LTC3621/LTC3621-2

11

3621f

For more information www.linear.com/LTC3621

applicaTions inForMaTion

produce the most improvement. Percent efficiency can

be expressed as:

% Efficiency = 100% – (L1 + L2 + L3 +…)

where L1, L2, etc. are the individual losses as a percent-

age of input power. Although all dissipative elements in

the circuit produce losses, three main sources usually

losses, 2) switching and biasing losses, 3) other losses.

In continuous mode, the average output current flows

through inductor L but is “chopped” between the

internal top and bottom power MOSFETs. Thus, the

series resistance looking into the SW pin is a function

cycle (DC) as follows:

obtained from the Typical Performance Characteristics

Table 1. Inductor Selection Table

INDUCTOR

INDUCTANCE

(µH)

DCR

(mΩ)

MAX CURRENT

(A)

DIMENSIONS

(mm)

HEIGHT

(mm)

MANUFACTURER

IHLP-1616BZ-11 Series

1.0

2.2

4.7

24

61

95

4.5

3.25

1.7

4.3 × 4.7

4.3 × 4.7

4.3 × 4.7

2

2

2

Vishay

www.vishay.com

IHLP-2020BZ-01 Series

1

2.2

3.3

4.7

5.6

6.8

18.9

45.6

79.2

108

113

139

7

4.2

3.3

2.8

2.5

2.4

5.4 × 5.7

5.4 × 5.7

5.4 × 5.7

5.4 × 5.7

5.4 × 5.7

5.4 × 5.7

2

2

2

2

2

2

FDV0620 Series

1

2.2

3.3

4.7

18

37

51

68

5.7

4

3.2

2.8

6.7 × 7.4

6.7 × 7.4

6.7 × 7.4

6.7 × 7.4

2

2

2

2

Toko

www.toko.com

MPLC0525L Series

1

1.5

2.2

16

24

40

6.4

5.2

4.1

6.2 × 5.4

6.2 × 5.4

6.2 × 5.4

2.5

2.5

2.5

NEC/Tokin

www.nec-tokin.com

HCP0703 Series

1

1.5

2.2

3.3

4.7

6.8

8.2

9

14

18

28

37

54

64

11

9

8

6

5.5

4.5

4

7 × 7.3

7 × 7.3

7 × 7.3

7 × 7.3

7 × 7.3

7 × 7.3

7 × 7.3

3

3

3

3

3

3

3

Cooper Bussmann

www.cooperbussmann.com

RLF7030 Series

1

1.5

2.2

3.3

4.7

6.8

8.8

9.6

12

20

31

45

6.4

6.1

5.4

4.1

3.4

2.8

6.9 × 7.3

6.9 × 7.3

6.9 × 7.3

6.9 × 7.3

6.9 × 7.3

6.9 × 7.3

3.2

3.2

3.2

3.2

3.2

3.2

TDK

www.tdk.com

WE-TPC 4828 Series

1.2

1.8

2.2

2.7

3.3

3.9

4.7

17

20

23

27

30

47

52

3.1

2.7

2.5

2.35

2.15

1.72

1.55

4.8 × 4.8

4.8 × 4.8

4.8 × 4.8

4.8 × 4.8

4.8 × 4.8

4.8 × 4.8

4.8 × 4.8

2.8

2.8

2.8

2.8

2.8

2.8

2.8

Würth Elektronik

www.we-online.com