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参数资料
| 型号： | LTC3604IUD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PQCC16 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16 |
| 文件页数： | 3/24页 |
| 文件大小： | 277K |
| 代理商： | LTC3604IUD#TRPBF |
LTC3604
11
3604f
APPLICATIONS INFORMATION
exceeded. This collapse will result in an abrupt increase
in inductor ripple current, so it is important to ensure the
core will not saturate.
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 don’t radiate much energy but
generally cost more than powdered iron core inductors
with similar characteristics. The choice of which style
inductor to use mainly depends on the price versus size
requirements and any radiated eld/EMI requirements.
New designs for surface mount inductors are available
from Toko, Vishay, NEC/Tokin, Cooper, Coilcraft, TDK and
Würth Electronik. Table 1 gives a sampling of available
surface mount inductors.
Table 1. Inductor Selection Table
INDUCTANCE
(μH)
DCR
(mΩ)
MAX
CURRENT (A)
DIMENSIONS
(mm)
HEIGHT
(mm)
Würth Electronik WE-PD2 Typ MS Series
0.27
0.56
0.82
1.2
1.7
2.2
5.3
9.5
14
21
27
36
8.2
6.5
5.4
4.8
4
3.6
5.2
× 5.8
2
Vishay IHLP-2020BZ-01 Series
0.22
0.33
0.47
0.68
1
2.2
5.2
8.2
8.8
12.4
20
50.1
15
12
11.5
10
7
4.2
5.2
× 5.5
2
Toko DE3518C Series
0.56
24
3.3
3.5
× 3.7
1.8
Sumida CDRH2D18/HP Series
0.36
0.56
0.82
29
33
39
4.6
3.7
2.9
3.2
× 3.2
2
Cooper SD18 Series
0.47
0.82
1.2
1.5
20.1
24.7
29.4
34.5
3.58
3.24
2.97
2.73
5.5
× 5.5
1.8
Coilcraft LPS4018 Series
0.56
1
2.2
30
40
70
4.8
2.8
2.7
4
× 4
1.7
TDK VLS252012 Series
0.47
56
3.3
2.5
× 2
1.2
CIN and COUT Selection
The input capacitance, CIN,isneededtolterthetrapezoidal
wave current at the drain of the top power MOSFET. To
prevent large voltage transients from occurring a low ESR
input capacitor sized for the maximum RMS current is
recommended. The maximum RMS current is given by:
II
VV
V
RMS
OUT MAX
OUT
IN
OUT
IN
=
()
–
where IOUT(MAX) equals the maximum average output
current. This formula has a maximum at VIN = 2VOUT,
where IRMS = IOUT/2. This simple worst-case condition
is commonly used for design because even signicant
deviations do not offer much relief. Note that ripple cur-
rent ratings from capacitor manufacturers are often based
on only 2000 hours of life which makes it advisable to
further de-rate the capacitor or choose a capacitor rated
at a higher temperature than required.
Several capacitors may be paralleled to meet the require-
ments of the design. For low input voltage applications
sufcient bulk input capacitance is needed to minimize
transient effects during output load changes. Even though
the LTC3604 design includes an overvoltage protection
circuit, care must always be taken to ensure input voltage
transients do not pose an overvoltage hazard to the part.
The selection of COUT is primarily determined by the effec-
tive series resistance (ESR) that is required to minimize
voltage ripple and load step transients. The output ripple,
ΔVOUT, is determined by:
ΔΔ
VI
ESR
fC
OUT
L
OUT
<+
1
8
The output ripple is highest at maximum input voltage
since
ΔIL increases with input voltage. Multiple capacitors
placed in parallel may be needed to meet the ESR and
RMS current handling requirements. Dry tantalum, special
polymer, aluminum electrolytic, and ceramic capacitors are
all available in surface mount packages. Special polymer
capacitors offer low ESR but have lower capacitance
density than other types. Tantalum capacitors have the
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