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参数资料
| 型号： | LTC3425EUH#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 5A 32QFN |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.4 V ~ 5.25 V |
| 输入电压： | 0.5 V ~ 4.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 100kHz ~ 2MHz |
| 电流 - 输出： | 5A |
| 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： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
LTC3425
APPLICATIO S I FOR ATIO
L1
C SS
C IN
R T
L4
The inductor current ripple is typically set to 20% to 40%
of the maximum inductor current.
For high efficiency, choose an inductor with high fre-
quency core material, such as ferrite to reduce core loses.
C OUT
C OUT
LTC3425
C OUT
C OUT
The inductor should have low ESR (equivalent series
resistance) to reduce the I 2 R losses, and must be able to
handle the peak inductor current without saturating. To
minimize radiated noise, use a shielded inductor. (Note
that the inductance of shielded types will drop more as
L2
L3
current increases, and will saturate more easily). See
Table 2 for a list of inductor manufacturers.
Table 2. Inductor Vendor Information
Figure 5. Typical Board Layout
3425 F05
SUPPLIER
Coilcraft
Murata
PHONE
(847) 639-6400
USA:
FAX
(847) 639-1469
USA:
WEB SITE
www.coilcraft.com
www.murata.com
(814) 237-1431
(814) 238-0490
LTC3425
Sumida
USA:
(847) 956-0666
Japan:
81-3-3607-5111
USA:
(847) 956-0702
Japan:
81-3-3607-5144
www.japanlink.com/
sumida
3425 F06
TDK
(847) 803-6100
(847) 803-6296
www.component.
Figure 6. Example Board Layout for a 10W, 4-Phase Boost
Converter. Total Area = 0.50in 2 (with All Components Mounted
on the Topside of Board)
COMPONENT SELECTION
Inductor Selection
The high frequency, multiphase operation of the LTC3425
allows the use of small surface mount inductors. The
minimum inductance value is proportional to the operat-
ing frequency and is limited by the following constraints:
tdk.com
Some example inductor part types are:
Coilcraft DO-1608, DS-1608 and DT-1608 series
Murata LQH3C, LQH4C, LQH32C and LQN6C series
Sumida CDRH3D16, CDRH4D18, CDRH4D28, CR32,
CR43 series
TDK RLF5018T and NLFC453232T series
Output Capacitor Selection
L >
2
f
and L >
V IN ( MIN ) ? ( V OUT ( MAX ) – V IN ( MIN )
f ? Ripple ? V OUT ( MAX )
)
The output voltage ripple has three components to it. The
bulk value of the capacitor is set to reduce the ripple due
to charge into the capacitor each cycle. The max ripple due
where:
to charge is given by:
f = Operating frequency in MHz (of each phase)
Ripple = Allowable inductor current ripple (amps
V RBULK =
I P ? V IN
C OUT ? V OUT ? f ? 4
peak-peak)
V IN(MIN) = Minimum input voltage
V OUT(MAX) = Maximum output voltage
where:
I P = peak inductor current
f = switching frequency of one phase
3425f
17
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