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| 型号： | LTC3407EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1A DL 10DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.5MHz |
| 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： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LTC3407
APPLICATIONS INFORMATION
load currents. This causes a dip in ef?ciency in the upper
Table 1. Representative Surface Mount Inductors
range of low current operation. In Burst Mode operation,
lower inductance values will cause the burst frequency
to increase.
Inductor Core Selection
Different core materials and shapes will change the size/
current and price/current relationship of an inductor. 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
PART
NUMBER
Sumida
CDRH3D16
Sumida
CMD4D06
Panasonic
ELT5KT
VALUE
(μH)
1.5
2.2
3.3
4.7
2.2
3.3
4.7
3.3
4.7
DCR
(Ω MAX)
0.043
0.075
0.110
0.162
0.116
0.174
0.216
0.17
0.20
MAX DC
CURRENT (A)
1.55
1.20
1.10
0.90
0.950
0.770
0.750
1.00
0.95
SIZE
W × L × H (mm 3 )
3.8 × 3.8 × 1.8
3.5 × 4.3 × 0.8
4.5 × 5.4 × 1.2
electrical characteristics. The choice of which style in-
ductor to use often depends more on the price vs size
requirements and any radiated ?eld/EMI requirements
than on what the LTC3407 requires to operate. Table 1
Murata 1.0 0.060 1.00
LQH32CN 2.2 0.097 0.79
4.7 0.150 0.65
Output Capacitor (C OUT ) Selection
2.5 × 3.2 × 2.0
shows some typical surface mount inductors that work
well in LTC3407 applications.
Input Capacitor (C IN ) Selection
In continuous mode, the input current of the converter is a
square wave with a duty cycle of approximately V OUT /V IN .
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 satis?ed, the capacitance
is adequate for ?ltering. The output ripple ( Δ V OUT ) is
determined by:
To prevent large voltage transients, a low equivalent series
resistance (ESR) input capacitor sized for the maximum
RMS current must be used. The maximum RMS capacitor
V OUT
I L ESR +
1
8f O C OUT
current is given by:
V OUT (V IN – V OUT )
I RMS ≈ I 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 – Δ 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 signi?cant deviations do not offer
much relief. Note that capacitor manufacturer’s ripple cur-
rent ratings are often based on only 2000 hours lifetime.
This makes it advisable to further derate the capacitor,
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
0.1μF to 1μF ceramic capacitor is also recommended on
V IN for high frequency decoupling, when not using an all
ceramic capacitor solution.
where f = operating frequency, C OUT = output capacitance
and Δ I L = ripple current in the inductor. The output ripple
is highest at maximum input voltage since Δ I L increases
with input voltage. With Δ I L = 0.3 ? I LIM the output ripple
will be less than 100mV at maximum V IN and f O = 1.5MHz
with:
ESR COUT < 150mΩ
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. Aluminum
electrolytic, special polymer, ceramic and dry tantulum
capacitors are all available in surface mount packages. 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
3407fa
8
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