参数资料
| 型号： | LTC4081EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 21/24页 |
| 文件大小： | 0K |
| 描述： | IC USB POWER MANAGER 10-DFN |
| 标准包装： | 2,500 |
| 功能： | 电源管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 3.75 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
LTC4081
APPLICATIO S I FOR ATIO
Accepting larger values of Δ I L allows the use of low
Table 1. Recommended Surface Mount Inductor Manufacturers
inductances, but results in higher output voltage ripple,
greater core losses, and lower output current capability. A
reasonable starting point for setting ripple current is Δ I L
=0.3 ? I LIM , where I LIM is the peak switch current limit.
The largest ripple current occurs at the maximum input
Coilcraft
Sumida
Murata
Toko
www.coilcraft.com
www.sumida.com
www.murata.com
www.tokoam.com
V OUT ?
?
L ≥
? ? 1 ?
?
voltage.Toguaranteethattheripplecurrentstaysbelowa
speci?ed maximum, the inductor value should be chosen
according to the following equation:
V OUT
? ?
f 0 ? Δ I L ? V IN ( MAX ) ?
For applications with V OUT = 1.8V, the above equation
suggests that an inductor of at least 6.8μH should be used
for proper operation.
Many different sizes and shapes of inductors are
available from numerous manufacturers. To maximize
ef?ciency, choose an inductor with a low DC resistance.
Keep in mind that most inductors that are very thin or
have a very small volume typically have much higher core
and DCR losses and will not give the best ef?ciency. Also
choose an inductor with a DC current rating at least 1.5
times larger than the peak inductor current limit to ensure
that the inductor does not saturate during normal opera-
tion. To minimize radiated noise use a toroid or shielded
pot core inductor in ferrite or permalloy materials. Table
Input and Output Capacitor Selection
Since the input current waveform to a buck converter is a
square wave, it contains very high frequency components.
It is strongly recommended that a low equivalent series
resistance (ESR) multilayer ceramic capacitor be used to
bypass the BAT pin which is the input for the converter.
Tantalum and aluminum capacitors are not recommended
because of their high ESR. The value of the capacitor on
BAT directly controls the amount of input voltage ripple for
a given load current. Increasing the size of this capacitor
will reduce the input ripple.
To prevent large V OUT voltage steps during transient
load conditions, it is also recommended that a ceramic
capacitor be used to bypass V OUT . A typical value for this
capacitor is 4.7μF.
Multilayer Ceramic Chip Capacitors (MLCC) typically have
exceptional ESR performance. MLCCs combined with a
carefully laid out board with an unbroken ground plane will
yield very good performance and low EMI emissions.
1 shows a list of several inductor manufacturers.
4081f
21
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相关代理商/技术参数 |
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| LTC4085 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Battery Charger/USB Power Manager |
| LTC4085-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:USB Power Manager with Ideal Diode Controller and 4.1V Li-Ion Charger |
| LTC4085-3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:USB Power Manager with Ideal Diode Controller and 3.95V Li-Ion Charger |
| LTC4085EDE | 制造商:Linear Technology 功能描述:USB Power Manager 14-Pin DFN EP |
| LTC4085EDE#PBF | 功能描述:IC USB POWER MANAGER 14-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
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