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| 型号： | LTC3441EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 12DFN |
| 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： | 2.4 V ~ 5.25 V |
| 输入电压： | 2.4 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 1.2A |
| 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： | 12-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 12-DFN（4x3） |
LTC3441
APPLICATIO S I FOR ATIO
COMPONENT SELECTION
handle the peak inductor current without saturating. Molded
chokes or chip inductors usually do not have enough core
1 SHDN/SS
FB 12
to support the peak inductor currents in the 1A to 2A
2 GND
3 PGND
V C 11
V IN 10
V IN
region. To minimize radiated noise, use a toroid, pot core
or shielded bobbin inductor. See Table 1 for suggested
components and Table 2 for a list of component suppliers.
4 SW1
5 SW2
PV IN 9
V OUT 8
V OUT
Table 1. Inductor Vendor Information
SUPPLIER PHONE FAX
WEB SITE
6 PGND
MODE 7
Coilcraft
Coiltronics
Murata
(847) 639-6400
(561) 241-7876
USA:
(847) 639-1469
(561) 241-9339
USA:
www.coilcraft.com
www.coiltronics.com
www.murata.com
3441 F06
(814) 237-1431
(800) 831-9172
(814) 238-0490
GND
MULTIPLE VIAS
Sumida
USA: www.japanlink.com/
(847) 956-0666 (847) 956-0702 sumida
V IN ( MIN ) ? ( V OUT IN ( MIN ) ) ? 100
V OUT ? ( V IN ( MAX ) – V OUT ) ? 100
I OUT ( MAX ) ? ( V OUT IN ( MIN ) ) ? 100
% Ripple _ Boost = %
C OUT OUT ? f
? V
I OUT ( MAX ) ? ( V IN ( MAX ) – V OUT ) ? 100
Figure 6. Recommended Component Placement. Traces Carrying
High Current are Direct. Trace Area at FB and V C Pins are Kept
Low. Lead Length to Battery Should be Kept Short. V OUT and V IN
Ceramic Capacitors Close to the IC Pins
Inductor Selection
The high frequency operation of the LTC3441 allows the
use of small surface mount inductors. The inductor cur-
rent ripple is typically set to 20% to 40% of the maximum
inductor current. For a given ripple the inductance terms
are given as follows:
– V
L > H ,
f ? I OUT ( MAX ) ? % Ripple ? V OUT
L > H
f ? I OUT ( MAX ) ? % Ripple ? V IN ( MAX )
where f = operating frequency, Hz
%Ripple = allowable inductor current ripple, %
V IN(MIN) = minimum input voltage, V
V IN(MAX) = maximum input voltage, V
V OUT = output voltage, V
I OUT(MAX) = maximum output load current
For high efficiency, choose an inductor with a high fre-
quency core material, such as ferrite, 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
Japan:
81(3) 3607-5111 81(3) 3607-5144
Output Capacitor Selection
The bulk value of the 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:
– V
2
% Ripple _ Buck = %
C OUT ? V IN ( MAX ) ? V OUT ? f
where C OUT = output filter capacitor, F
The output capacitance is usually many times larger in
order to handle the transient response of the converter.
For a rule of thumb, the ratio of the operating frequency to
the unity-gain bandwidth of the converter is the amount
the output capacitance will have to increase from the
above calculations in order to maintain the desired tran-
sient response.
The other component of ripple is due to the ESR (equiva-
lent series resistance) of the output capacitor. Low ESR
capacitors should be used to minimize output voltage
ripple. For surface mount applications, Taiyo Yuden ce-
ramic capacitors, AVX TPS series tantalum capacitors or
Sanyo POSCAP are recommended.
3441fa
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3442 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation |
| LTC3442EDE | 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 2.4V to 5.5V 12-Pin DFN EP |
| LTC3442EDE#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 12DFN 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 |
| LTC3442EDE#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 2.4V to 5.5V 12-Pin DFN EP T/R |
| LTC3442EDE#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 12DFN 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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