LTC3400BES6 データシートの表示（PDF） - Linear Technology
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LTC3400BES6 Datasheet PDF : 12 Pages
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LTC3400/LTC3400B
APPLICATIO S I FOR ATIO
Table 1. Recommended Inductors
PART
MAX
L DCR HEIGHT
(µH) mΩ (mm)
CDRH5D18-4R1
4.1
57
2.0
CDRH5D18-100
10 124
2.0
CDRH3D16-4R7
4.7 105
1.8
CDRH3D16-6R8
170
1.8
CR43-4R7
4.7 109
3.5
CR43-100
10 182
3.5
CMD4D06-4R7MC 4.7 216
0.8
CMD4D06-3R3MC 3.3 174
0.8
DS1608-472
DS1608-103
DO1608C-472
4.7 60
2.9
10 75
2.9
4.7 90
2.9
D52LC-4R7M
D52LC-100M
4.7 84
2.0
10 137
2.0
LQH3C4R7M24
4.7 195
2.2
VENDOR
Sumida
(847) 956-0666
www.sumida.com
Coilcraft
(847) 639-6400
www.coilcraft.com
Toko
(408) 432-8282
www.tokoam.com
Murata
www.murata.com
Output and Input Capacitor Selection
Low ESR (equivalent series resistance) capacitors should
be used to minimize the output voltage ripple. Multilayer
ceramic capacitors are an excellent choice as they have
extremely low ESR and are available in small footprints. A
2.2µF to 10µF output capacitor is sufficient for most
applications. Larger values up to 22µF may be used to
obtain extremely low output voltage ripple and improve
transient response. An additional phase lead capacitor
may be required with output capacitors larger than 10µF
to maintain acceptable phase margin. X5R and X7R
dielectric materials are preferred for their ability to main-
tain capacitance over wide voltage and temperature ranges.
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 4.7µF 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 parts.
Table 2. Capacitor Vendor Information
SUPPLIER
PHONE
AVX
(803) 448-9411
Murata
(714) 852-2001
Taiyo Yuden
(408) 573-4150
WEBSITE
www.avxcorp.com
www.murata.com
www.t-yuden.com
Output Diode
Use a Schottky diode such as an MBR0520L, CMDSH2-3,
1N5817 or equivalent if the converter output voltage is 4.5V
or greater. The Schottky diode carries the output current for
the time it takes for the synchronous rectifier to turn on. Do
not use ordinary rectifier diodes, since the slow recovery
times will compromise efficiency. A Schottky diode is
optional for output voltages below 4.5V, but will increase
converter efficiency by 2% to 3%.
3400f
7
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