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參數(shù)資料
| 型號： | LTC3547BEDDB |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.7 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 X 2 MM, 0.75 MM HEIGHT, PLASTIC, M0-229WECD-1, DFN-8 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大小： | 270K |
| 代理商： | LTC3547BEDDB |
LTC3547B
8
3547bfa
APPLICATIO S I FOR ATIO
WU
U
A general LTC3547B application circuit is shown in
Figure 1. External component selection is driven by the
load requirement, and begins with the selection of the
inductor L. Once the inductor is chosen, CIN and COUT
can be selected.
Inductor Selection
Although the inductor does not inuence the operat-
ing frequency, the inductor value has a direct effect on
ripple current. The inductor ripple current ΔIL decreases
with higher inductance and increases with higher VIN
or VOUT:
I
V
fL
V
L
OUT
O
OUT
IN
=
( )
11
Accepting larger values of ΔIL allows the use of low
inductances, but results in higher output voltage ripple,
greater core losses, and lower output current capability.
A reasonable starting point for setting ripple current
is 40% of the maximum output load current. So, for a
300mA regulator, ΔIL = 120mA (40% of 300mA).
Inductor Core Selection
Different core materials and shapes will change the
size/current and price/current relationship of an induc-
tor. Toroid or shielded pot cores in ferrite or permalloy
materials are small and do not radiate much energy, but
generally cost more than powdered iron core inductors
with similar electrical characteristics. The choice of which
style inductor to use often depends more on the price vs
size requirements, and any radiated eld/EMI requirements,
than on what the LTC3547B requires to operate. Table 1
shows some typical surface mount inductors that work
well in LTC3547B applications.
Figure 1. LTC3547B General Schematic
CF2
CF1
VIN
2.5V TO 5.5V
VOUT2
VOUT1
3547b F01
R3
R1
R4
L2
L1
R2
COUT2
C1
COUT1
VIN
RUN2
RUN1
LTC3547B
VFB2
SW2
SW1
VFB1
GND
Table 1. Representative Surface Mount Inductors
MANU-
FACTURER
PART NUMBER
VALUE
MAX DC
CURRENT
DCR
HEIGHT
Taiyo Yuden
CB2016T2R2M
CB2012T2R2M
CB2016T3R3M
2.2H
3.3H
510mA
530mA
410mA
0.13Ω
0.33Ω
0.27Ω
1.6mm
1.25mm
1.6mm
Panasonic
ELT5KT4R7M
4.7H
950mA
0.2Ω
1.2mm
Sumida
CDRH2D18/LD
4.7H
630mA
0.086Ω
2mm
Murata
LQH32CN4R7M23
4.7H
450mA
0.2Ω
2mm
Taiyo Yuden
NR30102R2M
NR30104R7M
2.2H
4.7H
1100mA
750mA
0.1Ω
0.19Ω
1mm
FDK
FDKMIPF2520D
4.7H
3.3H
2.2H
1100mA
1200mA
1300mA
0.11Ω
0.1Ω
0.08Ω
1mm
TDK
VLF3010AT4R7-
MR70
VLF3010AT3R3-
MR87
VLF3010AT2R2-
M1RD
4.7H
3.3H
2.2H
700mA
870mA
1000mA
0.24Ω
0.17Ω
0.12Ω
1mm
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