©2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1
Features
· Low Temperature Coefficient
· Guaranteed Temperature Stability 4mV Typical
· 0.2
D
ynamic Impedance
· ±1.0% Initial Tolerance Available
· Easily Trimmed for Minimum Temperature Drift
Description
The LM336-2.5/LM336B-2.5 integrated circuits are
precision 2.5V shunt regulators. The monolithic IC voltage
reference operates as a low temperature coefficient 2.5V
zener with 0.2W dynamic impedance. A third terminal on
the LM336-2.5/LM336B-2.5 allows the reference voltage
and temperature coefficient to be trimmed easily. LM336-
2.5/LM336B-2.5 are useful as a precision 2.5V low voltage
reference for digital voltmeters, power supplies or OP-AMP
circuitry. The 2.5V makes it convenient to obtain a stable
reference from low voltage supplies. Further, since the
LM336-2.5/LM336B-2.5 operate as shunt regulators, they
can be used as either a positive or negative voltage reference.
TO-92
1. Adj 2. + 3. -
1
Internal Block Diagram
2
1
3
+
_
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q11
Q12
Q13
Q14
Q15
Q16
Q17
Q18
R1
R2
R3
R4
R5 R6
R7
R9
R8
R10
C1
C2
ADJUST
LM336-2.5/LM336B-2.5
Programmable Shunt Regulator
LM336-2.5/LM336B-2.5
2
Absolute Maximum Ratings
Electrical Characteristics
(0
°
C < T
A
< +70
°
C, unless otherwise specified
)
Parameter
Symbol
Value
Unit
Reverse Current
I
R
15
mA
Forward Current
I
F
10
mA
Operating Temperature Range LM336-2.5/LM336B-2.5
T
OPR
0 ~ +70
°
C
Storage Temperature Range
T
STG
- 60 ~ +150
°
C
Parameter
Symbol
Conditions
LM336-2.5
LM336B-2.5
Unit
Min.
Typ. Max.
Min.
Typ.
Max.
Reverse Breakdown
Voltage
V
R
T
A
= +25
°
C
I
R
= 1mA
2.44
2.49
2.54 2.465
2.49
2.515
V
Reverse Breakdown
Change with Current
V
R
/
I
R
T
A
= +25
°
C
400uA
I
R
10mA
-
2.6
10
-
2.6
6
mV
Reverse Dynamic
Impedance
Z
D
T
A
= +25
°
C
I
R
= 1mA
-
0.2
1
-
0.2
0.6
Temperature Stability
ST
T
I
R
= 1mA
-
1.8
6
-
1.8
6
mV
Reverse Breakdown
Change with Current
V
R
/
I
R
400uA
I
R
10mA
-
3
12
-
3
10
mV
Reverse Dynamic
Impedance
Z
D
I
R
= 1mA
-
0.4
1.4
-
0.4
1.0
Long Term Stability
In Reference Voltage
ST
I
R
= 1mA
-
20
-
-
20
-
ppm/Khr
LM336-2.5/LM336B-2.5
3
Typical Performance Characteristics
Figure 1. Reverse Voltage Change
Figure 3. Temperature Drift
Figure 2. Reverse Characteristics
Figure 4. Forward Characteristics
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