STMICROELECTRONICS LM336B

LM236
LM336,B
2.5V VOLTAGE REFERENCES
..
..
.
LOW TEMPERATURE COEFFICIENT
WIDE OPERATING CURRENT OF 400µA TO
10mA
0.2Ω DYNAMIC IMPEDANCE
GUARANTEED TEMPERATURE STABILITY
FAST TURN-ON
Z
TO92
(Plastic Package
D
SO8
(Plastic Micropackage)
DESCRIPTION
The LM236 and LM336 are precision 2.5V regulator
diodes. These voltage reference monolithic ICs operate like 2.5V zener diodes with a low temperature
coefficient and a dynamic impedance of 0.2Ω. A
third pin enables adjusting the reference voltage
and the temperature coefficient.
ORDER CODES
Part num- Temperature Range
ber
–25oC, +85oC
LM236
o
o
0 C, +70 C
LM336,B
Package
Z
D
•
•
•
•
PIN CONNECTIONS
TO92
(Bottom view)
ADJ
October 1997
V+
V-
SO8
(Top view)
V+
8
NC
7
NC
6
ADJ
5
1
NC
2
NC
3
NC
4
V
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LM236 - LM336,B
SCHEMATIC DIAGRAM
V
50kΩ
24kΩ
24kΩ
6.6kΩ
6pF
3pF 10kΩ
600Ω
30kΩ
ADJ
6.6kΩ
2kΩ
1.1kΩ
V
ABSOLUTE MAXIMUM RATINGS
Symbol
IR
IF
Parameter
LM236
LM336,B
15
10
15
10
–25 to +85
0 to +70
Current
Reverse
Forward
Unit
mA
Toper
Operating Free-air Temperature Range
Tstg
Storage Temperature Range
–65 to +150
o
C
o
C
ELECTRICAL CHARACTERISTICS
LM236
-25oC ≤ Tamb ≤ +85oC
LM336,B
0oC ≤ Tamb ≤ +70oC
(unless otherwise specified)
Symbol
VR
Parameter
Typ.
Max.
Min.
Typ.
Max.
Unit
V
2.44
2.49
2.54
2.39
2.44
2.49
2.49
2.59
2.54
mV
Reverse Breakdown Voltage Change with Current
(400µA ≤ IR ≤ 10mA)
o
Tamb = +25 C
Tmin. ≤ Tamb ≤ Tmax.
2.6
3
6
10
2.6
3
10
12
Reverse Dynamic Impedance (IR = 1mA)
Tamb = +25oC
Tmin. ≤ Tamb ≤ Tmax.
0.2
0.4
0.6
1
0.2
0.4
1
1.4
KVT
Temperature Stability (VR = 2.49V, IR = 1mA)
3.5
9
1.8
6
KVH
Long Term Stability (Tamb = +25oC ±0.1oC, IR = 1mA)
ZD
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Min.
LM336,B
Reverse Breakdown Voltage
o
(Tamb = +25 C, IR = 1mA)
LM236, LM336
LM336B
∆VR
LM236
Ω
mV
ppm
20
20
LM236 - LM336,B
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LM236 - LM336,B
APPLICATION HINTS
The LM236, LM336 voltage references are easier to
use than zener diodes. Their low impedance and
wide current range facilitate biasing in any circuits.
Besides, the breakdown voltage or the temperature
coefficient can be adjusted so as to optimize the performance of the circuit.
Figure 1 represents a LM336 with a 10kΩ potentiometer to adjust the reverse breakdown voltage can
be adjusted without altering the temperature coeffiFigure 1 : The LM336 with Pot for Adjustment of
Breakdown Voltage
cient of the circuit. The adjustment range is generally sufficient to adjust the initial tolerance of the circuit and the inaccuracy of the amplifier circuit.
To obtain a lower temperature coefficient two diodes
can be connected in series as indicated in Figure 2.
When the circuit is adjusted to 2.49V the temperature coefficient is minimized.
For a correct temperature coefficient, the diodes
should be at the same ambient temperature as the
LM336. The value of R1 is not critical (2-20kΩ).
Figure 2 : Temperature Coefficient Adjustment
V
V
RS
RS
1N4148
LM336
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R1
10kΩ
LM336
R1
10kΩ
1N4148
LM236 - LM336,B
TYPICAL APPLICATIONS
Figure 3 : 2.5V Reference
Figure 4 : Wide Input Range Reference
Vi
+3.5V to +40V
+5V
2.5kΩ
LM334
68Ω
+2.5V
VO = +2.5V
LM336
LM336
Figure 5 : Precision Power Regulator with Low Temperature Coefficient
Vi
LM317
Input
VO
Output
ADJ
1.2kW
1N457
LM336
R1
375W
10kW
1N457
R2
2kW
Output adjust
Figure 6 : Adjustable Shunt Regulator
RS
VO
+6V to +40V
+5V to +40V
20kΩ
560Ω
2N2905
100kΩ
100pF
LM308A
20kΩ
LM336
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LM236 - LM336,B
Figure 7 : Linear Ohmmeter
V
LM334
35Ω
2.5kΩ
1%
25
kΩ
1%
10kΩ/V
250
kΩ
1%
2.5
MΩ
1%
LM336
10kΩ
calibrate
100kΩ/V
1kΩ/V
1MΩ/V
100pF
2
1
LM308A
8 6
3
Rx
Figure 8 : Bipolar Output Reference
+5V
5kΩ
2kΩ
+2V
LM336
10kΩ
1%
1.25V
10kΩ
1%
5kΩ
-5V
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VO
LM236 - LM336,B
Figure 9 : 5V Buffered Reference
Vi
+7V to +36V
20kΩ
1%
5.1kΩ
2
7
6
LM308
5V
8
3
4
10kΩ
CAL
LM336
100pF
20kΩ
1%
Figure 10 : Low Noise Buffered Reference
+5V
2.2kΩ
2
7
100pF
6
LM308A
20kΩ
2kΩ
3
200kΩ
10kΩ
CAL
LM336
4
10µF
10µF
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LM236 - LM336,B
PACKAGE MECHANICAL DATA
8 PINS - PLASTIC MICROPACKAGE (SO)
Dimensions
A
a1
a2
a3
b
b1
C
c1
D
E
e
e3
F
L
M
S
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Min.
Millimeters
Typ.
0.1
0.65
0.35
0.19
0.25
Max.
1.75
0.25
1.65
0.85
0.48
0.25
0.5
Min.
Inches
Typ.
0.026
0.014
0.007
0.010
Max.
0.069
0.010
0.065
0.033
0.019
0.010
0.020
0.189
0.228
0.197
0.244
0.004
45o (typ.)
4.8
5.8
5.0
6.2
1.27
3.81
3.8
0.4
0.050
0.150
4.0
1.27
0.6
0.150
0.016
8o (max.)
0.157
0.050
0.024
LM236 - LM336,B
PACKAGE MECHANICAL DATA
3 PINS - PLASTIC PACKAGE TO92
Dimensions
L
B
O1
C
K
O2
a
Min.
3.2
4.45
4.58
12.7
0.407
0.35
Millimeters
Typ.
1.27
3.7
5.00
5.03
0.5
Max.
Min.
4.2
5.2
5.33
0.126
0.1752
0.1803
0.5
0.016
0.0138
0.508
Inches
Typ.
0.05
0.1457
0.1969
0.198
0.1654
0.2047
0.2098
0.0197
0.02
Max.
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which
may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON
Microelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes
and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical
components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics.
© 1997 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved
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