Datasheet > LM26_07

LM26_07

更新时间： 2024-11-22 05:42:03

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美国国家半导体 - NSC		/
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描述
SOT-23, ±3°C Accurate, Factory Preset Thermostat

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LM26_07 数据手册

February 2007

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 (T_OS) 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 (V_TEMP). 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 T_OSand go HIGH when the

temperature goes below (T_OS–T_HYST). Similarly, when pre-

programmed as an undertemperature shutdown (US) it will

go HIGH to indicate that the temperature is below T_USand go

LOW when the temperature is above (T_US+T_HYST). The typical

hysteresis, T_HYST, can be set to 2°C or 10°C and is controlled

by the state of the HYST pin. A V_TEMPanalog 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 V_TEMPoutput pin

V_TEMPoutput 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.

101323

www.national.com

12 3 4 5 6 7...10

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