MPM3620 – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR

MPM3620 Rev. 1.1

www.MonolithicPower.com

16

2/12/2015

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2015 MPS. All Rights Reserved.

APPLICATION INFORMATION

Setting the Output Voltage

The external resistor divider sets the output

voltage (see “Typical Application” on page 1).

Choose R1 (refer to Table 1); R2 is then given

by:

OUT

R1

R2

V

1

0.798V

=

−

Figure 7. Feedback Network

See Table 1 and Figure 7 for the feedback

network and a list of recommended feedback

network

parameters

for

common

output

voltages.

Table 1. Recommended Parameters for Common Output Voltages

(V)

(V)

(kΩ)

R1

(kΩ)

R2

(kΩ)

PFM

Ripple

(mV)

(9)

PWM

Ripple

(mV)

(10)

Load

Transient

(mV)

(11)

R1

(kΩ)

R2

(kΩ)

PFM

Ripple

(mV)

(9)

PWM

Ripple

(mV)

(10)

Load

Transient

(mV)

(11)

24

5

33.2 160 30.1

106

19.2

168

75 14.3

35

10.4

96

 

3.3

16.5 160

51

79

13.6

137

82 26.1

33

7.6

75

 

2.5

10

180 84.5

76

10.8

116

102 47.5

37

5.8

70

 

21

5

38.3 160 30.1

97

17.6

172

75 14.3

32

9.4

98

3.3

22.1 160

51

84

12.4

146

82 26.1

34

7

79

2.5

16.2 180 84.5

81

10

120

102 47.5

36

5.2

78

19

5

43.2 160 30.1

87

16.4

170

75 14.3

31

8.8

96

3.3

29.4 160

51

84

11.4

141

82 26.1

45

6.6

83

2.5

19.6 160

75

76

9.8

113

102 47.5

38

5

80

16

5

51.3 160 30.1

82

15.6

176

75 14.3

29

7.8

96

3.3

37.4 160

51

91

10.6

146

82 26.1

42

6

83

2.5

26.1 160

75

70

9.6

116

102 47.5

41

4.8

82

1.8

(12)

17.4 180 143

68

8.6

108

102

82

31

4

70

14

5

57.6 160 30.1

70

14.8

172

75 14.3

27

7.4

95

3.3

45.3 160

51

89

10.2

149

82 26.1

41

5.6

81

2.5

34

160

75

74

9.4

120

102 47.5

44

4.6

88

1.8

(12)

26.1 180 143

73

8.4

114

102

82

37

4.2

75

1.5

(12)

20.5 180 205

62

7.2

103

120 137

36

3.6

72

12

5

63.4 160 30.1

70

13.8

174

75 14.3

25

6.4

91

3.3

56

160

51

82

9.4

152

82 26.1

37

5.2

82

2.5

42.2 160

75

66

9

125

82 38.3

35

4.4

76

1.8

32.4 160 127

64

7.8

112

102

82

36

4

75

1.5

(12)

25.5 160 180

60

6.6

104

102 115

33

3.4

72

1.2

(12)

21

300 604

81

6.2

155

143 280

38

3

88