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Details, datasheet, quote on part number:LM56B
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| Part: | LM56B |
| Category: | Sensors => Temperature Sensors |
| Description: | Dual Output Low Power Thermostat |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM56B datasheet File size : 393 kB |
| Request For quote: | Find where to buy LM56B
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Datasheet text preview:
LM56 Dual Output Low Power Thermostat
April 2000
LM56 Dual Output Low Power Thermostat
General Description
The LM56 is a precision low power thermostat. Two stable temperature trip points (VT1 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 the temperature goes below (T1 THYST). Similarly, OUT2 goes LOW when the temperature exceeds T2 and goes HIGH when the temperature goes below (T2 THYST). 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.
Features
n n n n n n Digital outputs support TTL logic levels Internal temperature sensor 2 internal comparators with hysteresis Internal voltage reference Currently available in 8-pin SO plastic package Future availability in the 8-pin Mini-SO8 package
Key Specifications
j Power Supply Voltage j Power Supply Current j VREF j Hysteresis Temperature
2.7V 10V 230 µA (max) 1.250V ± 1% (max) 5°C
Applications
n n n n n n n n 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
j Internal Temperature (+6.20 mV/°C x T) +395 mV Sensor Output Voltage n Temperature Trip Point Accuracy:
LM56BIM +25°C +25°C to +85°C -40°C to +125°C
LM56CIM
± 2°C (max) ± 2°C (max) ± 3°C (max)
± 3°C (max) ± 3°C (max) ± 4°C (max)
Simplified Block Diagram and Connection Diagram
DS012893-2 DS012893-1
Order Number NS Package Number Transport Media Package Marking
LM56BIM M08A SOP-8
LM56BIMX M08A SOP-8 2500 Units
LM56CIM M08A SOP-8
LM56CIMX M08A SOP-8 2500 Units
LM56BIMM MUA08A MSOP-8
LM56BIMMX MUA08A MSOP-8 3500 Units
LM56CIMM MUA08A MSOP-8
LM56CIMMX MUA08A MSOP-8 3500 Units
Rail LM56BIM
Tape & Reel LM56BIM
Rail LM56CIM
Tape & Reel LM56CIM
Rail T02B
Tape & Reel T02B
Rail T02C
Tape & Reel T02C
© 2001 National Semiconductor Corporation
DS012893
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LM56
Typical Application
DS012893-3
VT1 = 1.250V x (R1)/(R1 + R2 + R3) VT2 = 1.250V x (R1 + R2)/(R1 + R2 + R3) where: (R1 + R2 + R3) = 27 k and VT1 or T2 = [6.20 mV/°C x T] + 395 mV therefore: R1 = VT1/(1.25V) x 27 k R2 = (VT2/(1.25V) x 27 k) - R1 R3 = 27 k - R1 - R2
FIGURE 1. Microprocessor Thermal Management
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LM56
Absolute Maximum Ratings (Note 1)
Input Voltage Input Current at any pin (Note 2) Package Input Current(Note 2) Package Dissipation at TA = 25°C (Note 3) ESD Susceptibility (Note 4) Human Body Model Machine Model Soldering Information SO Package (Note 5) : 12V 5 mA 20 mA 900 mW 1000V 200V
Vapor Phase (60 seconds) Infrared (15 seconds) Storage Temperature
215°C 220°C -65°C to + 150°C
Operating Ratings(Note 1)
Operating Temperature Range LM56BIM, LM56CIM Positive Supply Voltage (V+) Maximum VOUT1 and VOUT2 TMIN TA TMAX -40°C TA +125°C +2.7V to +10V +10V
LM56 Electrical Characteristics
The following specifications apply for V+ = 2.7 VDC, and VREF load current = 50 µA unless otherwise specified. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C unless otherwise specified. Typical Symbol Temperature Sensor Trip Point Accuracy (Includes VREF, Comparator Offset, and Temperature Sensitivity errors) Trip Point Hysteresis +25°C TA +85°C -40°C TA +125°C TA = -40°C TA = +25°C TA = +85°C TA = +125°C Internal Temperature Sensitivity Temperature Sensitivity Error Output Impedance Line Regulation -1 µA IL +40 µA +3.0V V +10V, +25 ° C TA +85 ° C
+
LM56BIM Limits (Note 7)
LM56CIM Limits (Note 7)
Units (Limits)
Parameter
Conditions
(Note 6)
±2 ±2 ±3
4 5 6 6 +6.20 3 6 3.5 6.5 4.5 7.5 4 8
±3 ±3 ±4
3 6 3.5 6.5 4.5 7.5 4 8
°C (max) °C (max) °C (max) °C (min) °C (max) °C (min) °C (max) °C (min) °C (max) °C (min) °C (max) mV/°C
±2 ±3
1500
±3 ±4
1500
°C (max) °C (max) (max) mV/V (max) mV/V (max) mV (max) nA (max) V V
± 0.36 ± 0.61 ± 2.3
150 V -1 GND 2 1.250V 8
+
± 0.36 ± 0.61 ± 2.3
300
+3.0V V+ +10V, -40 ° C TA < 25 ° C +2.7V V+ +3.3V VT1 and VT2 Analog Inputs IBIAS VIN VOS VREF Output VREF VREF Nominal VREF Error VREF/V
+
Analog Input Bias Current Analog Input Voltage Range Comparator Offset
300
8
mV (max) V
±1 ± 12.5
+3.0V V +10V
+
±1 ± 12.5
0.25 1.1 0.15
% (max) mV (max) mV/V (max) mV (max) mV/µA (max)
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Line Regulation Load Regulation Sourcing
0.13 0.15
0.25 1.1 0.15
+2.7V V+ +3.3V VREF/IL +30 µA IL +50 µA
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