Fairchild Semiconductor LM336BX25 Datasheet
©2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1
Features
• Low Temperature Coefficient
• Guaranteed Temperature Stability 4mV Typical
•0.2Ω
D
ynamic Impedan c e
• ±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 s upplies 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 < TA < +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
TA = +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
TA = +25°C
400uA ≤ I
R
≤ 10mA
- 2.6 10 - 2.6 6 mV
Reverse Dynamic
Impedance
Z
D
TA = +25°C
I
R
= 1mA
- 0.2 1 - 0.2 0.6 Ω
Temperature Stability ST
T
IR = 1mA - 1.8 6 - 1.8 6 mV
Reverse Breakdown
Change with Current
∆V
R
/∆IR400uA ≤ I
R
≤ 10mA-312- 310 mV
Reverse Dynamic
Impedance
Z
D
IR = 1mA - 0.4 1.4 - 0.4 1.0 Ω
Long Term Stability
In Reference Voltage
ST I
R
= 1mA - 20 - - 20 - ppm/Khr
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