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參數(shù)資料
| 型號： | LTC3455EUF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger |
| 中文描述： | 4 A BATTERY CHARGE CONTROLLER, 1800 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WGGD-X, QFN-24 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 516K |
| 代理商： | LTC3455EUF |
LTC3455
16
3455f
Switching Regulator Inductor Selection
Many different sizes and shapes of inductors are available
from numerous manufacturers. Choosing the right induc-
tor from such a large selection of devices can be over-
whelming, but following a few basic guidelines will make
the selection process much simpler. To maximize effi-
ciency, choose an inductor with a low DC resistance. Keep
in mind that most inductors that are very thin or have a very
small volume typically have much higher core and DCR
losses, and will not give the best efficiency.
Choose an inductor with a DC current rating at least 1.5
times larger than the maximum load current to ensure that
the inductor does not saturate during normal operation.
Table 1 shows several inductors that work well with the
LTC3455. These inductors offer a good compromise in
current rating, DCR and physical size. Consult each manu-
facturer for detailed information on their entire selection of
inductors.
APPLICATIU
W
U
U
Table 1. Recommended Inductors
Max
I
DC
(A)
0.86
0.58
Max
DCR
(
)
0.1
0.18
Inductor
Type
DB318C
L
Height
(mm)
1.8
1.8
(
μ
H)
4.7
10
Manufacturer
Toko
(847)297-0070
www.toko.com
Sumida
(847)956-0666
www.sumida.com
Sumida
CLS4D09
4.7
10
0.75
0.5
0.19
0.37
1
1
CDRH3D16
4.7
10
4.7
10
0.9
0.55
1.29
0.82
0.11
0.21
0.12
0.28
1.8
1.8
1.2
1.2
SD12
Cooper
(561)752-5000
www.cooperet.com
Panasonic
(408)945-5660
www.panasonic.com
ELT5KT
4.7
10
1
0.2
0.36
1.2
1.2
0.68
Switching Regulator Output Capacitor Selection
Low ESR (equivalent series resistance) ceramic capaci-
tors should be used at both switching regulator outputs.
Only X5R or X7R ceramic capacitors should be used
because they retain their capacitance over wider voltage
and temperature ranges than other ceramic types. A 10
μ
F
output capacitor is sufficient for most applications. Table
2 shows a list of several ceramic capacitor manufacturers.
Consult each manufacturer for detailed information on
their entire selection of ceramic capacitors. Many manu-
facturers now offer very thin (<1mm tall) ceramic capaci-
tors ideal for use in height-restricted designs.
V
BAT
Pin Capacitor Selection
For the V
BAT
pin, a 4.7
μ
F to 10
μ
F ceramic capacitor is the
best choice. Only X5R or X7R ceramic capacitors should
be used.
V
MAX
Pin Capacitor Selection
For the V
MAX
pin, a 10
μ
F ceramic capacitor is the best
choice. Only X5R or X7R ceramic capacitors should be
used. Do not use less than 10
μ
F on this pin. For some
designs it may be desirable to use a larger capacitor
connected to V
MAX
to act as a reservoir when the LTC3455
is USB powered. Up to 50
μ
F of ceramic capacitance may
be connected to the V
MAX
pin without difficulty. More than
50
μ
F requires using a capacitor with some ESR (like a
Tantalum or OS-CON) or adding some resistance in series
with some of the ceramic capacitance. This is necessary
to ensure loop stability in the battery charger loop when
under USB power.
Table 2. Recommended Ceramic Capacitor Manufacturers
Taiyo Yuden
(408) 573-4150
AVX
(803) 448-9411
Murata
(714) 852-2001
TDK
(888) 835-6646
www.t-yuden.com
www.avxcorp.com
www.murata.com
www.tdk.com
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