
FIGURE 1. Output Pin Options Block Diagrams
The LM26 can be factory programmed to have a trip point
anywhere in the range of −55˚C to +110˚C.
3.
4.
5.
A. Observe that OS is high.
B. Drive VTEMP to ground.
Applications Hints
C. Observe that OS is now low.
D. Release the VTEMP pin.
E. Observe that OS is now high.
AFTER-ASSEMBLY PCB TESTING
The LM26’s VTEMP output allows after-assembly PCB testing
by following a simple test procedure. Simply measuring the
VTEMP output voltage will verify that the LM26 has been
assembled properly and that its temperature sensing cir-
cuitry is functional. The VTEMP output has very weak drive
capability that can be overdriven by 1.5mA. Therefore, one
can simply force the VTEMP voltage to cause the digital
output to change state, thereby verifying that the comparator
and output circuitry function after assembly. Here is a
sample test procedure that can be used to test the
LM26CIM5-TPA which has an 85˚C trip point.
A. Observe that OS is high.
B. Drive VTEMP voltage down gradually.
C. When OS goes low, note the VTEMP voltage.
>
D. VTEMPTrig = VTEMP at OS trigger (HIGH- LOW)
E. Calculate Ttrig using Equation (2).
A. Gradually raise VTEMP until OS goes HIGH. Note
VTEMP
.
1. Turn on V+ and measure VTEMP. Then calculate the
temperature reading of the LM26 using the equation:
B. Calculate THYST using Equation (2).
VO = (−3.479x10−6x(T−30)2) + (−1.082x10−2x(T−30)) +
VTEMP LOADING
1.8015V
(1)
The VTEMP output has very weak drive capability (40µA
source, 1µA sink). So care should be taken when attaching
circuitry to this pin. Capacitive loading may cause the VTEMP
output to oscillate. Simply adding a resistor in series as
shown in Figure 2 will prevent oscillations from occurring. To
determine the value of the resistor follow the guidelines
given in Table 1. The same value resistor will work for either
placement of the resistor. If an additional capacitive load is
placed directly on the LM26 output, rather than across
CLOAD, it should be at least a factor of 10 smaller than
or
(2)
2. Verify that the temperature measured in step one is
within ( 3˚C + error of reference temperature sensor) of
the ambient/board temperature. The ambient/board tem-
perature (reference temperature) should be measured
using an extremely accurate calibrated temperature sen-
sor.
CLOAD
.
5
www.national.com
This presumes that the ambient air temperature is almost the
same as the surface temperature; if the air temperature were
much higher or lower than the surface temperature, the
actual temperature measured would be at an intermediate
temperature between the surface temperature and the air
temperature.
Applications Hints (Continued)
TABLE 1. Resistive compensation for capacitive
loading of VTEMP
CLOAD
≤100pF
1nF
R (Ω)
0
To ensure good thermal conductivity, the backside of the
LM26 die is directly attached to the GND pin (pin 2). The
temperatures of the lands and traces to the other leads of the
LM26 will also affect the temperature that is being sensed.
8200
3000
1000
430
10nF
100nF
≥1µF
Alternatively, the LM26 can be mounted inside a sealed-end
metal tube, and can then be dipped into a bath or screwed
into a threaded hole in a tank. As with any IC, the LM26 and
accompanying wiring and circuits must be kept insulated and
dry, to avoid leakage and corrosion. This is especially true if
the circuit may operate at cold temperatures where conden-
sation can occur. Printed-circuit coatings and varnishes such
as Humiseal and epoxy paints or dips are often used to
ensure that moisture cannot corrode the LM26 or its connec-
tions.
The junction to ambient thermal resistance (θJA) is the pa-
rameter used to calculate the rise of a part’s junction tem-
perature due to its power dissipation. For the LM26 the
equation used to calculate the rise in the die junction tem-
perature is as follows:
10132317
a) R in series with capacitor
(3)
where TA is the ambient temperature, V+ is the power supply
voltage, IQ is the quiescent current, IL_TEMP is the load
current on the VTEMP output, VDO is the voltage on the digital
output, and IDO is the load current on the digital output. Since
the LM26’s junction temperature is the actual temperature
being measured, care should be taken to minimize the load
current that the LM26 is required to drive.
The tables shown in Figure 3 summarize the thermal resis-
tance for different conditions and the rise in die temperature
of the LM26 without any loading on VTEMP and a 10k pull-up
resistor on an open-drain digital output with a 5.5V power
supply.
10132318
b) R in series with signal path
FIGURE 2. Resistor placement for capacitive loading
compensation of VTEMP
SOT23-5
SOT23-5
no heat sink
small heat sink
θJA
(˚C/W)
250
TJ−TA
θJA
(˚C/W)
TBD
TJ−TA
(˚C)
NOISE CONSIDERATIONS
(˚C)
0.11
TBD
The LM26 has excellent power supply noise rejection. Listed
below is a variety of signals used to test the LM26 power
supply rejection. False triggering of the output was not ob-
served when these signals where coupled into the V+ pin of
the LM26.
Still Air
TBD
TBD
Moving Air
TBD
TBD
FIGURE 3. Thermal resistance (θJA) and temperature
rise due to self heating (TJ−TA)
•
•
•
square wave 400kHz, 1Vp-p
square wave 2kHz, 200mVp-p
sine wave 100Hz to 1MHz, 200mVp-p
Testing was done while maintaining the temperature of the
LM26 one degree centigrade way from the trip point with the
output not activated.
MOUNTING CONSIDERATIONS
The LM26 can be applied easily in the same way as other
integrated-circuit temperature sensors. It can be glued or
cemented to a surface. The temperature that the LM26 is
sensing will be within about +0.06˚C of the surface tempera-
ture to which the LM26’s leads are attached to.
www.national.com
6
Typical Applications
10132303
Note: The fan’s control pin has internal pull-up. The 10k pull-down sets a slow fan speed. When the output of the LM26 goes low, the fan will speed up.
FIGURE 4. Two Speed Fan Speed Control
10132320
FIGURE 5. Fan High Side Drive
10132321
FIGURE 6. Fan Low Side Drive
7
www.national.com
Typical Applications (Continued)
10132322
FIGURE 7. Audio Power Amplifier Thermal Protection
10132323
FIGURE 8. Simple Thermostat
www.national.com
8
Physical Dimensions inches (millimeters) unless otherwise noted
5-Lead Molded SOT-23 Plastic Package, JEDEC
Order Number LM26CIM5 or LM26CIM5X
NS Package Number MA05B
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
BANNED SUBSTANCE COMPLIANCE
National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products
Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain
no ‘‘Banned Substances’’ as defined in CSP-9-111S2.
National Semiconductor
Americas Customer
Support Center
National Semiconductor
Europe Customer Support Center
Fax: +49 (0) 180-530 85 86
National Semiconductor
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Support Center
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Email: new.feedback@nsc.com
Tel: 1-800-272-9959
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Deutsch Tel: +49 (0) 69 9508 6208
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Français Tel: +33 (0) 1 41 91 8790
Email: ap.support@nsc.com
Email: jpn.feedback@nsc.com
Tel: 81-3-5639-7560
www.national.com
LM26CIM5X-YHA 替代型号
| 型号 | 制造商 | 描述 | 替代类型 | 文档 |
| LM26CIM5X-YHA/NOPB | TI | Accurate, Factory-Preset Thermostat | 功能相似 |
|
LM26CIM5X-YHA 相关器件
| 型号 | 制造商 | 描述 | 价格 | 文档 |
| LM26CIM5X-YHA/NOPB | ROCHESTER | DIGITAL TEMP SENSOR-SINGLE TRIP POINT, 3Cel, RECTANGULAR, SURFACE MOUNT, PLASTIC, SOT-23, 5 PIN | 获取价格 |
|
| LM26CIM5X-YHA/NOPB | TI | Accurate, Factory-Preset Thermostat | 获取价格 |
|
| LM26CIM5X-YPA | NSC | Accurate, Factory Preset Thermostat | 获取价格 |
|
| LM26CIM5X-YPA | TI | SOT-23, ?3?C Accurate, Factory Preset Thermostat 5-SOT-23 -55 to 125 | 获取价格 |
|
| LM26CIM5X-YPA/NOPB | TI | Accurate, Factory-Preset Thermostat | 获取价格 |
|
| LM26CIM5X-ZHA | NSC | Accurate, Factory Preset Thermostat | 获取价格 |
|
| LM26CIM5X-ZHA/NOPB | TI | Accurate, Factory-Preset Thermostat | 获取价格 |
|
| LM26LV | NSC | 1.6 V, LLP-6 Factory Preset Temperature Switch and Temperature Sensor | 获取价格 |
|
| LM26LV | TI | The LM26LV/LM26LV-Q1 is a low-voltage, precision, dual-output, low-power temperature switch and temperature sensor. | 获取价格 |
|
| LM26LV-Q1 | TI | 汽车级、±3°C、1.6V-5.5V、出厂预设跳变点温度开关 | 获取价格 |
|
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