LM56 datasheet(1/13 Pages) NSC

Part #	LM56

Description	Dual Output Low Power Thermostat

PDF	13 Pages

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Manufacturer	NSC [National Semiconductor (TI)]

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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

dividing 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

temperature

goes

below

(T1–T

HYST). Similarly, OUT2 goes LOW when the tempera-

ture 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

Available in 8-pin SO and Mini-SO8 plastic packages

Key Specifications

j Power Supply Voltage

2.7V–10V

j Power Supply Current

230 µA (max)

j VREF

1.250V ±1% (max)

j Hysteresis Temperature

5˚C

j 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

01289301

01289302

Order

Number

LM56BIM

LM56BIMX

LM56CIM

LM56CIMX

LM56BIMM

LM56BIMMX

LM56CIMM

LM56CIMMX

NS Package

Number

M08A

MUA08A

SOP-8

MSOP-8

Transport

Media

2500 Units

1000 Units

3500 Units

1000 Units

3500 Units

Rail

Tape &

Reel

Rail

Tape &

Reel

Tape & Reel Tape & Reel Tape & Reel Tape & Reel

Package

Marking

LM56BIM

LM56CIM

T02B

T02C

January 2006

DS012893

www.national.com

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