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LT3590

3590f

Inductor Selection

A 220μH inductor is recommended for most LT3590 ap-

plications with VIN < 25V and 470μH is recommended for

applications with VIN > 25V. Although small size and high

efﬁciency are major concerns, the inductor should have

low core losses at 850kHz and low DCR (copper wire

resistance). Several manufacturers and inductor series

that meet these criteria are listed in Table 1. The efﬁciency

comparison of different inductors is shown in Figure 3.

Table 1. Inductor Manufacturers

VENDOR

PART

SERIES

INDUCTANCE

RANGE (μH)

(RELEVANT TO

THIS PART)

DIMENSIONS

(mm)

Coilcraft

www.coilcraft.com

DO1605

LPS4012

LPS3010

1812FS

MSS5131

100 TO 680

100 TO 330

100 TO 680

100 TO 390

5.4 × 4.2 × 1.8

4.0 × 4.0 × 1.2

3.0 × 3.0 × 0.9

5.1 × 5.1 × 3.1

Sumida

www.sumida.com

CDC4D20

100 TO 680

4.8 × 4.8 × 2.0

Toko

www.tokoam.com

LLQ1608

LLQ2012

100 TO 270

100 TO 680

Würth Elektronik

www.we-online.com

WE-PD2

TYPE M

WE-PD2

TYPE L

100 TO 220

100 to 470

5.2 × 5.8 × 4.5

7.0 × 7.8 × 5.0

Coiltronics

www.cooperet.com

CTX32C

100 to 330

2.5 × 3.2 × 2.2

Murata

www.murata.com

LQH32M

LQH43M

100 to 560

100 to 680

3.2 × 2.5 × 2.0

4.5 × 3.2 × 2.0

APPLICATIONS INFORMATION

Figure 3. Efﬁciency Comparison of Different Inductors

Capacitor Selection

The small size of ceramic capacitors make them ideal

for LT3590 applications. X5R and X7R types are recom-

mended because they retain their capacitance over wider

voltage and temperature ranges than other types such as

Y5V or Z5U. A 1μF input capacitor and a 0.1μF regulator

capacitor are sufﬁcient for most applications. For the

output capacitor, 1μF is generally recommended, but if

the voltage across the capacitor exceeds 10V, a 0.47μF

capacitor may be used instead. For applications driving

one or two LEDs a 2.2μF output capacitor is needed.

Table 2 shows a list of several ceramic capacitor manufac-

turers. Consult the manufacturers for detailed information

on their entire selection of ceramic parts.

Table 2: Recommended Ceramic Capacitor Manufacturers

Taiyo Yuden

(408) 573-4150

www.t-yuden.com

AVX

(803) 448-9411

www.avxcorp.com

Murata

(714) 852-2001

www.murata.com

Kemet

(408) 986-0424

www.kemet.com

LED CURRENT (mA)

3590 F03

TDK SLF70145-471MR22-PF

MURATA QH32CN471K23

MURATA LQH43CN471K03

COILCRAFT LP06013-474KLB

COILCRAFT 1008PS-474KLB

COILCRAFT LPS4012-474ML

VIN = 48V

10 LEDs

FRONT PAGE

APPLICATION

CIRCUIT

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