LM567CNNOPB - NATIONAL SEMICONDUCTOR

LM56

LM56 Dual Output Low Power Thermostat

Literature Number: SNIS120F

LM56

August 22, 2009

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 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–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.

Applications

■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

Features

■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

Key Specifications

■ Power Supply Voltage 2.7V–10V

■ Power Supply Current 230 μA (max)

■ VREF 1.250V ±1% (max)

■ Hysteresis Temperature 5°C

■ Internal Temperature Sensor Output Voltage:

(+6.20 mV/°C x T) + 395 mV

■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

1289301

1289302

Order

Number

LM56BIM LM56BIMX LM56CIM LM56CIMX LM56BIMM LM56BIMMX LM56CIMM LM56CIMMX

NS Package

Number

M08A M08A M08A M08A MUA08A MUA08A MUA08A MUA08A

SOP-8 SOP-8 SOP-8 SOP-8 MSOP-8 MSOP-8 MSOP-8 MSOP-8

Transport

Media

2500 Units 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 LM56BIM LM56CIM LM56CIM T02B T02B T02C T02C

LM56 Dual Output Low Power Thermostat

Typical Application

1289303

VT1 = 1.250V x (R1)/(R1 + R2 + R3)

VT2 = 1.250V x (R1 + R2)/(R1 + R2 + R3)

where:

(R1 + R2 + R3) = 27 kΩ and

VT1 or T2 = [6.20 mV/°C x T] + 395 mV therefore:

R1 = VT1/(1.25V) x 27 kΩ

R2 = (VT2/(1.25V) x 27 kΩ) − R1

R3 = 27 kΩ − R1 − R2

FIGURE 1. Microprocessor Thermal Management

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LM56

Absolute Maximum Ratings (Note 1)

Input Voltage 12V

Input Current at any pin (Note 2) 5 mA

Package Input Current(Note 2) 20 mA

Package Dissipation at TA = 25°C

(Note 4) 900 mW

ESD Susceptibility (Note 5)

Human Body Model - Pin 3 Only: 800V

All other pins 1000V

Machine Model 125V

Storage Temperature −65°C to + 150°C

Operating Ratings (Note 1)

Operating Temperature Range TMIN ≤ TA ≤ TMAX

LM56BIM, LM56CIM −40°C ≤ TA ≤ +125°C

Positive Supply Voltage (V+)+2.7V to +10V

Maximum VOUT1 and VOUT2 +10V

Soldering process must comply with National

Semiconductor's Reflow Temperature Profile specifications.

Refer to www.national.com/packaging.(Note 3)

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 LM56BIM LM56CIM Units

Symbol Parameter Conditions (Note 6)Limits Limits (Limits)

(Note 7) (Note 7)

Temperature Sensor

Trip Point Accuracy (Includes ±2 ±3 °C (max)

VREF, Comparator Offset, and +25°C ≤ TA ≤ +85°C ±2 ±3 °C (max)

Temperature Sensitivity errors) −40°C ≤ TA ≤ +125°C ±3 ±4 °C (max)

Trip Point Hysteresis TA = −40°C 43 3 °C (min)

6 6 °C (max)

TA = +25°C 53.5 3.5 °C (min)

6.5 6.5 °C (max)

TA = +85°C 64.5 4.5 °C (min)

7.5 7.5 °C (max)

TA = +125°C 64 4 °C (min)

8 8 °C (max)

Internal Temperature +6.20 mV/°C

Sensitivity

Temperature Sensitivity Error ±2 ±3 °C (max)

±3 ±4 °C (max)

Output Impedance −1 μA ≤ IL ≤ +40 μA 1500 1500 Ω (max)

Line Regulation +3.0V ≤ V+ ≤ +10V,

+25 °C ≤ TA ≤ +85 °C

–0.72/

+0.36

–0.72/

+0.36

mV/V (max)

+3.0V ≤ V+ ≤ +10V,

−40 °C ≤ TA <25 °C

–1.14/

+0.61

–1.14/

+0.61

mV/V (max)

+2.7V ≤ V+ ≤ +3.3V ±2.3 ±2.3 mV (max)

VT1 and VT2 Analog Inputs

IBIAS Analog Input Bias Current 150 300 300 nA (max)

VIN Analog Input Voltage Range V+ − 1 V

GND V

VOS Comparator Offset 2 8 8 mV (max)

VREF Output

VREF VREF Nominal 1.250V V

VREF Error ±1 ±1 % (max)

±12.5 ±12.5 mV (max)

ΔVREF/ΔV+Line Regulation +3.0V ≤ V+ ≤ +10V 0.13 0.25 0.25 mV/V (max)

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LM56

Typical LM56BIM LM56CIM Units

Symbol Parameter Conditions (Note 6)Limits Limits (Limits)

(Note 7) (Note 7)

+2.7V ≤ V+ ≤ +3.3V 0.15 1.1 1.1 mV (max)

ΔVREF/ΔILLoad Regulation Sourcing +30 μA ≤ IL ≤ +50 μA 0.15 0.15 mV/μA (max)

Symbol Parameter Conditions Typical Limits Units

(Note 6) (Note 7)(Limits)

V+ Power Supply

ISSupply Current V+ = +10V 230 μA (max)

V+ = +2.7V 230 μA (max)

Digital Outputs

IOUT(“1”) Logical “1” Output Leakage V+ = +5.0V 1μA (max)

Current

VOUT(“0”) Logical “0” Output Voltage IOUT = +50 μA 0.4 V (max)

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed

specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test

conditions.

Note 2: When the input voltage (VI) at any pin exceeds the power supply (VI < GND or VI > V+), the current at that pin should be limited to 5 mA. The 20 mA

maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5 mA to four.

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 TJmax (maximum junction temperature), θJA (junction to

ambient thermal resistance) and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PD = (TJmax–TA)/θJA or the number

given in the Absolute Maximum Ratings, whichever is lower. For this device, TJmax = 125°C. For this device the typical thermal resistance (θJA) of the different

package types when board mounted follow:

Package Type θJA

M08A 110°C/W

MUA08A 250°C/W

Note 5: The human body model is a 100 pF capacitor discharge through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged

directly into each pin.

Note 6: Typicals are at TJ = TA = 25°C and represent most likely parametric norm.

Note 7: Limits are guaranteed to National's AOQL (Average Outgoing Quality Level).

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LM56

Typical Performance Characteristics

Quiescent Current vs Temperature

1289304

VREF Output Voltage vs Load Current

1289305

OUT1 and OUT2 Voltage Levels vs Load Current

1289332

Trip Point Hysteresis vs Temperature

1289307

Temperature Sensor Output Voltage vs Temperature

1289308

Temperature Sensor Output Accuracy vs Temperature

1289309

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LM56

Trip Point Accuracy vs Temperature

1289310

Comparator Bias Current vs Temperature

1289311

OUT1 and OUT2 Leakage Current vs Temperature

1289312

VTEMP Output Line Regulation vs Temperature

1289331

VREF Start-Up Response

1289313

VTEMP Start-Up Response

1289314

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LM56

Functional Description

1289315

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.

VREF This is the 1.250V bandgap voltage reference output

pin. In order to maintain trip point accuracy this pin

should source a 50 μA load.

VTEMP This is the temperature sensor output pin.

OUT1 This is an open collector digital output. OUT1 is active

LOW. It goes LOW when the temperature is greater

than T1 and goes HIGH when the temperature drops

below T1– 5°C. This output is not intended to directly

drive a fan motor.

OUT2 This is an open collector digital output. OUT2 is active

LOW. It goes LOW when the temperature is greater

than the T2 set point and goes HIGH when the tem-

perature is less than T2– 5°C. This output is not in-

tended to directly drive a fan motor.

VT1 This is the input pin for the temperature trip point volt-

age for OUT1.

VT2 This is the input pin for the low temperature trip point

voltage for OUT2.

1289316

VT1 = 1.250V x (R1)/(R1 + R2 + R3)

VT2 = 1.250V x (R1 + R2)/(R1 + R2 + R3)

where:

(R1 + R2 + R3) = 27 kΩ and

VT1 or T2 = [6.20 mV/°C x T] + 395 mV therefore:

R1 = VT1/(1.25V) x 27 kΩ

R2 = (VT2/(1.25V) x 27 k)Ω–R1

R3 = 27 kΩ − R1 − R2

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LM56

Application Hints

1.0 LM56 TRIP POINT ACCURACY SPECIFICATION

For simplicity the following is an analysis of the trip point ac-

curacy using the single output configuration show in Figure

2 with a set point of 82°C.

Trip Point Error Voltage = VTPE,

Comparator Offset Error for VT1E

Temperature Sensor Error = VTSE

Reference Output Error = VRE

1289317

FIGURE 2. Single Output Configuration

1. VTPE = ±VT1E − VTSE + VRE

Where:

2. VT1E = ±8 mV (max)

3. VTSE = (6.20 mV/°C) x (±3°C) = ±18.6 mV

4. VRE = 1.250V x (±0.01) R2/(R1 + R2)

Using Equations from page 1 of the datasheet.

VT1=1.25VxR2/(R1+R2)=(6.20 mV/°C)(82°C) +395 mV

Solving for R2/(R1 + R2) = 0.7227

then,

5. VRE = 1.250V x (±0.01) R2/(R1 + R2) = (0.0125) x (0.7227)

= ±9.03 mV

The individual errors do not add algebraically because, the

odds of all the errors being at their extremes are rare. This is

proven by the fact the specification for the trip point accuracy

stated in the Electrical Characteristic for the temperature

range of −40°C to +125°C, for example, is specified at ±3°C

for the LM56BIM. Note this trip point error specification does

not include any error introduced by the tolerance of the actual

resistors used, nor any error introduced by power supply vari-

ation.

If the resistors have a ±0.5% tolerance, an additional error of

±0.4°C will be introduced. This error will increase to ±0.8°C

when both external resistors have a ±1% tolerance.

2.0 BIAS CURRENT EFFECT ON TRIP POINT ACCURACY

Bias current for the comparator inputs is 300 nA (max) each,

over the specified temperature range and will not introduce

considerable error if the sum of the resistor values are kept to

about 27 kΩ as shown in the typical application of Figure 1 .

This bias current of one comparator input will not flow if the

temperature is well below the trip point level. As the temper-

ature approaches trip point level the bias current will start to

flow into the resistor network. 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.

The leakage current is very small when the comparator input

transistor of the different pair is off (see Figure 3) .

The effect of the bias current on the first trip point can be de-

fined by the following equations:

where IB = 300 nA (the maximum specified error).

The effect of the bias current on the second trip point can be

defined by the following equations:

where IB = 300 nA (the maximum specified error).

The closer the two trip points are to each other the more sig-

nificant the error is. Worst case would be when VT1 = VT2 =

VREF/2.

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LM56

1289318

FIGURE 3. Simplified Schematic

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, it is not sensing the tem-

perature of the ambient air. It is actually sensing the temper-

ature difference of the air and the lands and printed circuit

board that the leads are attached to. The most accurate tem-

perature sensing is obtained when the ambient temperature

is equivalent to the LM56's lead temperature.

As with any IC, the LM56 and accompanying wiring and cir-

cuits must be kept insulated and dry, to avoid leakage and

corrosion. This is especially true if the circuit operates at cold

temperatures where condensation can occur. Printed-circuit

coatings are often used to ensure that moisture cannot cor-

rode the LM56 or its connections.

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LM56

4.0 VREF AND VTEMP CAPACITIVE LOADING

1289319

FIGURE 4. Loading of VREF and VTEMP

The LM56 VREF and VTEMP outputs handle capacitive loading

well. 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 VTEMPoutput

has a maximum output impedance of 1500Ω. In an extremely

noisy environment it may be necessary to add some filtering

to minimize noise pickup. It is recommended that 0.1 μF be

added from V+ to GND to bypass the power supply voltage,

as shown in Figure 4 . In a noisy environment it may be nec-

essary to add a capacitor from the VTEMP output to ground. A

1 μF output capacitor with the 1500Ω output impedance will

form a 106 Hz lowpass filter. Since the thermal time constant

of the VTEMP output is much slower than the 9.4 ms time con-

stant formed by the RC, the overall response time of the

VTEMP output will not be significantly affected. For much larger

capacitors this additional time lag will increase the overall re-

sponse time of the LM56.

6.0 APPLICATIONS CIRCUITS

1289320

FIGURE 5. Reducing Errors Caused by Bias Current

The circuit shown in Figure 5 will reduce the effective bias

current error for VT2 as discussed in Section 3.0 to be equiv-

alent to the error term of VT1. For this circuit the effect of the

bias current on the first trip point can be defined by the fol-

lowing equations:

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LM56

where IB = 300 nA (the maximum specified error).

Similarly, bias current affect on VT2 can be defined by:

where IB = 300 nA (the maximum specified error).

The current shown in Figure 6 is a simple overtemperature

detector for power devices. In this example, an audio power

amplifier IC is bolted to a heat sink and an LM56 Celsius tem-

perature sensor is mounted on a PC board that is bolted to

the heat sink near the power amplifier. To ensure that the

sensing element is at the same temperature as the heat sink,

the sensor's leads are mounted to pads that have feed

throughs to the back side of the PC board. Since the LM56 is

sensing the temperature of the actual PC board the back side

of the PC board also has large ground plane to help conduct

the heat to the device. The comparator's output goes low if

the heat sink temperature rises above a threshold set by R1,

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.

1289321

FIGURE 6. Audio Power Amplifier Overtemperature Detector

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LM56

1289322

FIGURE 7. Simple Thermostat

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LM56

Physical Dimensions inches (millimeters) unless otherwise noted

8-Lead (0.150″ Wide) Molded Small Outline Package, JEDEC

Order Number LM56BIM, LM56BIMX, LM56CIM or LM56CIMX

NS Package Number M08A

8-Lead Molded Mini Small Outline Package (MSOP)

(JEDEC REGISTRATION NUMBER M0-187)

Order Number LM56BIMM, LM56BIMMX, LM56CIMM, or LM56CIMMX

NS Package Number MUA08A

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LM56

Notes

LM56 Dual Output Low Power Thermostat

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