NSC LM66CIM-RLSKB Datasheet
LM66
Dual Output Internally Preset Thermostat
General Description
The LM66 is a precision low power thermostat. Two stable
temperature trip points (V
T1
and VT2) are generated by dividing down the LM66 1.250V bandgap voltage reference using
a resistors divider network. The LM66 has two digital outputs. OUT1 goes LOW when the temperature exceeds T1
and goes HIGH when the the temperature goes below
(T1–T
HYST
). Similarly, OUT2 goes LOW when the temperature exceeds T2 and goes HIGH when the temperature goes
below (T2–T
HYST
). T
HYST
is an internally set 5˚C typical hys-
teresis.
The LM66 is currently available in 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 Currently available in 8-pin SO plastic package
Key Specifications
n Power Supply Voltage 2.7V to 10V
n Power Supply Current 250 µA (max)
n V
REF
1.250V±1.4% (max)
n Hysteresis Temperature 5˚C
n Internal Temperature Sensor
Output Voltage (+6.20 mV/˚C x T) +400 mV
n Temperature Trip Point Accuracy
±
3˚C (max)
n T1 set point +73˚C
n T2 set point +82˚C
Simplified Block Diagram and
Connection Diagram
Ordering Information
TABLE 1.
Order Number LM66CIM-
RLSKB
LM66CIMX-
RLSKB
NS Tackage
Number
M08A M08A
Transport Media Bulk Rail 2500 Units Tape
& Reel
Typical Application
DS100854-1
DS100854-2
DS100854-3
April 2000
LM66 Dual Output Internally Preset Thermostat
© 2000 National Semiconductor Corporation DS100854 www.national.com
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 T
A
= 25˚C
(Note 3) 900 mW
ESD Susceptibility (Note 4)
Human Body Model 1000V
Machine Model 200V
Soldering Information
SO Package (Note 5) :
Vapor Phase (60 seconds) 215˚C
Infrared (15 seconds) 220˚C
Storage Temperature −65˚C to + 150˚C
Operating Ratings (Note 1)
Operating Temperature Range T
MIN
≤ TA≤ T
MAX
LM66CIM −40˚C ≤ TA≤ +125˚C
Positive Supply Voltage (V
+
) +2.7V to +10V
Maximum V
OUT1
and V
OUT2
+10V
LM66 Electrical Characteristics
The following specifications apply for V+= 2.7 VDC, and V
REF
load current = 0 µA unless otherwise specified. Boldface lim-
its apply for TA=TJ=T
MIN
to T
MAX
; all other limits TA=TJ= 25˚C unless otherwise specified.
Typical LM66CIM Units
Symbol Parameter Conditions (Note 6) Limits (Limits)
(Note 7)
Temperature Sensor
Trip Point Accuracy (Includes
V
REF
, Comparator Offset, and +25˚C ≤ TA≤ +85˚C
±
3 ˚C (max)
Temperature Sensitivity errors)
Trip Point Hysteresis T
A
= +73˚C 6 4.5 ˚C (min)
7.5 ˚C (max)
T
A
= +82˚C 6 4.5 ˚C (min)
7.5 ˚C (max)
Internal Temperature Sensitivity +6.20 mV/˚C
Temperature Sensitivity Error +25˚C ≤ T
A
≤ +85˚C
±
3 ˚C (max)
−25˚C ≤ T
A
≤ +125˚C
±
4 ˚C (max)
−40˚C ≤ T
A
≤ −25˚C
±
5 ˚C (max)
Output Impedance −1 µA ≤ I
L
≤ +40 µA 1500 Ω (max)
Line Regulation +3.0V ≤ V
+
≤ +10V,
+25˚C ≤ T
A
≤ +85˚C
±
0.36 mV/V (max)
+3.0V ≤ V
+
≤ +10V,
−40˚C ≤ T
A
<
25˚C
±
0.61 mV/V (max)
+2.7V ≤ V
+
≤ +3.3V
±
2.3 mV (max)
V
REF
Output
V
REF
V
REF
Nominal 1.250V V
V
REF
Error
±
1.4 % (max)
±
17.5 mV (max)
∆V
REF
/∆V
+
Line Regulation +3.0V ≤ V+≤ +10V 0.13 0.21 mV/V (max)
+2.7V ≤ V
+
≤ +3.3V 0.15 1.5 mV (max)
LM66
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