LM4040(2010) データシートの表示（PDF） - Diodes Incorporated.
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LM4040 Datasheet PDF : 10 Pages
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A Product Line of
Diodes Incorporated
LM4040
Application Information
In a conventional shunt regulator application (Figure 1), an external series resistor (RS) is connected between the supply
voltage, VS, and the LM4040.
VS
IR +
IL
RS
IL
VR
IR
RS determines the current that flows through the load (IL) and the LM4040 (IR). Since load current and
supply voltage may vary, RS should be small enough to supply at least the minimum acceptable IR to the
LM4040 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 IL is at its minimum, RS should be large enough so that
the current flowing through the LM4040 is less than 15 mA.
RS is determined by the supply voltage, (VS), the load and operating current, (IL and IR), and the
LM4040’s reverse breakdown voltage, VR.
RS
=
VS
IL
− VR
+ IR
Printed circuit board layout considerations
LM4040s in the SOT23 package have the die attached to pin 1, which results in an electrical contact between pin 2 and pin
3. Therefore, pin 1 of the SOT-23 package must be left floating or connected to pin 2.
LM4040s in the SC70-5 package have the die attached to pin 2, which results in an electrical contact between pin 2 and pin
1. Therefore, pin 2 must be left floating or connected to pin1.
Ordering Information
25°C
Tol
0.2%
0.5%
1%
Voltage
(V)
2.5
3.0
5.0
2.5
3.0
5.0
2.5
3.0
5.0
Order Code
LM4040B25FTA
LM4040B25H5TA
LM4040B30FTA
LM4040B30H5TA
LM4040B50FTA
LM4040B50H5TA
LM4040C25FTA
LM4040C25H5TA
LM4040C30FTA
LM4040C30H5TA
LM4040C50FTA
LM4040C50H5TA
LM4040D25FTA
LM4040D25H5TA
LM4040D30FTA
LM4040D30H5TA
LM4040D50FTA
LM4040D50H5TA
Package
SOT23
SC70-5
SOT23
SC70-5
SOT23
SC70-5
SOT23
SC70-5
SOT23
SC70-5
SOT23
SC70-5
SOT23
SC70-5
SOT23
SC70-5
SOT23
SC70-5
Part
Mark
R2B
R2B
R3B
R3B
R5B
R5B
R2C
R2C
R3C
R3C
R5C
R5C
R2D
R2D
R3D
R3D
R5D
R5D
Reel
Size
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
Tape Width
8mm
8mm
8mm
8mm
8mm
8mm
8mm
8mm
8mm
8mm
8mm
8mm
8mm
8mm
8mm
8mm
8mm
8mm
Quantity
per Reel
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
LM4040
Document number: DS33195 Rev. 5 - 2
8 of 10
www.diodes.com
November 2010
© Diodes Incorporated
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