8

LTC3427

3427fa

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 pos-

sible to the device. A 2.2

µF input capacitor is sufficient for

virtually any application. Larger values may be used with-

out limitations. Table 2 shows a list of several ceramic

capacitor manufacturers. Consult the manufacturers di-

rectly for detailed information on their entire selection of

ceramic capacitors.

Table 2. Capacitor Vendor Information

SUPPLIER PHONE

FAX

WEBSITE

AVX

(803) 448-9411

(803) 448-1943

www.avxcorp.com

Sanyo

(619) 661-6322

(619) 661-1055

www.sanyovideo.com

TDK

(847) 803-6100

(847) 803-629

www.component.

tdk.com

Murata

USA:

USA:

www.murata.com

(814) 237-1431

(814) 238-0490

(800) 831-9172

Taiyo

(408) 573-4150

(408) 573-4159

www.t-yuden.com

Yuden

Thermal Considerations

To deliver the power that the LTC3427 is capable of, it is

imperative that a good thermal path be provided to dissi-

pate the heat generated within the package. This can be

accomplished by taking advantage of the large thermal

pad on the underside of the LTC3427. It is recommended

that multiple vias in the printed circuit board be used to

conduct heat away from the LTC3427 and into the copper

plane with as much area as possible. In the event that the

junction temperature gets too high, the LTC3427 will go

into thermal shutdown and all switching will stop until the

internal temperature drops at which point a soft-start cycle

will be initiated.

INDUCTANCE (

µH)

3

15 17 19 21

0.280

0.260

0.240

0.220

0.200

0.180

0.160

0.140

0.120

0.100

3427 F02

579

11 13

23

1.8V TO 3V

1.8V TO 3.3V

3.1V TO 5V

1.8V TO 3.6V

1.8V TO 5V

Figure 2. Maximum Output Current vs

Inductance Based on 90% Efficiency

Table 1. Inductor Vendor Information

SUPPLIER

PHONE

FAX

WEBSITE

Murata

USA: (814) 237-1431

USA: (814) 238-0490

www.murata.com

(800) 831-9172

Sumida

USA: (847) 956-0666

USA: (847) 956-0702

www.sumida.com

Japan: 81-3-3607-5111

Japan: 81-3-3607-5144

Coilcraft

(847) 639-6400

(847) 639-1469

www.coilcraft.com

CoEv Magnetics

(800) 227-7040

(650) 361-2508

www.circuitprotection.com/magnetics.asp

TDK

(847) 803-6100

(847) 803-6296

www.component.tdk.com

TOKO

(847) 297-0070

(847) 669-7864

www.toko.com

Wurth

(201) 785-8800

(201) 785-8810

www.we-online.com

APPLICATIO S I FOR ATIO