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| 型号： | LTC3443EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/16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： | 600kHz |
| 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） |
LTC3443
APPLICATIO S I FOR ATIO
COMPONENT SELECTION
For high efficiency, choose an inductor with a high fre-
quency core material, such as ferrite, to reduce core loses.
1 SHDN/SS
2 GND
3 PGND
4 SW1
5 SW2
6 PGND
FB 12
V C 11
V IN 10
PV IN 9
V OUT 8
MODE 7
V IN
V 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. 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 toroid, pot core
or shielded bobbin inductor. See Table 1 for suggested
components and Table 2 for a list of component suppliers.
Table 1. Inductor Vendor Information
3443 F06
SUPPLIER
PHONE
FAX
WEB SITE
GND
MULTIPLE VIAS
Coilcraft
Coiltronics
(847) 639-6400
(561) 241-7876
(847) 639-1469
(561) 241-9339
www.coilcraft.com
www.coiltronics.com
Figure 6. Recommended Component Placement. Traces Carrying
Murata
USA:
USA:
www.murata.com
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 LTC3443 allows the
Sumida
(814) 237-1431 (814) 238-0490
(800) 831-9172
USA: www.japanlink.com/
(847) 956-0666 (847) 956-0702 sumida
Japan:
81(3) 3607-5111 81(3) 3607-5144
V IN ( MIN ) ? ( V OUT IN ( MIN ) ) ? 100
V OUT ( IN ( MAX ) – V OUT ) ? 100
I OUT ( MAX ) ? ( V OUT – V IN ( MIN ) ) ? 100
% Ripple _ Boost = %
C OUT OUT ? f
? V
I OUT ( MAX ) ? ( V IN ( MAX ) – V OUT ) ? 100
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 ) ? % R ipple ? V OUT
? V
L > H
f ? I O UT ( 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
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:
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
3443fa
11
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| LTC3444EDD#PBF | 功能描述:IC DC/DC CONV WCDMA 8-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3444EDD#TRPBF | 功能描述:IC DC/DC CONV WCDMA 8-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3445 | 制造商:LINER 制造商全称:Linear Technology 功能描述:I2C Controllable Buck Regulator with Two LDOs in a 4mm × 4mm QFN |
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