LM236
LM336,B
2.5V VOLTAGE REFERENCES
s
LOW TEMPERATURE COEFFICIENT
s
WIDE OPERATING CURRENT OF 400µA
TO 10mA
s
0.2Ω DYNAMIC IMPEDANCE
s
GUARANTEED TEMPERATURE STABILITY
s
FAST TURN-ON
Z
TO92
(Plastic Package)
D
SO8
(Plastic Micropackage)
DESCRIPTION
The LM236 and LM336 are precision 2.5V regula-
tor diodes. These voltage reference monolithic ICs
operate like 2.5V zener diodes with a low temper-
ature coefficient and a dynamic impedance of
0.2Ω. A third pin enables adjusting the reference
voltage and the temperature coefficient.
PIN CONNECTIONS
(top view)
TO92
(Top view)
ORDER CODE
Part Number
LM236
LM336,B
Temperature
Range
-25°C, +85°C
0°C, +70°C
Package
Z
•
•
D
•
•
Z =
TO92 Plastic package - also available in Bulk (Z), Tape & Reel (ZT)
and Ammo Pack (AP)
D =
Small Outline Package (SO) - also available in Tape & Reel (DT)
SO8
(Top view)
V+
NC
NC
ADJ
ADJ
v+
v-
8
7
6
5
1-
2-
3-
4-
5-
6-
7-
8-
NC
NC
NC
V-
ADJ
NC
NC
V+
1
NC
2
NC
3
NC
4
V+
May 2003
1/10
LM236 - LM336,B
SCHEMATIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
I
R
I
F
Toper
T
Stg
Current
Reverse
Forward
Operating Free-air Temperature Range
Storage Temperature Range
-25 to +85
-65 to +150
Parameter
LM236
15
10
0 to +70
LM336,B
Unit
mA
°C
°C
ELECTRICAL CHARACTERISTICS
LM236
Symbol
Parameter
Min.
Reference Breakdown Voltage
T
amb
= +25°C, I
R
= 1mA
LM236, LM336
LM336B
Reverse Breakdown Voltage Change with Current
400µA
≤
I
R
≤
10mA
T
amb
= +25°C
T
min.
≤
T
amb
≤
T
max.
Reverse Dynamic Impedance (I
R
= 1mA)
T
amb
= +25°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)
Typ.
Max.
Min.
Typ.
Max.
LM336,B
Unit
V
R
2.44
2.49
2.54
2.39
2.44
2.49
2.49
2.59
2.54
V
∆V
R
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
mV
Z
D
K
VT
K
VH
Ω
mV
ppm
2/10
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 cir-
cuits. Besides, the breakdown voltage or the tem-
perature coefficient can be adjusted so as to opti-
mize the performance of the circuit.
Figure 1 represents a LM336 with a 10kΩ potenti-
ometer to adjust the reverse breakdown voltage
which can be adjusted without altering the temper-
ature coefficient of the circuit. The adjustment
range is generally sufficient to adjust the initial tol-
erance of the circuit and the inaccuracy of the am-
plifier circuit.
To obtain a lower temperature coefficient two di-
odes 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).
4/10
Microcontroller MCU
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