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 op-
erate 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.
PIN CONNECTIONS
TO92
(Bottom view)
ADJ
V+
V-
V+
8
ORDER CODES
Part num- Temperature Range
ber
LM236
LM336,B
–25 C, +85 C
0 C, +70 C
o
o
o
o
Package
Z
•
•
D
•
•
SO8
(Top view)
NC
7
NC
6
ADJ
5
1
NC
2
NC
3
NC
4
-
V
October 1997
1/9
LM236 - LM336,B
SCHEMATIC DIAGRAM
V
50kΩ
24kΩ
24kΩ
6.6kΩ
3pF 10kΩ
6pF
600Ω
30kΩ
ADJ
6.6kΩ
2kΩ
1.1kΩ
V
ABSOLUTE MAXIMUM RATINGS
Symbol
I
R
I
F
T
oper
T
stg
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
-25
o
C
≤
T
amb
≤
+85
o
C
LM336,B
0
o
C
≤
T
amb
≤
+70
o
C
(unless otherwise specified)
Symbol
V
R
Parameter
Reverse Breakdown Voltage
o
(T
amb
= +25 C, I
R
= 1mA)
LM236, LM336
LM336B
∆V
R
Reverse Breakdown Voltage Change with Current
(400µA
≤
I
R
≤
10mA)
o
T
amb
= +25 C
T
min.
≤
T
amb
≤
T
max.
Reverse Dynamic Impedance (I
R
= 1mA)
T
amb
= +25
o
C
T
min.
≤
T
amb
≤
T
max.
Temperature Stability (V
R
= 2.49V, I
R
= 1mA)
Long Term Stability (T
amb
= +25 C
±0.1
C, I
R
= 1mA)
o
o
LM236
Min.
Typ.
Max.
Min.
LM336,B
Typ.
Max.
Unit
V
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
Ω
Z
D
K
VT
K
VH
mV
ppm
2/9
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 adjusted so as to optimize the per-
formance of the circuit.
Figure 1 represents a LM336 with a 10kΩ potenti-
ometer to adjust the reverse breakdown voltage can
be adjusted without altering the temperature coeffi-
Figure 1 :
The LM336 with Pot for Adjustment of
Breakdown Voltage
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 temperature coefficient 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 (2-20kΩ).
Figure 2 :
Temperature Coefficient Adjustment
V
R
S
V
R
S
1N4148
R1
10kΩ
1N4148
LM336
R1
10kΩ
LM336
4/9
LM236 - LM336,B
TYPICAL APPLICATIONS
Figure 3 :
2.5V Reference
Figure 4 :
Wide Input Range Reference
V
i
+3.5V to +40V
+5V
2.5kΩ
+2.5V
LM336
LM334
68Ω
V
O
= +2.5V
LM336
Figure 5 :
Precision Power Regulator with Low Temperature Coefficient
LM317
Input
Output
ADJ
V
i
V
O
1.2k
W
1N457
LM336
10k
W
1N457
R1
375
W
R2
2k
W
Output adjust
Figure 6 :
Adjustable Shunt Regulator
R
S
+6V to +40V
20kΩ
560Ω
2N2905
100kΩ
100pF
V
O
+5V to +40V
LM308A
20kΩ
LM336
5/9
stm32/stm8
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