lm56bimmx National Semiconductor Corporation, lm56bimmx Datasheet

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lm56bimmx

Manufacturer Part Number
lm56bimmx
Description
Dual Output Low Power Thermostat
Manufacturer
National Semiconductor Corporation
Datasheet

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Quantity
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Part Number:
LM56BIMMX
Manufacturer:
NS/国半
Quantity:
20 000
Part Number:
lm56bimmx/NOPB
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© 2006 National Semiconductor Corporation
LM56
Dual Output Low Power Thermostat
General Description
The LM56 is a precision low power thermostat. Two stable
temperature trip points (V
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 the temperature goes below
(T1–T
ture exceeds T2 and goes HIGH when the temperature goes
below (T2–T
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
Simplified Block Diagram and Connection Diagram
NS Package
Number
Transport
Media
Package
Number
Marking
Order
HYST
). Similarly, OUT2 goes LOW when the tempera-
HYST
LM56BIM LM56BIMX LM56CIM LM56CIMX LM56BIMM LM56BIMMX LM56CIMM LM56CIMMX
LM56BIM
SOP-8
M08A
). T
Rail
HYST
T1
is an internally set 5˚C typical
2500 Units
LM56BIM
Tape &
SOP-8
M08A
and V
Reel
T2
) are generated by
DS012893
LM56CIM
SOP-8
M08A
Rail
01289301
2500 Units
LM56CIM
Tape &
SOP-8
M08A
Reel
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
n Temperature Trip Point Accuracy:
j
j
j
j
j
+25˚C
+25˚C to +85˚C
−40˚C to +125˚C
Tape & Reel Tape & Reel Tape & Reel Tape & Reel
Power Supply Voltage
Power Supply Current
V
Hysteresis Temperature
Internal Temperature Sensor Output Voltage:
1000 Units
MUA08A
MSOP-8
REF
T02B
(+6.20 mV/˚C x T) + 395 mV
3500 Units
MUA08A
MSOP-8
T02B
±
±
±
LM56BIM
2˚C (max)
2˚C (max)
3˚C (max)
1000 Units
MUA08A
MSOP-8
T02C
1.250V
±
±
±
230 µA (max)
LM56CIM
January 2006
www.national.com
3˚C (max)
3˚C (max)
4˚C (max)
3500 Units
±
MUA08A
MSOP-8
2.7V–10V
01289302
1% (max)
T02C
5˚C

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lm56bimmx Summary of contents

Page 1

... Portable Battery Powered 3. Systems n Fan Control n Industrial Process Control n HVAC Systems n Remote Temperature Sensing n Electronic System Protection Simplified Block Diagram and Connection Diagram Order LM56BIM LM56BIMX LM56CIM LM56CIMX LM56BIMM LM56BIMMX LM56CIMM LM56CIMMX Number NS Package M08A M08A Number SOP-8 SOP-8 2500 Units ...

Page 2

Typical Application V = 1.250V x (R1)/( R3 1.250V x (R1 + R2)/( R3) T2 where kΩ and V = [6.20 mV/˚ ...

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 4) ESD Susceptibility (Note 5) Human Body Model - Pin 3 Only: All other pins Machine ...

Page 4

Symbol Parameter + V Power Supply I Supply Current S Digital Outputs I Logical “1” Output Leakage OUT(“1”) Current V Logical “0” Output Voltage OUT(“0”) Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. ...

Page 5

Typical Performance Characteristics Quiescent Current vs Temperature OUT1 and OUT2 Voltage Levels vs Load Current Temperature Sensor Output Voltage vs Temperature V Output Voltage vs Load Current REF 01289304 Trip Point Hysteresis vs Temperature 01289332 Temperature Sensor Output Accuracy vs ...

Page 6

Typical Performance Characteristics Trip Point Accuracy vs Temperature OUT1 and OUT2 Leakage Current vs Temperature V Start-Up Response REF www.national.com (Continued) Comparator Bias Current vs Temperature 01289310 V Output Line Regulation vs Temperature TEMP 01289312 V 01289313 6 01289311 01289331 ...

Page 7

Functional Description Pin Descriptions + V This is the positive supply voltage pin. This pin should be bypassed with a 0.1 µF capacitor to ground. GND This is the ground pin. V This is the 1.250V bandgap voltage reference output ...

Page 8

Application Hints 1.0 LM56 TRIP POINT ACCURACY SPECIFICATION For simplicity the following is an analysis of the trip point accuracy using the single output configuration show in Fig- ure 2 with a set point of 82˚C. Trip Point Error Voltage ...

Page 9

Application Hints (Continued) 3.0 MOUNTING CONSIDERATIONS The majority of the temperature that the LM56 is measuring is the temperature of its leads. Therefore, when the LM56 is placed on a printed circuit board not sensing the tem- perature ...

Page 10

Application Hints (Continued) 4.0 V AND V CAPACITIVE LOADING REF TEMP The LM56 V and V outputs handle capacitive load- REF TEMP ing well. Without any special precautions, these outputs can drive any capacitive load as shown in Figure 4 ...

Page 11

Application Hints (Continued) where I = 300 nA (the maximum specified error). B The current shown in Figure simple overtemperature detector for power devices. In this example, an audio power amplifier IC is bolted to a heat ...

Page 12

... Physical Dimensions 8-Lead (0.150" Wide) Molded Small Outline Package, JEDEC Order Number LM56BIM, LM56BIMX, LM56CIM or LM56CIMX Order Number LM56BIMM, LM56BIMMX, LM56CIMM, or LM56CIMMX www.national.com inches (millimeters) unless otherwise noted NS Package Number M08A 8-Lead Molded Mini Small Outline Package (MSOP) (JEDEC REGISTRATION NUMBER M0-187) ...

Page 13

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information ...

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