LM56CIMM/NOPB National Semiconductor, LM56CIMM/NOPB Datasheet

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LM56CIMM/NOPB

Manufacturer Part Number
LM56CIMM/NOPB
Description
IC, LOW POWER THERMOSTAT, ± 3°C, MSOP-8
Manufacturer
National Semiconductor
Datasheet

Specifications of LM56CIMM/NOPB

Ic Output Type
Digital
Sensing Accuracy Range
± 3°C
Supply Current
230µA
Supply Voltage Range
2.7V To 10V
Sensor Case Style
MSOP
No. Of Pins
8
Msl
MSL 1 - Unlimited
Accuracy %
3°C
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM56CIMM/NOPB
Manufacturer:
TI/德州仪器
Quantity:
20 000
© 2009 National Semiconductor Corporation
Dual Output Low Power Thermostat
General Description
The LM56 is a precision low power thermostat. Two stable
temperature trip points (V
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
OUT2 goes LOW when the temperature exceeds T2 and goes
HIGH when the temperature goes below (T2–T
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
Simplified Block Diagram and Connection Diagram
NS Package
Number
Transport
Media
Package
Number
Marking
Microprocessor Thermal Management
Appliances
Portable Battery Powered 3.0V or 5V Systems
Fan Control
Industrial Process Control
HVAC Systems
Remote Temperature Sensing
Electronic System Protection
Order
LM56BIM LM56BIMX LM56CIM LM56CIMX LM56BIMM LM56BIMMX LM56CIMM LM56CIMMX
LM56BIM
SOP-8
M08A
Rail
T1
Tape & Reel
2500 Units
and V
LM56BIM
SOP-8
M08A
T2
) are generated by divid-
12893
LM56CIM
SOP-8
M08A
Rail
HYST
HYST
). Similarly,
). T
1289301
Tape & Reel Tape & Reel Tape & Reel Tape & Reel Tape & Reel
2500 Units
HYST
LM56CIM
SOP-8
M08A
is
LM56
Features
Key Specifications
■ 
■ 
■ 
■ 
■ 
+25°C
+25°C to +85°C
−40°C to +125°C
Digital outputs support TTL logic levels
Internal temperature sensor
2 internal comparators with hysteresis
Internal voltage reference
Available in 8-pin SO and Mini-SO8 plastic packages
Temperature Trip Point Accuracy:
1000 Units
Power Supply Voltage
Power Supply Current
V
Hysteresis Temperature
Internal Temperature Sensor Output Voltage:
MUA08A
MSOP-8
REF
T02B
(+6.20 mV/°C x T) + 395 mV
3500 Units
MUA08A
MSOP-8
T02B
±2°C (max)
±2°C (max)
±3°C (max)
LM56BIM
1000 Units
MUA08A
MSOP-8
T02C
1.250V ±1% (max)
August 22, 2009
±3°C (max)
±3°C (max)
±4°C (max)
LM56CIM
230 μA (max)
www.national.com
3500 Units
MUA08A
MSOP-8
2.7V–10V
T02C
1289302
5°C

Related parts for LM56CIMM/NOPB

LM56CIMM/NOPB Summary of contents

Page 1

... SOP-8 SOP-8 2500 Units Transport Media Rail Tape & Reel Package LM56BIM LM56BIM Marking © 2009 National Semiconductor Corporation LM56 Features ■ Digital outputs support TTL logic levels ) are generated by divid- ■ Internal temperature sensor ■ 2 internal comparators with hysteresis ■ ...

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

... Storage Temperature 12V Operating Ratings Operating Temperature Range LM56BIM, LM56CIM 900 mW Positive Supply Voltage (V Maximum V 800V 1000V Soldering Semiconductor's Reflow Temperature Profile specifications. Refer to www.national.com/packaging.(Note 3) load current = 50 μA unless otherwise specified. Boldface limits + = 2 and V DC REF = T = 25°C unless otherwise specified Conditions ≤ ...

Page 4

... Note 3: Reflow temperature profiles are different for lead-free and non-lead-free packages. Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by T ambient thermal resistance) and T (ambient temperature) ...

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 1289304 Trip Point Hysteresis vs Temperature 1289332 Temperature Sensor Output Accuracy vs Temperature 1289308 5 1289305 1289307 1289309 www.national.com ...

Page 6

... Trip Point Accuracy vs Temperature OUT1 and OUT2 Leakage Current vs Temperature V Start-Up Response REF www.national.com Comparator Bias Current vs Temperature 1289310 V Output Line Regulation vs Temperature TEMP 1289312 V TEMP 1289313 6 1289311 1289331 Start-Up Response 1289314 ...

Page 7

... This output is not in- 2 tended to directly drive a fan motor. V This is the input pin for the temperature trip point volt- T1 age for OUT1. V This is the input pin for the low temperature trip point T2 voltage for OUT2 1.250V x (R1)/( R3 1.250V x (R1 + R2)/( R3) ...

Page 8

... When the temperature sensor output is equal to the trip point level the bias current will be 150 nA (max). Once the temperature is well above the trip point level the bias current will be 300 nA (max). Therefore, the first trip point will be affected by 150 nA of bias current. ...

Page 9

... 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 of the ambient air actually sensing the temper- ature difference of the air and the lands and printed circuit board that the leads are attached to ...

Page 10

... Without any special precautions, these outputs can drive any capacitive load as shown in Figure 4 5.0 NOISY ENVIRONMENTS Over the specified temperature range the LM56 V has a maximum output impedance of 1500Ω extremely noisy environment it may be necessary to add some filtering to minimize noise pickup recommended that 0.1 μF be ...

Page 11

... R2, and the voltage reference. This fault detection output from the comparator now can be used to turn on a cooling fan. The circuit as shown in design to turn the fan on when heat sink temperature exceeds about 80°C, and to turn the fan off when the heat sink temperature falls below approximately 75°C. 11 1289321 www ...

Page 12

FIGURE 7. Simple Thermostat 12 1289322 ...

Page 13

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

Page 14

... 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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