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參數(shù)資料
| 型號： | LM4431M3-2.5 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Micropower Shunt Voltage Reference |
| 中文描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO3 |
| 封裝： | PLASTIC, SOT-23, 3 PIN |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 130K |
| 代理商： | LM4431M3-2.5 |
Functional Block Diagram
Applications Information
The LM4431 is a micro-power curvature-corrected 2.5V
bandgap shunt voltage reference. For space critical applica-
tions, the LM4431 is available in the sub-miniature SOT-23
surface-mount package. The LM4431 has been designed for
stable operation without the need of an external capacitor
connected between the “+” pin and the “” pin. If, however, a
bypass capacitor is used, the LM4431 remains stable. The
operating current range is 100 μA to 15 mA.
The LM4431’s SOT-23 package has a parasitic Schottky di-
ode between pin 2 () and pin 3 (Die attach interface con-
tact). Therefore, pin 3 of the SOT-23 package must be left
floating or connected to pin 2.
In a conventional shunt regulator application (Figure 1) , an
external series resistor (R
) is connected between the sup-
ply voltage and the LM4431. R
S
determines the current that
Typical Applications
flows through the load (I
) and the LM4431 (I
). Since load
current and supply voltage may vary, R
should be small
enough to supply at least the minimum acceptable I
to the
LM4431 even when the supply voltage is at its minimum and
the load current is at its maximum value. When the supply
voltage is at its maximum and I
is at its minimum, R
should
be large enough so that the current flowing through the
LM4431 is less than 15 mA.
R
is determined by the supply voltage, (V
), the load and
operating current, (I
L
and I
Q
), and the LM4431’s reverse
breakdown voltage, V
R
.
DS011374-8
DS011374-9
FIGURE 1. Shunt Regulator
www.national.com
4
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