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参数资料
| 型号： | LTC3530EMS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC 0.6A 10MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.8 V ~ 5.25 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 300kHz ~ 2MHz |
| 电流 - 输出： | 600mA |
| 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-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP |
LTC3530
OPERATION
V IN
where f = operating frequency, Hz
SHDN /SS
V CI
V C
Δ I L = maximum allowable inductor ripple current, A
V IN(MIN) = minimum input voltage, V
V IN(MAX) = maximum input voltage, V
V OUT = output voltage, V
3530 F05
Soft-Start
Figure 3.
I OUT(MAX) = maximum output load current
For high ef?ciency, choose a ferrite inductor with a high
frequency core material to reduce core loses. The induc-
The soft-start function is combined with shutdown.
When the SHDN /SS pin is brought above 1V typical, the
IC is enabled but the EA duty cycle is clamped from V C .
A detailed diagram of this function is shown in Figure 3.
The components R SS and C SS provide a slow ramping
voltage on SHDN /SS to provide a soft-start function. To
ensure that V C is not being clamped, SHDN /SS must be
tor 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. Molded chokes or chip
inductors usually do not have enough core to support the
peak inductor currents in the 1A to 2A region. To minimize
radiated noise, use a shielded inductor. See Table 1 for a
suggested list of inductor suppliers.
raised above 1.6V.
Output Capacitor Selection
COMPONENT SELECTION
Inductor Selection
The high frequency operation of the LTC3530 allows the
The bulk value of the output ?lter capacitor is set to reduce
the ripple due to charge into the capacitor each cycle. The
steady state ripple due to charge is given by:
% Ripple_Boost =
use of small surface mount inductors. The inductor ripple
current is typically set to 20% to 40% of the maximum
inductor current. For a given ripple the inductance terms
are given as follows:
I OUT(MAX) ? (V OUT – V IN(MIN) ) ? 100
C OUT ? V OUT 2 ? f
%
L BOOST >
L BUCK >
V OUT ? (V IN(MAX) – V OUT )
1 (V IN(MAX) – V OUT ) ? 100
8LCf 2
V IN(MIN) ? (V OUT – V IN(MIN) )
f ? I L ? V OUT
H
f ? I L ? V IN(MAX)
Table 1. Inductor Vendor Information
H
% Ripple_Buck =
%
V IN(MAX)
where C OUT = output ?lter capacitor in Farads and
f = switching frequency in Hz.
SUPPLIER
Coilcraft
CoEv Magnetics
Murata
PHONE
(847) 639-6400
(800) 227-7040
(814) 237-1431
FAX
(847) 639-1469
(650) 361-2508
(814) 238-0409
WEB SITE
www.coilcraft.com
www.circuitprotection.com/magnetics.asp
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
3530fb
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| LTC3531EDD#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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