ISL91110

10

FN8434.4

February 5, 2016

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Inductor Selection

An inductor with high frequency core material (e.g., ferrite core)

should be used to minimize core losses and provide good

efficiency. The inductor must be able to handle the peak

switching currents without saturating.

A 1µH inductor with ≥4A saturation current rating is

recommended. Select an inductor with low DCR to provide good

efficiency. In applications where radiated noise must be

minimized, a toroidal or shielded inductor can be used.

The input and output capacitors should be ceramic X5R type with

low ESL and ESR. The recommended input capacitor value is

Recommended PCB Layout

Correct PCB layout is critical for proper operation of the

ISL91110. The input and output capacitors should be positioned

as closely to the IC as possible. The ground connections of the

input and output capacitors should be kept as short as possible,

and should be on the component layer to avoid problems that are

caused by high switching currents flowing through PCB vias.

TABLE 2. INDUCTOR VENDOR INFORMATION

MANUFACTURER

MFR. PART NUMBER

DESCRIPTION

DIMENSION (mm)

WEBSITE

Toko

1277AS-H-1R0M

1µH, 20%, DCR = 34mΩ

typIsat = 4.6A (typ) 3.2x2.5x1.2

www.toko.com

FDSD0312-H-1R0M

1µH, 20%, DCR = 43mΩ

typIsat = 4.5A (typ) 3.2x3.0x1.2

Coilcraft

XFL4020-102ME

1µH, 20%, DCR = 11mΩ

typIsat = 5.1A (typ) 4.0x4.0x2.1

www.coilcraft.com

TABLE 3. CAPACITOR VENDOR INFORMATION

MANUFACTURER

SERIES

WEBSITE

AVX

X5R

www.avx.com

Murata

X5R

www.murata.com

Taiyo Yuden

X5R

www.t-yuden.com

TDK

X5R

www.tdk.com