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参数资料
| 型号： | MIC2045-2BTS TR |
| 厂商： | Micrel Inc |
| 文件页数： | 14/15页 |
| 文件大小： | 0K |
| 描述： | IC DISTRIBUTION SW SGL 16-TSSOP |
| 标准包装： | 2,500 |
| 类型： | 高端开关 |
| 输出数： | 1 |
| Rds（开）： | 30 毫欧 |
| 内部开关： | 是 |
| 电流限制： | 可调 |
| 输入电压： | 0.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC2045-2BTSTR MIC2045-2BTSTR-ND |
MIC2044/2045
Power Dissipation
Figure 4. Lower UVLO Setting
Micrel
P D = R DS(on) × (I OUT ) 2
T J = P D × R ( θ J-A) + T A
Power dissipation depends on several factors such as the
load, PCB layout, ambient temperature, and package type.
The following equations can be used to calculate power
dissipation and die temperature.
Calculation of power dissipation can be accomplished by the
following equation:
(5)
To relate this to junction temperature, the following equation
can be used:
(6)
where T J = junction temperature, T A = ambient temperature
and R θ (J-A) is the thermal resistance of the package.
Printed Circuit Board Hot Plug
The MIC2044/45 are ideal inrush current limiting power
switches suitable for hot plug applications. Due to the inte-
grated charge pump, the MIC2044/45 present a high imped-
ance when in the off state and the device slowly becomes a
low impedance as it turns on. This effectively isolates power
supplies from highly capacitive loads by reducing inrush
current during hot plug events. This same feature also can be
used for soft-start requirements.
PCB Layout Recommendations
The MIC2044 and MIC2045 have very low on-resistance,
typically 20m ? , and the switches can provide up to 6A of
continuous output current. Under heavy loads, the switched
current may cause the devices to heat up considerably. The
following list contains some useful suggestions for PCB
layout design of the MIC2044/45 in order to prevent the die
1. Supply additional copper area under the device
to remove heat away from the IC.
See “Application Hint 17” for a general guideline
in calculating the suggested area.
2. Provide additional pad area on the corner pins of
the MIC2044/45 IC for heat distribution.
3. Tie the common power pins (V IN = pins 7, 11,
13, 16 and V OUT = pins 9, 12, 14) together in a
manner such that the traces entering and
leaving the device have a uniform width suffi-
cient for the application’s current requirements
plus added margin (25% minimum recom-
mended).
Ex: For 4A maximum current, design traces for
5A capability.
4. For PCB trace width calculation, there are
numerous calculator programs available on the
internet and elsewhere. As a general rule of
thumb, 15-20 mils width for every 1A of current
when using 1oz. copper. However, the trace
width calculators often take into account maxi-
mum temperature increase constraints, as well
as layer arrangement, in determining the PCB
trace widths. As a reference, the following link is
suggested for trial tests in PCB trace width
calculations. 1
http://www.aracnet.com/cgi-usr/gpatrick/trace.pl
from overheating under normal operating conditions.
MIC2044/2045
14
1.
Micrel Semiconductor does not assume responsibility for the use of
this program tool in the event that any PCB assembled, tested,
produced, and/or manufactured becomes damaged and/or causes any
degradation of system performance or damage to any system
components in which the aforementioned PCB is included.
January 2005
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2045-2YTS | 功能描述:电源开关 IC - USB 22 mohm Low Voltage Switch - Lead Free RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MIC2045-2YTS TR | 功能描述:电源开关 IC - USB 23 mohm Low Voltage Switch - Lead Free RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MIC207.5VP | 制造商:Littelfuse 功能描述:FUSE - MICRO2 BLADE 32V AG 7.5A 制造商:Littelfuse 功能描述:RETAIL / Fuse - Micro2 Blade 32V Ag 7.5A 5pc Card |
| MIC2070 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:USB Power Controller Advance Information |
| MIC2070-1BQS | 功能描述:IC USB PWR CTRLR DUAL 16-QSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 控制器 系列:- 标准包装:2,450 系列:- 控制器类型:SPI 总线至 I²C 总线桥接 接口:I²C，串行，SPI 电源电压:2.4 V ~ 3.6 V 电流 - 电源:11mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-HVQFN（4x4） 包装:托盘 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名称:935286452157SC18IS600IBSSC18IS600IBS-ND |
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