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MIC3975-3.0BMM 参数 Datasheet PDF下载

MIC3975-3.0BMM图片预览
型号: MIC3975-3.0BMM
PDF下载: 下载PDF文件 查看货源
内容描述: 750毫安UCAP低电压低压差稳压器 [750mA UCap Low-Voltage Low-Dropout Regulator]
分类和应用: 稳压器
文件页数/大小: 12 页 / 107 K
品牌: MICREL [ MICREL SEMICONDUCTOR ]
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MIC3975  
T = T  
Micrel  
Quick Method  
T  
J(max)  
A(max)  
Determine the power dissipation requirements for the design  
along with the maximum ambient temperature at which the  
device will be operated. Refer to Figure 5, which shows safe  
operating curves for three different ambient temperatures:  
25°C, 50°C and 85°C. From these curves, the minimum  
amount of copper can be determined by knowing the maxi-  
mum power dissipation required. If the maximum ambient  
temperature is 50°C and the power dissipation is as above,  
625mW, the curve in Figure 5 shows that the required area of  
T
T
= 125°C  
J(max)  
A(max)  
= maximum ambient operating temperature  
Forexample, themaximumambienttemperatureis50°C, the  
T is determined as follows:  
T = 125°C 50°C  
T = 75°C  
Using Figure 4, the minimum amount of required copper can  
be determined based on the required power dissipation.  
Power dissipation in a linear regulator is calculated as fol-  
lows:  
2
copper is 160mm .  
The θ of this package is ideally 80°C/W, but it will vary  
JA  
depending upon the availability of copper ground plane to  
which it is attached.  
P = (V V  
) I  
+ V × I  
D
IN  
OUT OUT IN GND  
If we use a 2.5V output device and a 3.3V input at an output  
current of 750mA, then our power dissipation is as follows:  
P = (3.3V 2.5V) × 750mA + 3.3V × 7.5mA  
D
P = 600mW + 25mW  
D
P = 625mW  
D
From Figure 4, the minimum amount of copper required to  
2
operate this application at a T of 75°C is 160mm .  
February 2003  
11  
MIC3975