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LM2677

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SNVS077J – MAY 2004 – REVISED JUNE 2016

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Copyright © 2004–2016, Texas Instruments Incorporated

Application Information (continued)

(1)

Assumes worst case maximum input voltage and load current for a given inductance value

The RMS current and working voltage (WV) ratings of the output capacitor are also important considerations. In a

typical step-down switching regulator, the inductor ripple current (set to be no more than 30% of the maximum

load current by the inductor selection) is the current that flows through the output capacitor. The capacitor RMS

current rating must be greater than this ripple current. The voltage rating of the output capacitor must be greater

than 1.3 times the maximum output voltage of the power supply. If operation of the system at elevated

temperatures is required, the capacitor voltage rating may be de-rated to less than the nominal room temperature

rating. Careful inspection of the manufacturer's specification for de-rating of working voltage with temperature is

important.

8.1.3 Input and Output Capacitor Codes

Table 1. Surface-Mount Capacitors(1)

CAPACITOR

REFERENCE

CODE

AVX TPS SERIES

SPRAGUE 594D SERIES

KEMET T495 SERIES

C (µF)

WV (V)

IRMS (A)

C (µF)

WV (V)

IRMS (A)

C (µF)

WV (V)

IRMS (A)

C1

330

6.3

1.15

120

6.3

1.1

100

6.3

0.82

C2

100

10

1.1

220

6.3

1.4

220

6.3

1.1

C3

220

10

1.15

68

10

1.05

330

6.3

1.1

C4

47

16

0.89

150

10

1.35

100

10

1.1

C5

100

16

1.15

47

16

1

150

10

1.1

C6

33

20

0.77

100

16

1.3

220

10

1.1

C7

68

20

0.94

180

16

1.95

33

20

0.78

C8

22

25

0.77

47

20

1.15

47

20

0.94

C9

10

35

0.63

33

25

1.05

68

20

0.94

C10

22

35

0.66

68

25

1.6

10

35

0.63

C11

—

—

—

15

35

0.75

22

35

0.63

C12

—

—

—

33

35

1

4.7

50

0.66

C13

—

—

—

15

50

0.9

—

—

—

(1)

Assumes worst case maximum input voltage and load current for a given inductance value

Table 2. Through-Hole Capacitors(1)

CAPACITOR

REFERENCE

CODE

SANYO OS-CON SA SERIES

SANYO MV-GX SERIES

NICHICON PL SERIES

PANASONIC HFQ SERIES

C (µF)

WV (V)

IRMS

(A)

C (µF)

WV (V)

IRMS

(A)

C (µF)

WV (V)

IRMS

(A)

C (µF)

WV (V)

IRMS

(A)

C1

47

6.3

1

1000

6.3

0.8

680

10

0.8

82

35

0.4

C2

150

6.3

1.95

270

16

0.6

820

10

0.98

120

35

0.44

C3

330

6.3

2.45

470

16

0.75

1000

10

1.06

220

35

0.76

C4

100

10

1.87

560

16

0.95

1200

10

1.28

330

35

1.01

C5

220

10

2.36

820

16

1.25

2200

10

1.71

560

35

1.4

C6

33

16

0.96

1000

16

1.3

3300

10

2.18

820

35

1.62

C7

100

16

1.92

150

35

0.65

3900

10

2.36

1000

35

1.73

C8

150

16

2.28

470

35

1.3

6800

10

2.68

2200

35

2.8

C9

100

20

2.25

680

35

1.4

180

16

0.41

56

50

0.36

C10

47

25

2.09

1000

35

1.7

270

16

0.55

100

50

0.5

C11

—

—

—

220

63

0.76

470

16

0.77

220

50

0.92

C12

—

—

—

470

63

1.2

680

16

1.02

470

50

1.44

C13

—

—

—

680

63

1.5

820

16

1.22

560

50

1.68

C14

—

—

—

1000

63

1.75

1800

16

1.88

1200

50

2.22

C15

—

—

—

—

—

—

220

25

0.63

330

63

1.42