FEATURES
■Guaranteed Temperature Stability
■Maximum 0.6Ω Dynamic Impedance
■Adjustable for Minimum Temperature Coefficient
■Wide Operating Current Range
APPLICATIOUS
■Reference for 5V Systems
■8-Bit A/D and D/A Reference
■Digital Voltmeters
■Current Loop Measurement and Control Systems
■Power Supply Monitor
, LTC and LT are registered trademarks of Linear Technology Corporation.
LM136-2.5/LM336-2.5
2.5V Reference
DESCRIPTIOU
The LM136-2.5 is a general purpose shunt regulator diode designed to operate over a wide current range while maintaining good stability with time and temperature. The third terminal allows either the temperature coefficient to be minimized or the reference voltage to be adjusted without changing the temperature coefficient. Because it operates as a shunt regulator it can be used equally well as a positive or negative reference.
The LM136-2.5 is available with initial tolerances as low as 1% in either a TO-46 metal can for hermetic requirements or a low cost TO-92 plastic package.
Linear’s advanced design, test and process techniques have optimized the LM136-2.5 to achieve superior performance and reliability over previous designs. For more demanding precision reference applications requiring very low initial tolerance and temperature coefficients, consult the LT1009 data sheet. A typical 2.5V reference with trim is shown below.
TYPICAL APPLICATIOU
2.5V Reference
5V TO 35V
3.6k
OUTPUT
LM336-2.5 |
10k* |
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TRIM |
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* DOES NOT AFFECT TEMPERATURE COEFFICIENT
136/336 TA01a
REVERSE VOLTAGE CHANGE (mV)
Reverse Voltage Change
3.5
TA = 25°C
3.0
2.5
2.0
1.5
1.0
0.5
0
0 |
2 |
4 |
6 |
8 |
10 |
REVERSE CURRENT (mA)
136/336 TA01b
1
LM136-2.5/LM336-2.5
ABSOLUTE
WAXIWUW
RATI
UGS
(Note 1)
Operating Temperature Range |
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LM136-2.5 (OBSOLETE) .............. |
–55°C to 125°C |
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LM336-2.5 .............................................. |
0°C to 70°C |
Storage Temperature Range ................. |
– 65°C to 150°C |
Lead Temperature (Soldering, 10 sec).................. |
300°C |
Reverse Current .................................................... |
15mA |
Forward Current ................................................... |
10mA |
PACKAGE/ORDER IUFORWATIOU
BOTTOM VIEW |
ORDER PART |
BOTTOM VIEW |
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NUMBER |
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+ |
ADJ + – |
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LM136H-2.5 |
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ADJ |
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– |
LM136AH-2.5 |
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LM336H-2.5 |
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LM336AH-2.5 |
Z PACKAGE |
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H PACKAGE |
3-LEAD PLASTIC TO-92 |
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3-LEAD TO-46 METAL CAN |
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TJMAX = 150°C, θJA = 160°C/W |
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TJMAX = 150°C, θJA = 440°C/W |
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(NOTE 2) |
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(NOTE 2) |
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OBSOLETE PACKAGE
Consider the Z Packages for Alternate Source
ORDER PART
NUMBER
LM336Z-2.5 LM336BZ-2.5
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2)
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LM136/LM136A |
LM336/LM336B |
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SYMBOL |
PARAMETER |
CONDITIONS |
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MIN |
TYP |
MAX |
MIN |
TYP |
MAX |
UNITS |
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VZ |
Reverse Breakdown Voltage |
TA = 25°C, IR = 1mA |
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LM136/LM336 |
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2.440 |
2.490 |
2.540 |
2.390 |
2.490 |
2.590 |
V |
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LM136A/LM336B |
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2.465 |
2.490 |
2.515 |
2.440 |
2.490 |
2.540 |
V |
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VZ |
Reverse Breakdown Change |
400µA ≤ IR ≤ 10mA |
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IR |
with Current |
TA = 25°C |
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2.6 |
6 |
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2.6 |
10 |
mV |
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TMIN ≤ TA ≤ TMAX |
● |
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3.0 |
10 |
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3.0 |
12 |
mV |
rZ |
Reverse Dynamic Impedance |
IR = 1mA |
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TA =25°C |
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0.2 |
0.6 |
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0.2 |
1.0 |
Ω |
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TMIN ≤ TA ≤ TMAX |
● |
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0.4 |
1.0 |
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0.4 |
1.4 |
Ω |
VZ |
Temperature Stability |
VR Adjusted to 2.490V, IR = 1mA, |
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Temp |
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TMIN ≤ TA ≤ TMAX (See Figure 1) |
● |
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12 |
18 |
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1.8 |
6 |
mV |
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VZ |
Long Term Stability |
TA = 25°C ± 0.1°C, IR = 1mA |
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20 |
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20 |
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ppm/kHr |
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Time |
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Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
Note 2: The LT1009 is an improved, low cost, pin for pin replacement for the “A” and “B” versions. For further information consult the LT1009 data sheet.
V+ |
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2.490V |
R |
* |
D1† |
D1, D2 1N4148 |
1mA |
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5k |
* ADJUST TO 2.490 |
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† ANY SILICON |
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D2† |
SIGNAL DIODE |
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136/336 F01 |
Figure 1. Adjusting the LM336 for Minimum Temperature Coefficient
2