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参数资料
| 型号： | MIC94044YFL TR |
| 厂商： | Micrel Inc |
| 文件页数： | 6/9页 |
| 文件大小： | 0K |
| 描述： | IC LOAD SW HI-SIDE 3A 4MLF |
| 标准包装： | 1 |
| 类型： | 高端 |
| 输入类型： | 非反相 |
| 输出数： | 1 |
| 导通状态电阻： | 55 毫欧 |
| 电流 - 输出 / 通道： | 3A |
| 电源电压： | 1.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 4-WDFN，4-MLF? |
| 供应商设备封装： | 4-MLF?（1.2x1.2） |
| 包装： | 标准包装 |
| 其它名称： | 576-3972-6 |
Micrel, Inc.
Application Information
Power Switch SOA
The safe operating area (SOA) curve represents the
boundary of maximum safe operating current and
maximum safe operating ambient temperature.
Maximum Switch Current
vs. Ambient Temperature
MIC94044/5
3.5
3.0
(1" Square Copper)
V IN = 5V
Figure 3: Simple Thermal Circuit
2.5
2.0
1.5
1.0
0.5
V IN = 3.6V
V IN = 2.5V
V IN = 4.5V
Now replacing the variables in the equation for V X , we
can find the junction temperature (T J ) from power
dissipation, ambient temperature and the known thermal
resistance of the PCB (R θ CA ) and the package (R θ JC ).
T J = P DISS x (R θ JC + R θ CA ) + T A
0.0
-40 -20
0 20 40 60 80 100 120 140
AMBIENT TEMPERATURE (°C)
P DISS is calculated as I SWITCH2 x R SWmax . R θ JC is found in
the operating ratings section of the datasheet and R θ CA
(the PCB thermal resistance) values for various PCB
Figure 1: SOA Graph
The curves above show the SOA for various values of
V IN, mounted on a typical 1 layer, 1 square inch copper
board.
Power Dissipation Considerations
As with all power switches, the current rating of the
switch is limited mostly by the thermal properties of the
package and the PCB it is mounted on. There is a
simple ohms law type relationship between thermal
resistance, power dissipation and temperature, which
are analogous to an electrical circuit:
Figure 2: Simple Electrical Circuit
From this simple circuit we can calculate V X if we know
I SOURCE , V Z and the resistor values, R XY and R YZ using
the equation:
V X = I SOURCE ( R XY + R YZ ) + V Z
Thermal circuits can be considered using these same
rules and can be drawn similarly by replacing current
sources with power dissipation (in Watts), resistance
with thermal resistance (in o C/W) and voltage sources
with temperature (in o C).
copper areas is discussed in the document “ Designing
with Low Dropout Voltage Regulators ” available from the
Micrel website (LDO Application Hints).
March 2011
6
M9999-032311-A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC94045YFL | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:28mΩ RDSON 3A High Side Load Switch in 1.2mm x 1.2mm MLF? Package |
| MIC94045YFL TR | 功能描述:电源开关 IC - USB High-Side Load Switch 3A, 28mohm 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 |
| MIC94045YFLTR | 制造商:Micrel Inc 功能描述:Power Switch Hi Side 1.7 5.5V 3A 4MLF |
| MIC94045YFL-TR | 功能描述:IC LOAD SW HI-SIDE 3A 4MLF 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 开关类型:通用 输出数:1 比率 - 输入:输出:1:1 输出配置:高端 输出类型:P 通道 接口:开/关 电压 - 负载:1.7 V ~ 5.5 V 电压 - 电源（Vcc/Vdd）:不需要 电流 - 输出（最大值）:3A 导通电阻（典型值）:28 毫欧 输入类型:非反相 特性:负载释放，压摆率受控型 故障保护:- 工作温度:-40°C ~ 125°C （TJ） 封装/外壳:4-WDFN，4-MLF? 供应商器件封装:4-MLF?（1.2x1.2） 标准包装:1 |
| MIC9404X | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:28mΩ RDSON 3A High Side Load Switch in 1.2mm x 1.2mm MLF? package |
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