LTC3535

13

3535f

Table 1. Recommended Inductors

VENDOR

PART/STYLE

Coilcraft

(847) 639-6400

www.coilcraft.com

LPO4815

LPS4012, LPS4018

MSS5131

MSS4020

MOS6020

ME3220

DS1605, DO1608

Coiltronics

www.cooperet.com

SD10, SD12, SD14, SD18, SD20,

SD52, SD3114, SD3118

FDK

(408) 432-8331

www.fdk.com

MIP3226D4R7M, MIP3226D3R3M

MIPF2520D4R7

MIPWT3226D3R0

Murata

(714) 852-2001

www.murata.com

LQH43C

LQH32C (-53 series)

301015

Sumida

(847) 956-0666

www.sumida.com

CDRH5D18

CDRH2D14

CDRH3D16

CDRH3D11

CR43

CMD4D06-4R7MC

CMD4D06-3R3MC

Taiyo-Yuden

www.t-yuden.com

NP03SB

NR3015T

NR3012T

TDK

(847) 803-6100

www.component.tdk.com

VLP

VLF, VLCF

Toko

(408) 432-8282

www.tokoam.com

D412C

D518LC

D52LC

D62LCB

Wurth

(201) 785-8800

www.we-online.com

WE-TPC type S, M

Output and Input Capacitor Selection

Low ESR (equivalent series resistance) capacitors should

be used to minimize the output voltage ripple. Multilayer

ceramic capacitors are an excellent choice as they have

extremely low ESR and are available in small footprints. A

APPLICATIONS INFORMATION

4.7μF to 10μF output capacitor is sufficient for most ap-

plications. Larger values may be used to obtain extremely

low output voltage ripple and improve transient response.

X5R and X7R dielectric materials are preferred for their

ability to maintain capacitance over wide voltage and

temperature ranges. Y5V types should not be used.

The internal loop compensation of the LTC3535 is designed

to be stable with output capacitor values of 4.7μF or greater

(without the need for any external series resistor). Although

ceramic capacitors are recommended, low ESR tantalum

capacitors may be used as well.

A small ceramic capacitor in parallel with a larger tantalum

capacitor may be used in demanding applications that have

large load transients. Another method of improving the

transient response is to add a small feed-forward capacitor

to FB). A typical value of 22pF will generally suffice.

Low ESR input capacitors reduce input switching noise

and reduce the peak current drawn from the battery. It

follows that ceramic capacitors are also a good choice

for input decoupling and should be located as close as

possible to the device. A 2.2μF input capacitor is sufficient

for most applications, although larger values may be

used without limitations. Table 2 shows a list of several

ceramic capacitor manufacturers. Consult the manufactur-

ers directly for detailed information on their selection of

ceramic capacitors.

Table 2. Capacitor Vendor Information

SUPPLIER

PHONE

WEBSITE

AVX

(803) 448-9411

www.avxcorp.com

Murata

(714) 852-2001

www.murata.com

Taiyo-Yuden

(408) 573-4150

www.t-yuden.com

TDK

(847) 803-6100

www.component.tdk.com

Samsung

(408) 544-5200

www.sem.samsung.com