Elektronische Bauelemente

ST2123

CMOS Positive

Voltage Regulator

01-Jun-2002 Rev. A

Page 8 of 8

http://www.SeCoSGmbH.com/

Any changing of specification will not be informed individual

External Resistor Divider Table

1

2

5

10

20

50

100

200

500

1000

Vout

R2(K Ohm)=(1.215*R1(K Ohm))/(VOUT-1.215)

3.35

0.57

1.14

2.85

5.69

11.38

28.45

56.91

113.82 284.54 569.09

3.40

0.56

1.11

2.78

5.56

11.12

27.80

55.61

111.21

278.03 556.06

3.45

0.54

1.09

2.72

5.44

10.87

27.18

54.36

108.72 271.81 543.62

3.50

0.53

1.06

2.66

5.32

10.63

26.59

53.17

106.35 265.86 531.73

3.55

0.52

1.04

2.60

5.20

10.41

26.02

52.03

104.07 260.17 520.34

3.60

0.51

1.02

2.55

5.09

10.19

25.47

50.94

101.89 254.72 509.43

3.65

0.50

1.00

2.49

4.99

9.98

24.95

49.90

99.79

249.49 498.97

3.70

0.49

0.98

2.44

4.89

9.78

24.45

48.89

97.79

244.47 488.93

3.75

0.48

0.96

2.40

4.79

9.59

23.96

47.93

95.86

239.64 479.29

3.80

0.47

0.94

2.35

4.70

9.40

23.50

47.00

94.00

235.01 470.02

3.85

0.46

0.92

2.31

4.61

9.22

23.06

46.11

92.22

230.55 461.10

3.90

0.45

0.91

2.26

4.53

90.5

22.63

45.25

90.50

226.26 452.51

3.95

0.44

0.89

2.22

4.44

8.88

22.21

44.42

88.85

222.12 444.24

4.00

0.44

0.87

2.18

4.36

8.73

21.81

43.63

87.25

218.13 436.27

4.05

0.43

0.86

2.14

4.29

8.57

21.43

42.86

85.71

214.29 428.57

4.10

0.42

0.84

2.11

4.21

8.42

21.06

42.11

84.23

210.57 421.14

4.15

0.41

0.83

2.07

4.14

8.28

20.70

41.40

82.79

206.98 413.97

4.20

0.41

0.81

2.04

4.07

8.14

20.35

40.70

81.41

203.52 407.04

4.25

0.40

0.80

2.00

4.00

8.01

20.02

40.03

80.07

200.16 400.33

4.30

0.39

0.79

1.97

3.94

7.88

19.69

39.38

78.77

196.92 393.84

4.35

0.39

0.78

1.97

3.88

7.75

19.38

38.76

77.51

193.78 387.56

4.40

0.38

0.76

1.91

3.81

7.63

19.07

38.15

76.30

190.74 381.48

4.45

0.38

0.75

1.88

3.76

7.51

18.78

37.56

75.12

187.79 375.58

4.50

0.37

0.74

1.85

3.70

7.40

18.49

36.99

73.97

184.93 369.86

4.55

0.36

0.73

1.82

3.64

7.29

18.22

36.43

72.86

182.16 364.32

4.60

0.36

0.72

1.79

3.59

7.18

17.95

35.89

71.79

179.47 358.94

4.65

0.35

0.71

1.77

3.54

7.07

17.69

35.37

70.74

176.86 353.71

4.70

0.35

0.70

1.74

3.49

6.97

17.43

34.86

69.73

174.32 348.64

4.75

0.34

0.69

1.72

3.44

6.87

17.19

34.37

68.74

171.85 343.71

4.80

0.34

0.68

1.69

3.39

6.78

16.95

33.89

67.78

169.46 338.91

4.85

0.33

0.67

1.67

3.34

6.69

16.71

33.43

66.85

167.13 334.25

4.90

0.33

0.66

1.65

3.30

6.59

16.49

32.97

65.94

164.86 329.72

4.95

0.33

0.65

1.63

3.25

6.51

16.27

32.53

65.06

162.65 325.30

5.00

0.32

0.64

1.61

3.21

6.42

16.05

32.10

64.02

160.50 321.00

Note: Small load (greater than 2mA) is necessary as R1 or R2 is large than 50Kohm. Otherwise, output voltage probably cannot be

pulled down to 0V on disable mode