CAT32

7

Doc. No. MD-5001 Rev. AD

Characteristics subject to change without notice

APPLICATION INFORMATION

INDUCTOR SELECTION AND EFFICIENCY

Inductor vendors are shown below. Contact the manufacturer for detailed technical data and new product

information.

Table 1: Inductor Manufacturers

Inductor

L (μH)

Maximum

DCR (mΩ)

Maximum

Height (mm)

Vendor

Web

ELJEA4R7

4.7

180

2.2

ELJEA6R8

6.8

250

2.2

Panasonic

714.373.7334

www.panasonic.com

LQH3C4R7M24,

LQH32CN4R7M11

4.7

260

2.2

LQH3C100K24,

LQH32CN100K11

10

300

2.2

Murata

770.436.1300

www.murata.com

LB2016B4R7

4.7

250

2.0

LB2016B100

3.8

350

2.0

Taiyo Yuden

408.573.4150

www.t-yuden.com

CMD4D06-4R7

4.7

216

0.8

CMD4D06-6R8

6.8

296

0.8

CLQ4D10-4R7

4.7

162

1.2

CLQ4D10-6R8

6.8

195

1.2

Sumida

847.956.0666

www.sumida.com

CAPACITOR SELECTION

Low ESR (equivalent series resistance) capacitors

should be used at the output to minimize the output

ripple voltage. The low ESR and small package options

available with multilayer ceramic capacitors make them

excellent choices. The X5R and X7R capacitor types

are preferred because they retain their capacitance

over wider voltage and temperature ranges than the

Y5V or Z5U types. A 1.0µF or 2.2µF output capacitor is

recommended for most applications.

The voltage rating of the output capacitor C2 depends

on the number of LEDs driven in series. A 10V

ceramic capacitor is recommended when driving two

LEDs. A 16V ceramic capacitor is recommended

when driving 3 or 4 LEDs.

Table 2: Ceramic Capacitor Manufacturers

Supplier

Phone

Web

Taiyo Yuden 408.573.4150

www.t-yuden.com

Murata

814.237.1431

www.murata.com

Kemet

408.986.0424

www.kemet.com

Low profile ceramic capacitors with a 1mm maximum

height/thickness are available for designs height

requirements. Ceramic capacitors also make a good

choice for the input capacitor, which should be

mounted as close as possible to the CAT32. A 2.2µF

or 4.7µF input capacitor is recommended. Table 2

shows

a

list

of

several

ceramic

capacitor

manufacturers. Consult the manufacturers for detailed

information as new products and package options are

introduced regularly.