LM26 概述
LM26 SOT-23, /-3C Accurate, Factory Preset Thermostat LM26采用SOT - 23 , / -3C准确,出厂预设温控器
LM26 数据手册
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LM26 SOT-23, +/-3C Accurate, Factory Preset Thermostat
Literature Number: SNIS115Q
September 9, 2009
LM26
SOT-23, ±3°C Accurate, Factory Preset Thermostat
Fan Control
■
■
■
■
■
General Description
Industrial Process Control
The LM26 is a precision, single digital-output, low-power ther-
HVAC Systems
mostat comprised of an internal reference, DAC, temperature
sensor and comparator. Utilizing factory programming, 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 −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 ei-
ther 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 temperature
shutdown event (OS or OS) or an under temperature shut-
down event (US or US). When preset as an overtemperature
shutdown (OS) it will go LOW to indicate that the die temper-
ature is over the internally preset TOS and go HIGH when the
temperature goes below (TOS–THYST). Similarly, when pre-
programmed as an undertemperature shutdown (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.
Remote Temperature Sensing
Electronic System Protection
Features
Internal comparator with pin programmable 2°C or 10°C
■
hysteresis
No external components required
■
■
Open Drain or push-pull digital output; supports CMOS
logic levels
Internal temperature sensor with VTEMP output pin
■
■
■
■
■
■
VTEMP output allows after-assembly system testing
Internal voltage reference and DAC for trip-point setting
Currently available in 5-pin SOT-23 plastic package
Excellent power supply noise rejection
UL Recognized Component
Key Specifications
■ꢀPower Supply Voltage
■ꢀPower Supply Current
2.7V to 5.5V
40µA (max)
20µA (typ)
Available parts are detailed in the ordering information. For
other part options, contact a National Semiconductor Distrib-
utor or Sales Representative for information on minimum
order qualification. The LM26 is currently available in a 5-lead
SOT-23 package.
■ꢀHysteresis Temperature
2°C or 10°C (typ)
Temperature Trip Point Accuracy
Temperature Range
−55°C to +110°C
+120°C
LM26CIM
Applications
±3°C (max)
±4°C (max)
Microprocessor Thermal Management
■
■
Appliances
Portable Battery Powered Systems
■
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.
© 2011 National Semiconductor Corporation
101323
www.national.com
Ordering Information
For more detailed information on the suffix meaning see the part number template at the end of the Electrical Characteristics
Section. Contact National Semiconductor for other set points and output options.
Order Number
Bulk Rail
3000 Units in Tape &
Reel
NS Package
Number
Top Mark
Trip Point Setting
Output Function
LM26CIM5-BPB
LM26CIM5-DPB
LM26CIM5-HHD
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
LM26CIM5X-BPB
LM26CIM5X-DPB
LM26CIM5X-HHD
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
TBPB
TDPB
THHD
TNPA
TPHA
TRPA
TSHA
TSPA
TTPA
TVHA
TVPA
TXHA
TXPA
TYHA
TYPA
TZHA
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
MA05B
−45°C
−25°C
0°C
Open Drain US
Open Drain US
Push Pull US
45°C
50°C
65°C
70°C
75°C
85°C
90°C
95°C
100°C
105°C
110°C
115°C
120°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
Connection Diagram
10132302
Pin Descriptions
Pin
Number
Pin
Name
Function
Connection
Hysteresis control, digital input
GND for 10°C or V+ for 2°C
System GND
1
HYST
Ground, connected to the back side of the die
through lead frame.
2
GND
Analog output voltage proportional to
temperature
VTEMP
V+
3
4
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.
Supply input
Overtemperature Shutdown open-drain active Controller interrupt, system or power supply shutdown; pull-up
OS
OS
low thermostat digital output
resistor ≥ 10kΩ
Overtemperature Shutdown push-pull active
Controller interrupt, system or power supply shutdown
high thermostat digital output
5
US
US
Undertemperature Shutdown open-drain active
low thermostat digital output
System or power supply shutdown; pull-up resistor ≥ 10kΩ
Undertemperature Shutdown push-pull active
System or power supply shutdown
high thermostat digital output
Note: pin 5 functionality and trip point setting are programmed during LM26 manufacture.
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2
Storage Temperature
−65°C to + 150°C
Absolute Maximum Ratings (Note 1)
ESD Susceptibility (Note 4)
Human Body Model
Machine Model
Input Voltage
6.0V
2500V
250V
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
LM26CIM
500mW
TMIN ≤ TA ≤ TMAX
Soldering Information
SOT23 Package
−55°C ≤ TA ≤ +125°C
+2.7V to +5.5V
+5.5V
Positive Supply Voltage (V+)
Maximum VOUT
Vapor Phase (60 seconds)
Infrared (15 seconds)
215°C
220°C
LM26 Electrical Characteristics
The following specifications apply for V+ = 2.7VDC to 5.5VDC, and VTEMP load current = 0µA unless otherwise specified. Boldface
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 VREF, DAC,
Comparator Offset, and Temperature
Sensitivity errors)
±3
±4
°C (max)
°C (max)
-55°C ≤ TA ≤ +110°C
+120°C
HYST = GND
HYST = V+
11
2
°C
°C
Trip Point Hysteresis
VTEMP Output Temperature Sensitivity
−10.82
mV/°C
VTEMP Temperature Sensitivity Error to
Equation:
−30°C ≤ TA ≤ 120°C,
2.7V ≤ V+ ≤ 5.5V
±3
°C (max)
°C (max)
VO = (−3.479×10−6×(T−30)2)
+ (−1.082×10−2×(T−30)) + 1.8015V
−55°C ≤ TA ≤ 120°C,
4.5V ≤ V+ ≤ 5.5V
TA = 30°C
±3
±2.5
°C (max)
mV
0.070
Source ≤ 1 μA
Sink ≤ 40 μA
VTEMP Load Regulation
0.7
mV (max)
+2.7V ≤ V+ ≤ +5.5V,
−30°C ≤ TA ≤ +120°C
VTEMP Line Regulation
Supply Current
−0.2
16
mV/V
20
40
µA (max)
µA (max)
IS
Digital Output and Input
Logical “1” Output Leakage Current
(Note 9)
IOUT(“1”)
V+ = +5.0V
0.001
1
µA (max)
V (max)
IOUT = +1.2mA and
VOUT(“0”)
V+≥2.7V; IOUT = +3.2mA
and V+≥4.5V; (Note 8)
Logical “0” Output Voltage
0.4
ISOURCE = 500µA, V+ ≥
0.8 × V+
V+ − 1.5
V (min)
V (min)
2.7V
VOUT(“1”)
Logical “1” Push-Pull Output Voltage
ISOURCE = 800µA, V
+
≥4.5V
HYST Input Logical ”1“ Threshold
Voltage
VIH
VIL
0.8 × V+
0.2 × V+
V (min)
V (max)
HYST Input Logical ”0“ Threshold
Voltage
3
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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
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 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 LM26 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 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/ Push-
Active-Low/High
OS/US
Value of z
Digital Output Function
Pull
0
0
1
1
0
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
0
1
1
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 information.
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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 as-
sembled properly and that its temperature sensing circuitry 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 cir-
cuitry function after assembly. Here is a sample test proce-
dure 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.
VTEMP LOADING
VO = (−3.479×10−6×(T−30)2) + (−1.082×10−2×(T
The VTEMP output has very weak drive capability (1 µA source,
40 µA 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 re-
sistor. If an additional capacitive load is placed directly on the
LM26 output, rather than across CLOAD, it should be at least
−30)) + 1.8015V
(1)
(2)
or
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
temperature (reference temperature) should be
measured using an extremely accurate calibrated
temperature sensor.
a factor of 10 smaller than CLOAD
.
5
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TABLE 1. Resistive compensation for capacitive loading
of VTEMP
mented to a surface. The temperature that the LM26 is sens-
ing will be within about +0.06°C of the surface temperature to
which the LM26's leads are attached to.
CLOAD
R (Ω)
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 temper-
ature between the surface temperature and the air tempera-
ture.
0
≤100pF
1nF
8200
3000
1000
430
10nF
100nF
≥1µF
To ensure good thermal conductivity, the backside of the
LM26 die is directly attached to the GND pin (pin 2). The tem-
peratures of the lands and traces to the other leads of the
LM26 will also affect the temperature that is being sensed.
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 connections.
10132317
a) R in series with capacitor
The junction to ambient thermal resistance (θJA) is the pa-
rameter used to calculate the rise of a part's junction temper-
ature due to its power dissipation. For the LM26 the equation
used to calculate the rise in the die junction temperature is as
follows:
(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.
10132318
b) R in series with signal path
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.
FIGURE 2. Resistor placement for capacitive loading
compensation of VTEMP
NOISE CONSIDERATIONS
SOT23-5
SOT23-5
The LM26 has excellent power supply noise rejection. Listed
below is a variety of signals used to test the LM26 power sup-
ply rejection. False triggering of the output was not observed
when these signals where coupled into the V+ pin of the
LM26.
no heat sink
small heat sink
TJ−TA
(°C)
TJ−TA
(°C)
θJA
(°C/W)
250
θJA
(°C/W)
TBD
Still Air
0.11
TBD
TBD
TBD
•
•
•
square wave 400kHz, 1Vp-p
square wave 2kHz, 200mVp-p
sine wave 100Hz to 1MHz, 200mVp-p
Moving Air
TBD
TBD
FIGURE 3. Thermal resistance (θJA) and temperature rise
Testing was done while maintaining the temperature of the
LM26 one degree centigrade way from the trip point with the
output not activated.
due to self heating (TJ−TA)
MOUNTING CONSIDERATIONS
The LM26 can be applied easily in the same way as other
integrated-circuit temperature sensors. It can be glued or ce-
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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
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10132322
FIGURE 7. Audio Power Amplifier Thermal Protection
10132323
FIGURE 8. Simple Thermostat
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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
9
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Notes
For more National Semiconductor product information and proven design tools, visit the following Web sites at:
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LM26 替代型号
型号 | 制造商 | 描述 | 替代类型 | 文档 |
LM26LV | TI | The LM26LV/LM26LV-Q1 is a low-voltage, precision, dual-output, low-power temperature switc | 功能相似 | |
LM26LV-Q1 | TI | 汽车级、±3°C、1.6V-5.5V、出厂预设跳变点温度开关 | 功能相似 |
LM26 相关器件
型号 | 制造商 | 描述 | 价格 | 文档 |
LM26001 | NSC | 1.5A Switching Regulator with High Efficiency Sleep MODE | 获取价格 | |
LM26001 | TI | LM26001/-Q1 1.5-A Switching Regulator With High-Efficiency Sleep Mode | 获取价格 | |
LM26001-Q1 | TI | LM26001/-Q1 1.5-A Switching Regulator With High-Efficiency Sleep Mode | 获取价格 | |
LM26001B | NSC | 1.5A Switching Regulator with High Efficiency Sleep Mode | 获取价格 | |
LM26001B | TI | 具有高效睡眠模式的 1.5A 开关稳压器 | 获取价格 | |
LM26001BMH | NSC | 1.5A Switching Regulator with High Efficiency Sleep Mode | 获取价格 | |
LM26001BMH/NOPB | NSC | IC 3.2 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDSO16, ROHS COMPLIANT, PLASTIC, TSSOP-16, Switching Regulator or Controller | 获取价格 | |
LM26001BMH/NOPB | TI | 具有高效睡眠模式的 1.5A 开关稳压器 | PWP | 16 | -40 to 125 | 获取价格 | |
LM26001BMHX | NSC | 1.5A Switching Regulator with High Efficiency Sleep Mode | 获取价格 | |
LM26001BMHX/NOPB | NSC | IC 3.2 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDSO16, ROHS COMPLIANT, PLASTIC, TSSOP-16, Switching Regulator or Controller | 获取价格 |
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