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參數(shù)資料
| 型號： | LTC3456 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 2-Cell, Multi-Output DC/DC Converter with USB Power Manager |
| 中文描述： | 2節(jié)電池，多輸出DC / DC轉換器與USB電源管理器 |
| 文件頁數(shù)： | 20/28頁 |
| 文件大?。?/td> | 358K |
| 代理商： | LTC3456 |
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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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| LTC3456EUF#TRPBF | 功能描述:IC CONV DC/DC USB BATT 24-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
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