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LM236 LM336,B
2.5V VOLTAGE REFERENCES
. . . . .
LOW TEMPERATURE COEFFICIENT WIDE OPERATING CURRENT OF 400µA TO 10mA 0.2 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 0.2. A third pin enables adjusting the reference voltage and the temperature coefficient. PIN CONNECTIONS
TO92 (Bottom view)
ADJ V+ VV+ 8
ORDER CODES
Part num- Temperature Range ber LM236 LM336,B 25oC, +85oC 0 C, +70 C
o o
Package Z · · D · ·
SO8 (Top view)
NC 7 NC 6 ADJ 5
1 NC
2 NC
3 NC
4 V
October 1997
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LM236 - LM336,B
SCHEMATIC DIAGRAM
V
50k
24k 24k 6.6k
3pF 10k
6pF
600
30k
ADJ
6.6k
2k
1.1k V
ABSOLUTE MAXIMUM RATINGS
Symbol IR IF Toper Tstg Current Reverse Forward Operating Free-air Temperature Range Storage Temperature Range Parameter LM236 15 10 25 to +85 65 to +150 LM336,B 15 10 0 to +70
o o
Unit mA
C C
ELECTRICAL CHARACTERISTICS LM236 -25oC Tamb +85oC LM336,B 0oC Tamb +70oC (unless otherwise specified)
Symbol VR Parameter Reverse Breakdown Voltage o (Tamb = +25 C, IR = 1mA) LM236, LM336 LM336B VR Reverse Breakdown Voltage Change with Current (400µA IR 10mA) o Tamb = +25 C Tmin. Tamb Tmax. Reverse Dynamic Impedance (IR = 1mA) Tamb = +25oC Tmin. Tamb Tmax. Temperature Stability (VR = 2.49V, IR = 1mA) Long Term Stability (Tamb = +25oC ±0.1oC, IR = 1mA) 2.44 2.49 2.54 2.39 2.44 2.49 2.49 2.59 2.54 mV 2.6 3 0.2 0.4 3.5 20 6 10 0.6 1 9 2.6 3 0.2 0.4 1.8 20 10 12 1 1.4 6 LM236 Min. Typ. Max. Min. LM336,B Typ. Max. Unit V
ZD
KVT KVH
mV ppm
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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 10k 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 (2-20k). Figure 2 : Temperature Coefficient Adjustment
V RS
V RS
1N4148 R1 10k 1N4148
LM336
R1 10k
LM336
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LM236 - LM336,B
TYPICAL APPLICATIONS Figure 3 : 2.5V Reference
Figure 4 : Wide Input Range Reference
Vi +3.5V to +40V
+5V 2.5k +2.5V LM336
LM334 68 VO = +2.5V LM336
Figure 5 : Precision Power Regulator with Low Temperature Coefficient
LM317 Input Output ADJ
Vi
VO 1.2kW
1N457 LM336 10kW 1N457
R1 375W R2 2kW Output adjust
Figure 6 : Adjustable Shunt Regulator
RS +6V to +40V 20k 560 2N2905 100k 100pF VO +5V to +40V
LM308A
20k LM336
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Figure 7 : Linear Ohmmeter
V
LM334 35
2.5k 1%
25 k 1% 10k/V
250 k 1%
2.5 M 1% 100k/V 1M/V
LM336
10k calibrate
1k/V
100pF
2 1 8 6
LM308A
3
VO
Rx
Figure 8 : Bipolar Output Reference
+5V 5k
2k +2V LM336
10k 1% 1.25V 10k 1%
5k
-5V
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Figure 9 : 5V Buffered Reference
Vi +7V to +36V
20k 1%
5.1k
2
7
LM308
3 4 8
6
5V
10k CAL
LM336
20k 1%
100pF
Figure 10 : Low Noise Buffered Reference
+5V
2.2k
2
7
100pF
6 4
LM308A 20k 2k
3
200k 10k CAL LM336
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
Min. 0.1 0.65 0.35 0.19 0.25 4.8 5.8
Millimeters Typ.
Max. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45o (typ.) 5.0 6.2
Min. 0.004 0.026 0.014 0.007 0.010 0.189 0.228
Inches Typ.
Max. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.197 0.244
1.27 3.81 3.8 0.4 4.0 1.27 0.6 8o (max.) 0.150 0.016
0.050 0.150 0.157 0.050 0.024
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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. 4.2 5.2 5.33 0.508
Min. 0.126 0.1752 0.1803 0.5 0.016 0.0138
Inches Typ. 0.05 0.1457 0.1969 0.198 0.0197
Max. 0.1654 0.2047 0.2098 0.02
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 SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
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