LM136-2.5 [NSC]
Reference Diode; 参考二极管
| 型号： | LM136-2.5 |
| 厂家： | 
National Semiconductor |
| 描述： | Reference Diode |
| 文件： | 总12页 (文件大小：226K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
May 1998
LM136-2.5/LM236-2.5/LM336-2.5V
Reference Diode
The LM336-2.5 is rated for operation over a 0˚C to +70˚C
temperature range. See the connection diagrams for avail-
able packages.
General Description
The LM136-2.5/LM236-2.5 and LM336-2.5 integrated cir-
cuits are precision 2.5V shunt regulator diodes. These
monolithic IC voltage references operate as
a
Features
n Low temperature coefficient
n Wide operating current of 400 µA to 10 mA
n 0.2Ω dynamic impedance
low-temperature-coefficient 2.5V zener with 0.2Ω dynamic
impedance. A third terminal on the LM136-2.5 allows the ref-
erence voltage and temperature coefficient to be trimmed
easily.
±
n
1% initial tolerance available
The LM136-2.5 series is useful as a precision 2.5V low volt-
age reference for digital voltmeters, power supplies or op
amp circuitry. The 2.5V make it convenient to obtain a stable
reference from 5V logic supplies. Further, since the
LM136-2.5 operates as a shunt regulator, it can be used as
either a positive or negative voltage reference.
n Guaranteed temperature stability
n Easily trimmed for minimum temperature drift
n Fast turn-on
n Three lead transistor package
The LM136-2.5 is rated for operation over −55˚C to +125˚C
while the LM236-2.5 is rated over a −25˚C to +85˚C tem-
perature range.
Connection Diagrams
TO-92
TO-46
Plastic Package
Metal Can Package
DS005715-8
Bottom View
DS005715-20
Order Number LM236Z-2.5,
LM236AZ-2.5, LM336Z-2.5 or LM336BZ-2.5
See NS Package Number Z03A
Bottom View
Order Number LM136H-2.5,
LM136H-2.5/883, LM236H-2.5,
LM136AH-2.5, LM136AH-2.5/883
or LM236AH-2.5
See NS Package Number H03H
© 1999 National Semiconductor Corporation
DS005715
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Connection Diagrams (Continued)
SO Package
DS005715-12
Top View
Order Number LM236M-2.5,
LM236AM-2.5, LM336M-2.5
or LM336BM-2.5
See NS Package Number M08A
Typical Applications
2.5V Reference
2.5V Reference with Minimum
Temperature Coefficient
Wide Input Range Reference
DS005715-9
DS005715-11
DS005715-10
†Adjust to 2.490V
*
Any silicon signal diode
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2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Operating Temperature Range (Note 2)
LM136
−55˚C to +150˚C
−25˚C to +85˚C
0˚C to +70˚C
LM236
LM336
Soldering Information
TO-92 Package (10 sec.)
TO-46 Package (10 sec.)
SO Package
Reverse Current
Forward Current
Storage Temperature
15 mA
10 mA
260˚C
300˚C
−60˚C to +150˚C
Vapor Phase (60 sec.)
Infrared (15 sec.)
215˚C
220˚C
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” (Appendix D) for other methods of
soldering surface mount devices.
Electrical Characteristics (Note 3)
LM136A-2.5/LM236A-2.5
LM136-2.5/LM236-2.5
LM336B-2.5
LM336-2.5
Typ Max
Parameter
Conditions
Units
Min
Typ
Max
Min
=
=
Reverse Breakdown Voltage
TA 25˚C, IR 1 mA
LM136, LM236, LM336
LM136A, LM236A, LM336B
2.440
2.465
2.490
2.490
2.6
2.540 2.390 2.490 2.590
2.515 2.440 2.490 2.540
V
V
=
Reverse Breakdown Change TA 25˚C,
With Current 400 µA≤IR≤10 mA
Reverse Dynamic Impedance TA 25˚C, IR 1 mA, f 100 Hz
6
2.6
10
mV
=
=
=
0.2
0.6
0.2
1
Ω
Temperature Stability
(Note 4)
VR Adjusted to 2.490V
=
IR 1 mA, Figure 2
0˚C≤TA≤70˚C (LM336)
−25˚C≤TA≤+85˚C
1.8
6
mV
mV
3.5
9
(LM236H, LM236Z)
−25˚C ≤ TA ≤ +85˚C (LM236M)
−55˚C≤TA≤+125˚C (LM136)
7.5
12
3
18
18
10
mV
mV
mV
Reverse Breakdown Change 400 µA≤IR≤10 mA
3
12
With Current
=
Reverse Dynamic Impedance IR 1 mA
0.4
20
1
0.4
20
1.4
Ω
=
=
±
Long Term Stability
TA 25˚C 0.1˚C, IR 1 mA,
ppm
=
t
1000 hrs
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
beyond its specified operating conditions.
Note 2: For elevated temperature operation, T max is:
j
LM136
LM236
LM336
150˚C
125˚C
100˚C
Thermal Resistance
TO-92
180˚C/W (0.4" leads)
170˚C/W (0.125" lead)
n/a
TO-46
SO-8
θja (Junction to Ambient)
440˚C/W 165˚C/W
θja (Junction to Case)
80˚C/W
n/a
Note 3: Unless otherwise specified, the LM136-2.5 is specified from −55˚C ≤ T ≤ +125˚C, the LM236-2.5 from −25˚C ≤ T ≤ +85˚C and the LM336-2.5 from 0˚C
A
A
≤ T ≤ +70˚C.
A
Note 4: Temperature stability for the LM336 and LM236 family is guaranteed by design. Design limits are guaranteed (but not 100% production tested) over the in-
dicated temperature and supply voltage ranges. These limits are not used to calculate outgoing quality levels. Stability is defined as the maximum change in V from
ref
25˚C to T (min) or T (max).
A
A
3
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Typical Performance Characteristics
Reverse Voltage Change
Zener Noise Voltage
Dynamic Impedance
DS005715-22
DS005715-23
DS005715-21
Response Time
Reverse Characteristics
Forward Characteristics
DS005715-24
DS005715-25
DS005715-26
Temperature Drift
DS005715-27
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Application Hints
The LM136 series voltage references are much easier to use
than ordinary zener diodes. Their low impedance and wide
operating current range simplify biasing in almost any circuit.
Further, either the breakdown voltage or the temperature co-
efficient can be adjusted to optimize circuit performance.
Figure 1 shows an LM136 with a 10k potentiometer for ad-
justing the reverse breakdown voltage. With the addition of
R1 the breakdown voltage can be adjusted without affecting
the temperature coefficient of the device. The adjustment
range is usually sufficient to adjust for both the initial device
tolerance and inaccuracies in buffer circuitry.
DS005715-28
If minimum temperature coefficient is desired, two diodes
can be added in series with the adjustment potentiometer as
shown in Figure 2. When the device is adjusted to 2.490V
the temperature coefficient is minimized. Almost any silicon
signal diode can be used for this purpose such as a 1N914,
1N4148 or a 1N457. For proper temperature compensation
the diodes should be in the same thermal environment as
the LM136. It is usually sufficient to mount the diodes near
the LM136 on the printed circuit board. The absolute resis-
tance of R1 is not critical and any value from 2k to 20k will
work.
FIGURE 1. LM136 With Pot for Adjustment
of Breakdown Voltage
=
±
(Trim Range
120 mV typical)
DS005715-29
FIGURE 2. Temperature Coefficient Adjustment
=
±
(Trim Range
70 mV typical)
Low Cost 2 Amp Switching Regulator†
DS005715-5
*
L1 60 turns #16 wire on Arnold Core A-254168-2
†Efficiency ≈ 80%
5
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Application Hints (Continued)
Precision Power Regulator with Low Temperature Coefficient
DS005715-13
5V Crowbar
Trimmed 2.5V Reference with
Temperature Coefficient Independent
of Breakdown Voltage
DS005715-15
*
Does not affect temperature coefficient
DS005715-14
Adjustable Shunt Regulator
DS005715-6
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Application Hints (Continued)
Linear Ohmmeter
DS005715-16
7
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Application Hints (Continued)
2.5V Square Wave Calibrator
Op Amp with Output Clamped
DS005715-19
5V Buffered Reference
DS005715-17
Bipolar Output Reference
DS005715-30
Low Noise Buffered Reference
DS005715-31
DS005715-18
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Schematic Diagram
DS005715-1
9
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Physical Dimensions inches (millimeters) unless otherwise noted
Order Number LM136H-2.5, LM136H-2.5/883, LM236H-2.5, LM136AH-2.5, LM136AH-2.5/883 or LM236AH-2.5
NS Package Number H03H
Small Outline (SO) Package (M)
Order Number LM236M-2.5, LM236AM-2.5, LM336M-2.5 or LM336BM-2.5
NS Package Number M08A
11
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
TO-92 Plastic Package (Z)
Order Number LM236Z-2.5, LM236AZ-2.5, LM336Z-2.5 or LM336BZ-2.5
NS Package Number Z03A
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