CAT32

7

Doc No. 5001, Rev. AC

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

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 1.0

µF 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.

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 2.2

µF 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.

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

Inductor

L (

µH)

Maximum

Maximum

Vendor

Web

DCR (m

Ω)

Height (mm)

ELJEA4R7

4.7

180

2.2

Panasonic

ELJEA6R8

6.8

250

2.2

714.373.7334

www.panasonic.com

LQH3C4R7M24,

4.7

260

2.2

LQH32CN4R7M11

Murata

LQH3C100K24,

10

300

2.2

770.436.1300

www.murata.com

LQH32CN100K11

LB2016B4R7

4.7

250

2.0

Taiyo Yuden

LB2016B100

3.8

350

2.0

408.573.4150

www.t-yuden.com

CMD4D06-4R7

4.7

216

0.8

CMD4D06-6R8

6.8

296

0.8

Sumida

CLQ4D10-4R7

4.7

162

1.2

847.956.0666

www.sumida.com

CLQ4D10-6R8

6.8

195

1.2