LM4040 datasheet(8/10 Pages) DIODES

8 / 10 page

LM4040

Document number: DS33195 Rev. 5 - 2

8 of 10

www.diodes.com

November 2010

A Product Line of

Diodes Incorporated

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.

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.

−

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

Voltage

(V)

Order Code

Package

Part

Mark

Reel

Size

Tape Width

Quantity

per Reel

0.2%

2.5

LM4040B25FTA

SOT23

R2B

7”, 180mm

8mm

3000

LM4040B25H5TA

SC70-5

R2B

7”, 180mm

8mm

3000

3.0

LM4040B30FTA

SOT23

R3B

7”, 180mm

8mm

3000

LM4040B30H5TA

SC70-5

R3B

7”, 180mm

8mm

3000

5.0

LM4040B50FTA

SOT23

R5B

7”, 180mm

8mm

3000

LM4040B50H5TA

SC70-5

R5B

7”, 180mm

8mm

3000

0.5%

2.5

LM4040C25FTA

SOT23

R2C

7”, 180mm

8mm

3000

LM4040C25H5TA

SC70-5

R2C

7”, 180mm

8mm

3000

3.0

LM4040C30FTA

SOT23

R3C

7”, 180mm

8mm

3000

LM4040C30H5TA

SC70-5

R3C

7”, 180mm

8mm

3000

5.0

LM4040C50FTA

SOT23

R5C

7”, 180mm

8mm

3000

LM4040C50H5TA

SC70-5

R5C

7”, 180mm

8mm

3000

2.5

LM4040D25FTA

SOT23

R2D

7”, 180mm

8mm

3000

LM4040D25H5TA

SC70-5

R2D

7”, 180mm

8mm

3000

3.0

LM4040D30FTA

SOT23

R3D

7”, 180mm

8mm

3000

LM4040D30H5TA

SC70-5

R3D

7”, 180mm

8mm

3000

5.0

LM4040D50FTA

SOT23

R5D

7”, 180mm

8mm

3000

LM4040D50H5TA

SC70-5

R5D

7”, 180mm

8mm

3000

IR +

LM4040 Datasheet(PDF) 8 Page - Diodes Incorporated

LM4040 Datasheet(HTML) 8 Page - Diodes Incorporated

Html Pages

1 2 3 4 5 6 7 8 9 10

Datasheet Download

Link URL