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LTC3559/LTC3559-1

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Table 2 Recommended Inductors

INDUCTOR TYPE

L (μH)

MAX IDC(A)

MAX DCR(

Ω)

SIZE IN MM (L

× W × H)

MANUFACTURER

DB318C

D312C

DE2812C

4.7

3.3

4.7

3.3

4.7

3.3

1.07

1.20

0.79

0.90

1.15

1.37

0.1

0.07

0.24

0.20

0.13*

0.105*

3.8

× 3.8 × 1.8

3.8

× 3.8 × 1.8

3.6

× 3.6 × 1.2

3.6

× 3.6 × 1.2

3.0

× 2.8 × 1.2

3.0

× 2.8 × 1.2

Toko

www.toko.com

CDRH3D16

CDRH2D11

CLS4D09

4.7

3.3

4.7

3.3

4.7

0.9

1.1

0.5

0.6

0.75

0.11

0.085

0.17

0.123

0.19

× 4 × 1.8

3.2

× 3.2 × 1.2

3.2

× 3.2 × 1.2

4.9

× 4.9 × 1

Sumida

www.sumida.com

SD3118

SD3112

SD12

SD10

4.7

3.3

4.7

3.3

4.7

3.3

4.7

3.3

1.3

1.59

0.8

0.97

1.29

1.42

1.08

1.31

0.162

0.113

0.246

0.165

0.117*

0.104*

0.153*

0.108*

3.1

× 3.1 × 1.8

3.1

× 3.1 × 1.8

3.1

× 3.1 × 1.2

3.1

× 3.1 × 1.2

5.2

× 5.2 × 1.2

5.2

× 5.2 × 1.2

5.2

× 5.2 × 1.0

5.2

× 5.2 × 1.0

Cooper

www.cooperet.com

LPS3015

4.7

3.3

1.1

1.3

0.2

0.13

3.0

× 3.0 × 1.5

3.0

× 3.0 × 1.5

Coilcraft

www.coilcraft.com

*Typical DCR

Buck Switching Regulator

Input/Output Capacitor Selection

Low ESR (equivalent series resistance) ceramic capaci-

tors should be used at both switching regulator outputs

as well as the switching regulator input supply. Only

X5R or X7R ceramic capacitors should be used because

they retain their capacitance over wider voltage and

temperature ranges than other ceramic types. A 10

μF

output capacitor is sufﬁcient for most applications.

For good transient response and stability the output

capacitor should retain at least 4

μF of capacitance over

operating temperature and bias voltage. The switching

regulator input supply should be bypassed with a 2.2

μF

capacitor. Consult manufacturer for detailed information

on their selection and speciﬁcations of ceramic capaci-

tors. Many manufacturers now offer very thin (< 1mm

tall) ceramic capacitors ideal for use in height-restricted

designs. Table 3 shows a list of several ceramic capacitor

manufacturers.

APPLICATIONS INFORMATION

Table 3: Recommended Ceramic Capacitor Manufacturers

AVX

(803) 448-9411

www.avxcorp.com

Murata

(714) 852-2001

www.murata.com

Taiyo Yuden

(408) 537-4150

www.t-yuden.com

TDK

(888) 835-6646

www.tdk.com

PCB Layout Considerations

As with all DC/DC regulators, careful attention must be

paid while laying out a printed circuit board (PCB) and to

component placement. The inductors, input PVIN capacitor

and output capacitors must all be placed as close to the

LTC3559/LTC3559-1 as possible and on the same side as

the LTC3559/LTC3559-1. All connections must be made on

that same layer. Place a local unbroken ground plane below

these components that is tied to the Exposed Pad (Pin 17)

of the LTC3559/LTC3559-1. The Exposed Pad must also

be soldered to system ground for proper operation.

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