参数资料
| 型号： | LTC3444EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC CONV WCDMA 8-DFN |
| 标准包装： | 2,500 |
| 应用： | 转换器，WCDMA 功率放大器应用 |
| 输入电压： | 2.75 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 5 V |
| 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 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 包装： | 带卷 (TR) |
LTC3444
OPERATIO
L BUCK >
Inductor Selection
The high frequency operation of the LTC3444 allows the
use of small surface mount inductors. The internal loop
compensation is designed to work with a 2.2 μ H inductor
(1.5 μ H for V IN < 3.1V). The 2.2 μ H inductor was selected to
optimize the transient response to the control input. The
use of a 2.2 μ H inductor pushes out the right half plane
(RHP) zero frequency and allows the loop crossover to
occur at frequencies higher than the output L-C double
V OUT ? ( V IN ( MAX ) – V OUT )
f ? I OUT ( MAX ) ? Δ I L ? V IN ( MAX )
where f = operating frequency, Hz
Δ I L = inductor ripple current, A
V IN(MIN) = minimum input voltage, V
V IN(MAX) = maximum input voltage, V
H
pole.
For external compensation the inductor selection is based
on the desired inductor ripple current. The inductor ripple
current is typically set to 20% to 40% of the average
inductor current. Increased inductance results in lower
ripple current, however, higher inductance pulls in the
RHP zero frequency and limits the maximum crossover
frequency possible. Refer to Closing the Feedback Loop
for more information on the RHP zero. For a given ripple
the inductance terms are given as follows:
V OUT = output voltage, V
I OUT(MAX) = maximum output load current
In most cases, the boost configuration will be used to
determine the minimum inductance allowed for a given
ripple current.
For high efficiency, choose a ferrite inductor with a high
frequency core material to reduce core loses. The inductor
should have low ESR (equivalent series resistance) to
reduce the I 2 R losses, and must be able to handle the peak
L BOOST >
V IN ( MIN ) ? ( V OUT – V IN ( MIN ) )
f ? I OUT ( MAX ) ? Δ I L ? V OUT
H
inductor current without saturating. To minimize radiated
noise, use a shielded inductor. See Table 2 for a suggested
list of inductor suppliers.
Table 2. Inductor Vendor Information
SUPPLIER
Coilcraft
CoEv Magnetics
COOPER Bussmann
Murata
PHONE
(847) 639-6400
(800) 227-7040
(636) 394-2877
(814) 237-1431
FAX
(847) 639-1469
(650) 361-2508
1-800-544-2570
(814) 238-0490
WEB SITE
www.coilcraft.com
www.circuitprotection.com/magnetics.asp
www.coooperET.com
www.murata.com
(800) 831-9172
Sumida
TDK
TOKO
USA: (847) 956-0666
Japan: 81(3) 3607-5111
(847) 803-6100
(847) 297-0070
USA: (847) 956-0702
Japan: 81(3) 3607-5144
(847) 803-6296
(847) 699-7864
www.sumida.com
www.component.tdk.com
www.tokoam.com
3444fb
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