参数资料
| 型号： | LTC3428EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 4A 10DFN |
| 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： | 1.6 V ~ 5.25 V |
| 输入电压： | 1.6 V ~ 4.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 无 |
| 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） |
LTC3428
APPLICATIONS INFORMATION
5.0
Sumida CDRH4D22C/LD or CDRH5D28 series, Toko
4.5
4.0
3.5
1 PHASE
CONVERTER
FDV0630 or D62CB series.
Table 1. Inductor Vendor Information
3.0
2 PHASE
SUPPLIER PHONE
FAX
WEBSITE
2.5
CONVERTER
Coilcraft
(847) 639-6400 (847) 639-1469 www.coilcraft.com
2.0
Murata
USA:
USA:
www.murata.com
1.5
(814) 238-1431 (814) 238-0490
1.0
0.5
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
Sumida
USA:
(847) 956-6666
Japan:
81-3-3607-5111
USA:
(847) 956-0702
Japan:
81-3-3607-5144
www.sumida.com
TIME (μs)
3428 F02
TDK
Toko
(847) 803-6100 (847) 803-6296 www.component.tdk.com
(847) 299-0070 (847) 699-7864 www.toko.com
Figure 2. Output Ripple Current Comparison
Wurth
(201)785-8800
(201)785-8810
www.we-online.com
Between Single Phase and Two Phase Boost
Converters with a 2A Load and 50% Duty Cycle
COMPONENT SELECTION
Inductor Selection
Output Capacitor Selection
The minimum value of the capacitor is set to reduce the
output ripple voltage due to charging and discharging the
capacitor each cycle. The steady state ripple due to this
charging is given by:
The high frequency operation of the LTC3428 allows for the
use of small surface mount inductors. The inductor ripple
current is typically set to between 20% and 40% of the
V RIPPLE ( C ) =
1 I PEAK ? ( V OUT – V IN(MIN) )
?
2 C OUT ? V OUT ? f
maximum inductor current. For a given set of conditions,
the inductance is given as follows:
where: I PEAK = Peak inductor current (A)
The equivalent series resistance (ESR) of the output
L ≥
V IN(MIN) ? (V OUT – V IN(MIN) )
R ? V OUT
, L > 2 μ H
capacitor will contribute another term to output voltage
ripple. Ripple voltage due to capacitor ESR is:
where:
R = Allowable inductor current ripple (Amps P-P)
V IN(MIN) = Minimum input voltage (V)
V OUT = Output voltage (V)
For high ef?ciency, the inductor should have a high
frequency core material, such as ferrite, to reduce core
losses. The inductor should have a low ESR (equivalent
series resistance) to reduce I 2 R losses and must be able
to handle the peak inductor current without saturating.
Use of a toroid, pot core, or shielded bobbin inductor will
minimize radiated noise. See Table 1 for a list of inductor
manufacturers. Some example inductor part types are:
Coilcraft 1608 and 3316 series, Murata LQH55D series,
V RIPPLE ( ESR ) = I PEAK ? R ESR ( C )
where:
R ESR(C) = Capacitor ESR
The ESL (Equivalent Series Inductance) is another
capacitor characteristic that needs to be minimized. ESL
will be minimized by using small surface mount ceramic
capacitors, placed as close to the V OUT pin as possible.
Input Capacitor Selection
Since the V IN pin directly powers most of the internal
circuitry, it is recommended to place at least a 4.7μF, low
ESR bypass capacitor between V IN and AGND, as close
to the IC as possible. See Table 2 for a list of capacitor
manufacturers.
3428fb
7
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