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| 型号： | LTC3125EDCB#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1900 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 2 X 2 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, DFN-8 |
| 文件页数： | 3/18页 |
| 文件大小： | 303K |
| 代理商： | LTC3125EDCB#PBF |
LTC3125
11
3125fa
APPLICATIONS INFORMATION
power losses compared to cheaper powdered iron types,
improving efciency. The inductor should have low DCR
(DC resistance of the windings) to reduce the I2R power
losses, and must be able to support the peak inductor
current without saturating. Molded chokes and some chip
inductors usually do not have enough core area to support
the peak inductor currents of 1.8A seen on the LTC3125.
To minimize radiated noise, use a shielded inductor. See
Table 1 for suggested components and suppliers.
Table 1. Recommended Inductors
VENDOR
PART/STYLE
Coilcraft
(847) 639-6400
www.coilcraft.com
LPO2506
LPS4012, LPS4018
MSS6122
MSS4020
MOS6020
DS1605, DO1608
Coiltronics
www.cooperet.com
SD52, SD53, SD3114, SD3118
Murata
(714) 852-2001
www.murata.com
LQH55D
Sumida
(847) 956-0666
www.sumida
CDH40D11
Taiyo-Yuden
www.t-yuden.com
NP04SB
NR3015
NR4018
TDK
(847) 803-6100
www.component.tdk.com
VLP, LTF
VLF, VLCF
Wurth
(201) 785-8800
www.we-online.com
WE-TPC Type S, M, MH, MS
Output and Input Capacitor Selection
When selecting output capacitors for large pulsed loads,
the magnitude and duration of the pulsing current, together
with the ripple voltage specication, determine the choice
of the output capacitor. Both the ESR of the capacitor and
the charge stored in the capacitor each cycle contribute
to the output voltage ripple. The ripple due to the charge
is approximately:
VRIPPLE (mV)=
IPULSE –ISTANDBY
()t
ON
COUT
where IPULSE and tON are the peak current and on time
during transmission burst and ISTANDBY is the current in
standby mode. The above is a worst-case approximation
assuming all the pulsing energy comes from the output
capacitor.
The ripple due to the capacitor ESR is:
VRIPPLE_ESR = (IPULSE – ISTANDBY) ESR
Low ESR and high capacitance are critical to maintain low
output voltage ripple. Typically, two low prole 2200μF
parallel Vishay TANTAMOUNT
tantalum, low ESR capaci-
tors are used. The capacitor has less than 40m
Ω ESR.
These capacitors can be used in parallel for even larger
capacitance values. For applications requiring very high
capacitance, the GS, GS2 and GW series from Cap-XX,
the BestCapTM series from AVX and PowerStor Aerogel
Capacitors from Cooper all offer very high capacitance and
low ESR in various package options. Table 2 shows a list
of several reservoir capacitor manufacturers.
Multilayer ceramic capacitors are an excellent choice for
input decoupling of the step-up converter as they have
extremely low ESR and are available in small footprints.
Input capacitors should be located as close as possible
to the device. While a 10μF input capacitor is sufcient
for most applications, larger values may be used to re-
duce input current ripple without limitations. Consult the
manufacturers directly for detailed information on their
selection of ceramic capacitors. Although ceramic capaci-
tors are recommended, low ESR tantalum capacitors may
be used as well.
Table 2. Capacitor Vendor Information
SUPPLIER
PHONE
WEBSITE
Vishay
(402) 563-6866
www.vishay.com
AVX
(803) 448-9411
www.avxcorp.com
Cooper Bussman
(516) 998-4100
www.cooperbussman.com
Cap-XX
(843) 267-0720
www.cap-xx-com
Panasonic
(800) 394-2112
www.panasonic.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3125EDCBTRMPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Up 1.8-5.5V DFN8EP |
| LTC3125EDCB-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.2A Synchronous Step-Up DC/DC Converter with Input Current Limit |
| LTC3127 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:40V, 2A Synchronous Buck-Boost DC/DC Converter |
| LTC3127EDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A Buck-Boost DC/DC Converter with Programmable Input Current Limit |
| LTC3127EDD#PBF | 功能描述:IC BUCK BOOST SYNC ADJ 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 应用:热电冷却器 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.173"，4.40mm 宽）裸露焊盘 供应商设备封装:28-TSSOP 裸露焊盘 包装:管件 产品目录页面:1410 (CN2011-ZH PDF) |
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