LTC3427_15 Datasheet, PDF (8/12 Pages) Linear Technology – 500mA, 1.25MHz Synchronous Step-Up DC/DC Converter in 2mm 2mm DFN Package

LTC3427
APPLICATIO S I FOR ATIO
Table 1. Inductor Vendor Information
SUPPLIER
PHONE
Murata
USA: [phone]
[phone]
Sumida
USA: [phone]
Japan: 81-3-3607-5111
Coilcraft
[phone]
CoEv Magnetics [phone]
FAX
USA: [phone]
USA: [phone]
Japan: 81-3-3607-5144
[phone]
[phone]
WEBSITE
www.murata.com
www.sumida.com
www.coilcraft.com
www.circuitprotection.com/magnetics.asp
TDK
TOKO
Wurth
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
www.component.tdk.com
www.toko.com
www.we-online.com
0.280
0.260
0.240
1.8V TO 3V
3.1V TO 5V
1.8V TO 3.3V
0.220
0.200
1.8V TO 3.6V
0.180
0.160
0.140
1.8V TO 5V
0.120
0.100
3 5 7 9 11 13 15 17 19 21 23
INDUCTANCE (µH)
3427 F02
Figure 2. Maximum Output Current vs
Inductance Based on 90% Efficiency
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 2.2µF 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
AVX
[phone] [phone]
Sanyo [phone] [phone]
WEBSITE
www.avxcorp.com
www.sanyovideo.com
TDK
Murata
Taiyo
Yuden
[phone]
USA:
[phone]
[phone]
[phone]
(847) 803-629
USA:
[phone]
[phone]
www.component.
tdk.com
www.murata.com
www.t-yuden.com
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.
3427fa
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