LM56 datasheet(1/13 Pages) NSC

部件名	LM56

功能描述	Dual Output Low Power Thermostat

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制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

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LM56

Dual Output Low Power Thermostat

General Description

The LM56 is a precision low power thermostat. Two stable

temperature trip points (V

T1 and VT2) are generated by divid-

ing down the LM56 1.250V bandgap voltage reference using

3 external resistors. The LM56 has two digital outputs. OUT1

goes LOW when the temperature exceeds T1 and goes

HIGH when the the temperature goes below (T1–T

HYST).

Similarly, OUT2 goes LOW when the temperature exceeds

T2 and goes HIGH when the temperature goes below

(T2–T

HYST). THYST is an internally set 5˚C typical hysteresis.

The LM56 is available in an 8-lead Mini-SO8 surface mount

package and an 8-lead small outline package.

Applications

n

Microprocessor Thermal Management

n

Appliances

n

Portable Battery Powered 3.0V or 5V Systems

n

Fan Control

n

Industrial Process Control

n

HVAC Systems

n

Remote Temperature Sensing

n

Electronic System Protection

Features

n

Digital outputs support TTL logic levels

n

Internal temperature sensor

n

2 internal comparators with hysteresis

n

Internal voltage reference

n

Currently available in 8-pin SO plastic package

n

Future availability in the 8-pin Mini-SO8 package

Key Specifications

n

Power Supply Voltage

2.7V–10V

n

Power Supply Current

230 µA (max)

n

V

REF

1.250V ±1% (max)

n

Hysteresis Temperature

5˚C

n

Internal Temperature Sensor

Output Voltage

(+6.20 mV/˚C x T) +395 mV

n

Temperature Trip Point Accuracy:

LM56BIM

LM56CIM

+25˚C

±2˚C (max)

±3˚C (max)

+25˚C to +85˚C

±2˚C (max)

±3˚C (max)

−40˚C to +125˚C

±3˚C (max)

±4˚C (max)

Simplified Block Diagram and Connection Diagram

Order

Number

LM56BIM

LM56BIMX

LM56CIM

LM56CIMX

LM56BIMM

LM56BIMMX

LM56CIMM

LM56CIMMX

NS

Package

Number

M08A

MUA08A

SOP-8

MSOP-8

Transport

Media

2500 Units

3500 Units

Rail

Tape &

Reel

Rail

Tape &

Reel

Rail

Tape & Reel

Rail

Tape & Reel

Package

Marking

LM56BIM

LM56CIM

T02B

T02C

DS012893-1

DS012893-2

April 2000

DS012893

www.national.com

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