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参数资料
| 型号： | LTC3601IUD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.5A 16QFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 14.52 V |
| 输入电压： | 4 V ~ 15 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 800kHz ~ 4MHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QFN-EP（3x3） |
LTC3601
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
C IN and C OUT Selection
The input capacitance, C IN , is needed to ?lter the trapezoi-
dal 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:
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
I RMS = I OUT(MAX)
V OUT ( V IN – V OUT )
V IN
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.
where I OUT(MAX) equals the maximum average output
current. This formula has a maximum at V IN = 2V OUT ,
where I RMS = I OUT /2. This simple worst-case condition
is commonly used for design because even signi?cant
deviations do not offer much relief. Note that ripple cur-
Table 1. Inductor Selection Table
INDUCTANCE DCR MAX
(μH) (mΩ) CURRENT
(A)
Würth Electronik WE-PD2 Typ MS Series
DIMENSIONS
(mm)
HEIGHT
(mm)
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.
0.56
0.82
1.2
1.7
9.5
14
21
27
6.5
5.4
4.8
4
5.2 × 5.8
2
Several capacitors may be paralleled to meet the require-
ments of the design. For low input voltage applications
suf?cient bulk input capacitance is needed to minimize
2.2 36 3.6
Vishay IHLP-2020BZ-01 Series
0.47 8.8 11.5
0.68 12.4 10
5.2 × 5.5
2
transient effects during output load changes. Even though
the LTC3601 design includes an overvoltage protection
circuit, care must always be taken to ensure input voltage
1
2.2
20
50.1
7
4.2
transients do not pose an overvoltage hazard to the part.
V OUT < I L ESR +
Toko DE3518C Series
0.56 24 3.3
1.2 30 2.4
1.7 35 2.1
Sumida CDRH2D18/HP Series
0.56 33 3.7
0.82 39 2.9
1.1 43 2.5
Cooper SD18 Series
3.5 × 3.7
3.2 × 3.2
1.8
2
The selection of C OUT is primarily determined by the effec-
tive series resistance (ESR) that is required to minimize
voltage ripple and load step transients. The output ripple,
? V OUT , is determined by:
1
8 ? f ? C OUT
0.47
0.82
1.2
1.5
2.2
20.1
24.7
29.4
34.5
39.8
3.58
3.24
2.97
2.73
2.55
5.5 × 5.5
1.8
The output ripple is highest at maximum input voltage
since ? I L increases with input voltage. Multiple capacitors
placed in parallel may be needed to meet the ESR and
Coilcraft LPS4018 Series
0.56 30
1 40
2.2 70
TDK VLS25201 2 Series
0.47 56
1 88
1.5 126
2.2
155
4.8
2.8
2.7
3.3
2.4
2
1.8
4 × 4
2.5 × 2
1.7
1.2
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
highest capacitance density, but it is important to only
3601fb
11
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