LM4431M3-2.5/NOPB National Semiconductor, LM4431M3-2.5/NOPB Datasheet - Page 4

• Manufacturer Part Number: LM4431M3-2.5/NOPB
• Description: IC VREF PREC MICROPWR SOT23-3
• Manufacturer: National Semiconductor

Specifications of LM4431M3-2.5/NOPB

• Reference Type: Shunt
• Voltage - Output: 2.5V
• Tolerance: ±2%
• Temperature Coefficient: 30ppm/°C
• Number Of Channels: 1
• Current - Cathode: 45µA
• Current - Output: 15mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Current - Quiescent: -
• Other names: LM4431M3-2.5; LM4431M3-2.5TR

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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
ply voltage and the LM4431. R
Typical Applications
S
) is connected between the sup-
S
determines the current that
FIGURE 1. Shunt Regulator
4
flows through the load (I
current and supply voltage may vary, R
enough to supply at least the minimum acceptable I
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
be large enough so that the current flowing through the
LM4431 is less than 15 mA.
R
operating current, (I
breakdown voltage, V
DS011374-9
S
is determined by the supply voltage, (V
DS011374-8
L
R
and I
.
L
) and the LM4431 (I
Q
), and the LM4431’s reverse
L
is at its minimum, R
S
should be small
S
), the load and
Q
). Since load
S
Q
should
to the