LM26CIM5 National Semiconductor, LM26CIM5 Datasheet

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LM26CIM5

Manufacturer Part Number
LM26CIM5
Description
Manufacturer
National Semiconductor
Datasheet

Specifications of LM26CIM5

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© 2008 National Semiconductor Corporation
LM26
SOT-23, ±3°C Accurate, Factory Preset Thermostat
General Description
The LM26 is a precision, single digital-output, low-power ther-
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 (T
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 (V
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 T
temperature goes below (T
programmed as an undertemperature shutdown (US) it will
go HIGH to indicate that the temperature is below T
LOW when the temperature is above (T
hysteresis, T
by the state of the HYST pin. A V
a voltage that is proportional to temperature and has a
−10.82mV/°C output slope.
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.
Applications
LM26CIM5-TPA Simplified Block Diagram and Connection Diagram
Microprocessor Thermal Management
Appliances
Portable Battery Powered Systems
TEMP
HYST
). The digital output stage can be preset as ei-
, can be set to 2°C or 10°C and is controlled
please see ordering information or contact National Semiconductor.
OS
–T
TEMP
HYST
OS
For other trip point and output function availability,
The LM26CIM5-TPA has a fixed trip point of 85°C.
). Similarly, when pre-
and go HIGH when the
analog output provides
US
101323
+T
OS
HYST
) can be preset
). The typical
US
and go
Features
Key Specifications
■ 
■ 
■ 
Fan Control
Industrial Process Control
HVAC Systems
Remote Temperature Sensing
Electronic System Protection
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 V
V
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
Power Supply Voltage
Power Supply Current
Hysteresis Temperature
TEMP
output allows after-assembly system testing
Temperature Range
Temperature Trip Point Accuracy
−55°C to +110°C
+120°C
±3°C (max)
±4°C (max)
LM26CIM
TEMP
10132301
2°C or 10°C(typ)
output pin
www.national.com
2.7V to 5.5V
July 31, 2008
40µA(max)
20µA(typ)

LM26CIM5 Summary of contents

Page 1

... Power Supply Voltage ■  Power Supply Current ■  Hysteresis Temperature The LM26CIM5-TPA has a fixed trip point of 85°C. For other trip point and output function availability, 101323 output pin TEMP output allows after-assembly system testing 2°C or 10°C(typ) ...

Page 2

... LM26CIM5-HHD LM26CIM5X-HHD LM26CIM5-NPA LM26CIM5X-NPA LM26CIM5-PHA LM26CIM5X-PHA LM26CIM5-RPA LM26CIM5X-RPA LM26CIM5-SHA LM26CIM5X-SHA LM26CIM5-SPA LM26CIM5X-SPA LM26CIM5-TPA LM26CIM5X-TPA LM26CIM5-VHA LM26CIM5X-VHA LM26CIM5-VPA LM26CIM5X-VPA LM26CIM5-XHA LM26CIM5X-XHA LM26CIM5-XPA LM26CIM5X-XPA LM26CIM5-YHA LM26CIM5X-YHA LM26CIM5-YPA LM26CIM5X-YPA LM26CIM5-ZHA LM26CIM5X-ZHA Connection Diagram Pin Descriptions Pin Pin Number Name 1 HYST Hysteresis control, digital input ...

Page 3

Absolute Maximum Ratings Input Voltage Input Current at any pin (Note 2) Package Input Current(Note 2) Package Dissipation 25°C A  (Note 3) Soldering Information SOT23 Package Vapor Phase (60 seconds) Infrared (15 seconds) LM26 Electrical Characteristics The ...

Page 4

... For example: • the part number LM26CIM5-TPA has T output. • the part number LM26CIM5-FPD has T output. Active-high open-drain and active-low push-pull options are available, please contact National Semiconductor for more information. www.national.com < GND or V > the current at that pin should be limited to 5mA. The 20mA ...

Page 5

... V voltage to cause the digital output to change TEMP 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. 1. Turn and measure V ...

Page 6

TABLE 1. Resistive compensation for capacitive loading of V TEMP C LOAD ≤ 100pF 1nF 10nF 100nF ≥ 1µ series with capacitor series with signal path FIGURE 2. Resistor placement for capacitive loading compensation ...

Page 7

Typical Applications 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 FIGURE 5. ...

Page 8

FIGURE 7. Audio Power Amplifier Thermal Protection FIGURE 8. Simple Thermostat 8 10132322 10132323 ...

Page 9

... 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 www.national.com ...

Page 10

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...