µA723

PRECISION VOLTAGE REGULATORS

SLVS057D – AUGUST 1972 – REVISED JULY 1999

4

POST OFFICE BOX 655303

APPLICATION INFORMATION

Table 1. Resistor Values (k

Ω) for Standard Output Voltages

OUTPUT

VOLTAGE

APPLICABLE

FIGURES

FIXED OUTPUT

±5%

OUTPUT ADJUSTABLE

±10%

(SEE NOTE 6)

(V)

(SEE NOTE 5)

R1

(k

Ω)

R2

(k

Ω)

R1

(k

Ω)

P1

(k

Ω )

P2

(k

Ω )

3.0

1, 5, 6, 9, 11, 12 (4)

4.12

3.01

1.8

0.5

1.2

3.6

1, 5, 6, 9, 11, 12 (4)

3.57

3.65

1.5

0.5

1.5

5.0

1, 5, 6, 9, 11, 12 (4)

2.15

4.99

0.75

0.5

2.2

6.0

1, 5, 6, 9, 11, 12 (4)

1.15

6.04

0.5

0.5

2.7

9.0

2, 4, (5, 6, 9, 12)

1.87

7.15

0.75

1.0

2.7

12

2, 4, (5, 6, 9, 12)

4.87

7.15

2.0

1.0

3.0

15

2, 4, (5, 6, 9, 12)

7.87

7.15

3.3

1.0

3.0

28

2, 4, (5, 6, 9, 12)

21.0

7.15

5.6

1.0

2.0

45

7

3.57

48.7

2.2

10

39

75

7

3.57

78.7

2.2

10

68

100

7

3.57

105

2.2

10

91

250

7

3.57

255

2.2

10

240

–6

(see Note 7)

3, 10

3.57

2.43

1.2

0.5

0.75

–9

3, 10

3.48

5.36

1.2

0.5

2.0

–12

3, 10

3.57

8.45

1.2

0.5

3.3

–15

3, 10

3.57

11.5

1.2

0.5

4.3

–28

3, 10

3.57

24.3

1.2

0.5

10

–45

8

3.57

41.2

2.2

10

33

–100

8

3.57

95.3

2.2

10

91

–250

8

3.57

249

2.2

10

240

NOTES:

5. The R1/R2 divider can be across either VO or V(ref). If the divider is across

V(ref), use the figure numbers without parentheses. If the divider is across

VO, use the figure numbers in parentheses.

6. To make the voltage adjustable, the R1/R2 divider shown in the figures must

be replaced by the divider shown below.

R1

P1

R2

Adjustable Output Circuit

7. For Figures 3, 8, and 10, the device requires a minimum of 9 V between VCC+

and VCC– when VO is equal to or more positive than –9 V.