LM26EVAL-XPA National Semiconductor, LM26EVAL-XPA Datasheet

LM26EVAL-XPA

Manufacturer Part Number

LM26EVAL-XPA

Description

BOARD EVALUATION LM26CIM5-XPA

Manufacturer

National Semiconductor

Series

PowerWise®r

Datasheets

1.LM26EVAL-TPA.pdf (10 pages)

2.LM26EVAL-XPA.pdf (1 pages)

Specifications of LM26EVAL-XPA

Sensor Type

Thermostat

Sensing Range

105°C Trip Point

Interface

Analog

Sensitivity

±3°C

Voltage - Supply

2.7 V ~ 5.5 V

Embedded

Utilized Ic / Part

LM26CIM5-XPA

Lead Free Status / RoHS Status

Not applicable / Not applicable

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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.

–T

TEMP

HYST

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

101323

HYST

) can be preset

). The typical

and go

LM26

■

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

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

September 9, 2009

2°C or 10°C (typ)

output pin

10132301

www.national.com

2.7V to 5.5V

40µA (max)

20µA (typ)

Related parts for LM26EVAL-XPA

LM26EVAL-XPA Summary of contents

Page 1

... 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. ...

Page 2

... 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 3000 Units in Tape & Bulk Rail Reel LM26CIM5-BPB LM26CIM5X-BPB ...

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 ...

Page 4

... 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

Functional Description LM26 OPTIONS LM26-_ _A LM26-_ _C The LM26 can be factory programmed to have a trip point anywhere in the range of −55°C to +110°C. Applications Hints AFTER-ASSEMBLY PCB TESTING The LM26's V output allows after-assembly PCB testing ...

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 and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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