LM4041

PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES

LM4041

5 of 7

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December 2010

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Application Information

In a conventional shunt regulator application (Figure 1), an

when the supply voltage is at its minimum and the load

current is at its maximum value. When the supply voltage

large enough so that the current flowing through the

LM4040 is less than 12 mA.

R

L

R

S

S

I

I

V

V

R

+

−

=

The LM4041 comes in two varients:

•

LM4041 with fixed 1.225V output

•

LM4041_ADJ with variable output voltage.

The LM4041-ADJ’s output voltage can be adjusted to any

value in the range of 1.24V through 10V. The output

voltage is set by the ratio of two external feedback

resistors as shown in Figure 2 and the internal reference

The output voltage is found using the equation:

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

+

×

=

1

2

R

O

R

R

1

V

V

Printed circuit board layout considerations

LM4041 with fixed output voltage in the SOT23 package

has the die attached to pin 1, which results in an electrical

contact between pin 2 and pin 1. Therefore, pin 1 of the

SOT23 package must be left floating or connected to

pin 2.

LM4041 with fixed output voltage 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.

Figure 1

Figure 2