参数资料
| 型号： | LTC3561EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1A 8DFN |
| 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： | 0.8 V ~ 5 V |
| 输入电压： | 2.63 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 最高 4MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN-EP（3x3） |
LTC3561
APPLICATIO S I FOR ATIO
Table 1. Representative Surface Mount Inductors
MANU- MAX DC
FACTURER PART NUMBER VALUE CURRENT DCR HEIGHT
Toko A914BYW-2R2M-D52LC 2.2 μ H 2.05A 49m ? 2mm
Coilcraft D01608C-222 2.2 μ H 2.3A 70m ? 3mm
Coilcraft LP01704-222M 2.2 μ H 2.4A 120m ? 1mm
Sumida CDRH2D18/HP-2R2 2.2 μ H 1.6A 48m ? 2mm
Output Capacitor (C OUT ) Selection
The selection of C OUT is driven by the required ESR to
minimize voltage ripple and load step transients. Typically,
once the ESR requirement is satisfied, the capacitance is
adequate for filtering. The output ripple ( ? V OUT ) is deter-
mined by:
? V OUT ≈ ? I L ? ESR +
Taiyo Yuden N05DB2R2M
Murata LQN6C2R2M04
Cooper SD3112-2R2
2.2 μ H
2.2 μ H
2.2 μ H
2.9A
3.2A
1.1A
32m ? 2.8mm
24m ? 5mm
140m ? 1.2mm
?
?
1 ?
?
8 f O C OUT ?
TDK VLF3010AT-2R2M1R0 2.2 μ H
EPCO B82470A1222M 2.2 μ H
Input Capacitor (C IN ) Selection
1.0A
1.6A
100m ? 1.0mm
90m ? 1.2mm
where f = operating frequency, C OUT = output capacitance
and ? I L = ripple current in the inductor. The output ripple
is highest at maximum input voltage since ? I L increases
with input voltage. With ? I L = 0.3 ? I LIM the output ripple
≈ I
In continuous mode, the input current of the converter is
a square wave with a duty cycle of approximately V OUT /
V IN . To prevent large voltage transients, a low equivalent
series resistance (ESR) input capacitor sized for the maxi-
mum RMS current must be used. The maximum RMS
capacitor current is given by:
V OUT ( V IN ? V OUT )
I RMS MAX
V IN
where the maximum average output current I MAX equals
the peak current minus half the peak-to-peak ripple cur-
rent, I MAX = I LIM – ? I L /2.
This formula has a maximum at V IN = 2V OUT , where
I RMS = I OUT /2. This simple worst case is commonly used
to design because even significant deviations do not offer
much relief. Note that capacitor manufacturer’s ripple
current ratings are often based on only 2000 hours life-
time. This makes it advisable to further derate the capaci-
tor, or choose a capacitor rated at a higher temperature
than required. Several capacitors may also be paralleled to
meet the size or height requirements of the design. An
additional 0.1 μ F to 1 μ F ceramic capacitor is also recom-
mended on V IN for high frequency decoupling, when not
using an all ceramic capacitor solution.
will be less than 100mV at maximum V IN and f O = 1MHz
with:
ESRC OUT < 150m ?
Once the ESR requirements for C OUT have been met, the
RMS current rating generally far exceeds the I RIPPLE(P-P)
requirement, except for an all ceramic solution.
In surface mount applications, multiple capacitors may
have to be paralleled to meet the capacitance, ESR or RMS
current handling requirement of the application. Alumi-
num electrolytic, special polymer, ceramic and dry tanta-
lum capacitors are all available in surface mount pack-
ages. The OS-CON semiconductor dielectric capacitor
available from Sanyo has the lowest ESR(size) product of
any aluminum electrolytic at a somewhat higher price.
Special polymer capacitors, such as Sanyo POSCAP, offer
very low ESR, but have a lower capacitance density than
other types. Tantalum capacitors have the highest capaci-
tance density, but it has a larger ESR and it is critical that
the capacitors are surge tested for use in switching power
supplies. An excellent choice is the AVX TPS series of
surface mount tantalums, available in case heights rang-
ing from 2mm to 4mm. Aluminum electrolytic capacitors
have a significantly larger ESR, and is often used in
extremely cost-sensitive applications provided that con-
sideration is given to ripple current ratings and long term
reliability. Ceramic capacitors have the lowest ESR and
cost but also have the lowest capacitance density, a high
voltage and temperature coefficient and exhibit audible
3561f
7
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