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LTC3427 Datasheet(PDF) 8 Page - Linear Technology

Part No. LTC3427
Description  500mA, 1.25MHz Synchronous Step-Up DC/DC Converter in 2mm 2mm DFN Package
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC3427 Datasheet(HTML) 8 Page - Linear Technology

 
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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


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