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参数资料
| 型号： | LTC3442EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/20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： | 300kHz ~ 2MHz |
| 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） |
LTC3442
APPLICATIONS INFORMATION
C OUT ? V OUT ? f
Forhighefficiency,chooseaferriteinductorwithahigh
frequency core material to reduce core loses. The induc-
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.
Output Capacitor Selection
The bulk value of the output filter 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=
I OUT(MAX) ? ( V OUT – V IN(MIN) ) ? 100 %
2
% RIPPLE_BUCK =
I OUT(MAX) ? ( V IN(MAX) – V OUT ) ? 100 %
C OUT ? V IN(MAX) ? V OUT ? f
where C OUT = output filter capacitor in Farads and
f = switching frequency in Hz.
Table 1. Inductor Vendor Information
The output capacitance is usually many times larger than
the minimum value in order to handle the transient response
requirements 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 transient 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 or
TDK ceramic capacitors, AVX TPS series tantalum capaci-
tors or Sanyo POSCAP are recommended. See Table 2 for
contact information.
Input Capacitor Selection
Since V IN is the supply voltage for the IC, as well as the input
to the power stage of the converter, it is recommended to
place at least a 4.7μF, low ESR ceramic bypass capacitor
close to the V IN and SGND pins. It is also important to
minimize any stray resistance from the converter to the
battery or other power source.
SUPPLIER
Coilcraft
CoEv Magnetics
Murata
Sumida
TDK
TOKO
PHONE
(847) 639-6400
(800) 227-7040
(814) 237-1431
(800) 831-9172
USA: (847) 956-0666
Japan: 81(3) 3607-5111
(847) 803-6100
(847) 297-0070
FAX
(847) 639-1469
(650) 361-2508
(814) 238-0490
USA: (847) 956-0702
Japan: 81(3) 3607-5144
(847) 803-6296
(847) 699-7864
WEB SITE
www.coilcraft.com
www.circuitprotection.com/magnetics.asp
www.murata.com
www.sumida.com
www.component.tdk.com
www.tokoam.com
Table 2. Capacitor Vendor Information
SUPPLIER
AVX
Murata
Sanyo
Taiyo Yuden
TDK
PHONE
(803) 448-9411
(814) 237-1431
(800) 831-9172
(619) 661-6322
(408) 573-4150
(847) 803-6100
FAX
(803) 448-1943
(814) 238-0490
(619) 661-1055
(408) 573-4159
(847) 803-6296
WEB SITE
www.avxcorp.com
www.murata.com
www.sanyovideo.com
www.t-yuden.com
www.component.tdk.com
3442fb
For more information www.linear.com/LTC3442
13
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| LTC3443 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Current Micropower 600kHz Synchronous Buck-Boost DC/DC Converter |
| LTC3443EDE | 功能描述:IC REG BUCK BOOST SYNC ADJ 12DFN RoHS:否 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 |
| LTC3443EDE#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 |
| LTC3443EDE#TR | 功能描述:IC REG BUCK BOOST SYNC ADJ 12DFN RoHS:否 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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