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| 型号： | MIC94085YFT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC LOAD SWITCH HI SIDE 2A 4-TMLF |
| 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： | 67 毫欧 |
| 电流 - 输出 / 通道： | 2A |
| 电流 - 峰值输出： | 6A |
| 电源电压： | 1.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 4-UFDFN，4-TMLF? |
| 供应商设备封装： | 4-TMLF?（0.85x0.85） |
| 包装： | 标准包装 |
| 产品目录页面： | 1085 (CN2011-ZH PDF) |
| 其它名称： | 576-3345-6 |
Micrel, Inc.
MIC94080/1/2/3/4/5
Application Information
Power Switch SOA
The safe operating area (SOA) curve represents the
boundary of maximum safe operating current and
maximum safe operating junction temperature.
Figure 3. Simple Thermal Circuit
Now replacing the variables in the equation for Vx, 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
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
copper areas is discussed in the document “Designing
Figure 1. SOA Graph
The curves above show the SOA for various V IN ’s
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:
with Low Dropout Voltage Regulators” available from the
Micrel website (LDO Application Hints).
Example:
A switch is intended to drive a 1A load and is placed on
a printed circuit board which has a ground plane area of
at least 25mm by 25mm (625mm 2 ). The Voltage source
is a Li-ion battery with a lower operating threshold of 3V
and the ambient temperature of the assembly can be up
to 50oC.
Summary of variables:
I SW = 1A
V IN = 3V to 4.2V
T A = 50 o C
R θ JC = 85oC/W
R θ CA = 53oC/W Read from Graph in Figure 4
Figure 2. Simple Electrical Circuit
From this simple circuit we can calculate Vx if we know
Isource, Vz and the resistor values, Rxy and Ryz using
the equation:
Vx = Isource ? ( Rxy + Ryz ) + Vz
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 oC/W) and voltage sources
with temperature (in oC).
Figure 4. Excerpt from the LDO Book
January 2011
13
M9999-013111-D
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