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2.5V VOLTAGE REFERENCES
LM236
LM336,B
2.5V VOLTAGE REFERENCES
.
WIDE OPERATING CURRENT OF 400
m
ATO
.
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 op-
erate like 2.5V zener diodes with a low temperature
coefficient and a dynamic impedance of 0.2
ORDER CODES
Part num-
ber
Temperature Range
Package
Z
D
.A
third pin enables adjusting the reference voltage
and the temperature coefficient.
W
LM236
–25
o
C, +85
o
C
•
•
LM336,B
0
o
C, +70
o
C
•
•
PIN CONNECTIONS
TO92
(Bottom view)
SO8
(Top view)
V
+
NC
NC
ADJ
ADJ
V
+
V
-
8
7
6
5
1
2
3
4
V
-
NC
NC
NC
October 1997
1/9
.
LOW TEMPERATURE COEFFICIENT
.
0.2
W
DYNAMIC IMPEDANCE
10mA
LM236 - LM336,B
SCHEMATIC DIAGRAM
V
50k
W
24k
W
24k
W
6.6k
W
3pF
10k
W
6pF
600
W
30k
W
ADJ
6.6k
W
2k
W
1.1k
W
V
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
LM236
LM336,B
Unit
I
R
I
F
Current
Reverse
Forward
15
10
15
10
mA
T
oper
Operating Free-air Temperature Range
–25 to +85
0 to +70
o
C
T
stg
Storage Temperature Range
–65 to +150
o
C
ELECTRICAL CHARACTERISTICS
LM236
-25
o
C
3
T
amb
3
+85
o
C
LM336,B
0
o
C
3
T
amb
3
+70
o
C
(unless otherwise specified)
Symbol
Parameter
LM236
LM336,B
Unit
Min. Typ. Max. Min. Typ. Max.
V
R
Reverse Breakdown Voltage
(T
amb
= +25
o
C, I
R
= 1mA)
V
LM236, LM336
LM336B
2.44 2.49 2.54 2.39
2.44
2.49
2.49
2.59
2.54
D
V
R
Reverse Breakdown Voltage Change with Current
(400
mV
10mA)
T
amb
= +25
o
C
T
min.
A
3
I
R
3
2.6
3
6
10
2.6
3
10
12
3
T
amb
3
T
max.
Z
D
Reverse Dynamic Impedance (I
R
=1mA)
T
amb
= +25
o
C
T
min.
W
0.2
0.4
0.6
1
0.2
0.4
1
1.4
3
T
amb
3
T
max.
K
VT
Temperature Stability (V
R
= 2.49V, I
R
= 1mA)
3.5
9
1.8
6
mV
K
VH
Long Term Stability (T
amb
= +25
o
C
±
0.1
o
C, I
R
= 1mA)
ppm
20
20
2/9
m
LM236 - LM336,B
3/9
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 adjustedso as to optimize the per-
formance of the circuit.
Figure 1 represents a LM336 with a 10k
W
cient of the circuit. The adjustment range is gener-
ally sufficient to adjust the initial tolerance of the cir-
cuit and the inaccuracy of the amplifier circuit.
To obtain a lower temperaturecoefficient two diodes
can be connected in series as indicated in Figure 2.
When the circuit is adjusted to 2.49V the tempera-
ture 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
W
).
Figure 1 :
The LM336 with Pot for Adjustment of
Breakdown Voltage
Figure 2 :
Temperature Coefficient Adjustment
V
V
R
S
R
S
1N4148
R1
10k
W
LM336
R1
10k
LM336
1N4148
4/9
potenti-
ometer to adjust the reverse breakdown voltage can
be adjusted without altering the temperature coeffi-
W
LM236 - LM336,B
TYPICAL APPLICATIONS
Figure 3 :
2.5V Reference
Figure 4 :
Wide Input Range Reference
+5V
V
i
+3.5V to +40V
2.5k
W
LM334
+2.5V
68
W
LM336
V = +2.5V
LM336
Figure 5 :
Precision Power Regulator with Low Temperature Coefficient
LM31 7
V
i
Input
Output
V
O
ADJ
1.2k
W
1N457
R1
375
W
LM336
10k
W
1N457
R2
2k
W
Ou tput a djus t
Figure 6 :
Adjustable Shunt Regulator
+6V to +40V
R
S
V
O
+5V to +40V
20k
W
560
W
2N2905
100k
W
100pF
LM308A
20k
W
LM336
5/9
O
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