參數(shù)資料
型號(hào)： LTC3456EUF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： ECONOLINE: RSZ/P - 1kVDC
中文描述： 0.9 A BATTERY CHARGE CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 4 X 4 MM, PLASTIC, MO-220-WGGD, QFN-24
文件頁(yè)數(shù)： 20/28頁(yè)
文件大?。?/td> 358K
代理商： LTC3456EUF
20
LTC3456
3456f
APPLICATIU
COMPONENT SELECTION
W
U
U
Inductor Selection
The high frequency operation of LTC3456 allows the use
of small surface mount inductors. For most applications,
the inductance value will be between 2.2
μ
H and 10
μ
H. The
desired value of inductance is determined by the amount
of ripple current,
I
L
, in the converter.
The inductor current ripple,
I
L
, for Boost mode operation
neglecting the voltage drop across the switches is given
by:
=
(
OUT
)
I
V
V
V
V
f L
L
IN
OUT
IN
–
The inductor current ripple,
I
L
, for Buck mode operation
neglecting the voltage drop across the switches is given
by:
=
(
)
I
V
V
V
V
f L
L
OUT
IN
OUT
IN
1
–
where
L = Inductor
f = Operating Frequency
V
IN
= Input Voltage
V
OUT
= Output Voltage
The
I
L
is typically set to 20% to 40% of the maximum
inductor current.
The inductor should have a saturation current rating
greater than the peak inductor current required for the
application. Also, ensure that the inductor has a low DCR
(copper wire resistance) to minimize I
2
R power losses.
Several inductors that work well with the LT3456 are listed
in Table 1. Consult each manufacturer for more detailed
information and for their entire selection of related parts.
Output Capacitor Selection
Low ESR (equivalent series resistance) capacitors should
be used at the output to minimize the output ripple voltage.
Multilayer ceramic capacitors are an excellent choice, as
they have an extremely low ESR and are available in very
small packages. Use only X7R or X5R dielectrics, as these
materials retain their capacitance over wider voltage and
temperature ranges than other dielectrics. A 1
μ
F to 22
μ
F
output capacitor is sufficient for most applications. Solid
tantalum or OS-CON capacitors can be used, but they will
occupy more board area than a ceramic and will have a
higher ESR for the same device footprint. Always use a
capacitor with a sufficient voltage rating.
Table 2 shows a list of several ceramic capacitor manufac-
turers. Consult the manufacturers for detailed information
on their entire selection of ceramic parts.
Table 1. Recommended Inductors
MAX
DCR
(
)
0.2
0.36
CURRENT
RATING
(mA)
950
680
L
PART
ELT5KT-4R7
ELT5KT-100
(
μ
H)
4.7
10
VENDOR
Panasonic
(714) 373-7939
www.panasonic.com
Sumida
(847) 956-0666
www.sumida.com
Murata
(814) 237-1431
www.murata.com
Toko
(800) 745-8656
www.toko.com
CDRH4D18-4R7
CDRH4D18-100
4.7
10
0.16
0.2
840
610
LQH32CN4R7
LQH32CN100
4.7
10
0.15
0.3
650
450
1002AS-4R7M
1002AS-100M
4.7
10
0.19
0.32
910
620
Table 2. Ceramic Capacitor Manufacturers
Taiyo Yuden
(408) 573-4150
www.t-yuden.com
(803) 448-9411
www.avxcorp.com
(714) 852-2001
www.murata.com
(847) 803-6100
www.component.tdk.com
AVX
Murata
TDK
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