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ILC7280CS-3030 参数 Datasheet PDF下载

ILC7280CS-3030图片预览
型号: ILC7280CS-3030
PDF下载: 下载PDF文件 查看货源
内容描述: 与75DB纹波抑制微功耗双150MA CMOS射频LDO稳压器 [MICROPOWER DUAL 150MA CMOS RF LDO REGULATORS WITH 75DB RIPPLE REJECTION]
分类和应用: 稳压器调节器电源电路射频光电二极管输出元件
文件页数/大小: 9 页 / 66 K
品牌: IMPALA [ Impala Linear Corporation ]
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Advance  
Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection  
APPLICATIONS INFORMATION cont.  
Thermal Considerations  
For optimum Thermal dissipation and device reliability,  
devices mounted on conventional FR4 PCB material  
should be surrounded and connected to as much ground  
copper as possible. In a worse case application with min-  
imum trace widths and no ground plane, the MSOP-8  
package exhibits a thermal resistance of 200 °C/W. The  
risk to the device can be calculated in the following exam-  
ples. (An Excel spreadsheet calculator is also available at  
the Impala Linear web site: Products/ILC7280.)  
Thermal Evaluation Examples  
For an ambient temperature of 50°C, the maximum pack-  
age power dissipation is:  
P D(max) = (125°C - 50°C) / 200°C/W  
P D(max) = 375mW  
If the intent is to operate from a 4V power source with a  
150mA load current from both outputs at a 50°C ambient  
temperature, the expected power dissipation is found in  
the following calculation:  
P D(each regulator) = (VIN - VOUT) * IOUT + (VIN * IGND  
)
P D(each regulator) = (4V - 3V) * 150mA + (4V * 0.12mA)  
P D(each regulator) = 150mW  
P D(both regulators) = 2 * 150mW  
P D(both regulators) = 300mW  
In this example the total power dissipated is 300mW which  
is below the 375mW maximum package consideration and  
therefore safe to operate. It should be noted that it is not  
always possible to operate both regulators at the maximum  
output current. For example in a 5V input and 3V output  
application at 50°C, one regulator operating at 150ma  
would dissipate 267.5mW. The remaining regulator must  
be limited to 375mW - 267.5mW or 107.5mW.  
An advantage of the ILC7280 low-dropout voltage charac-  
teristic is that using the lowest possible input voltage can  
minimize power dissipation.  
Impala Linear Corporation  
(408) 574-3939  
ILC7280 1.8  
www.impalalinear.com  
May 2000  
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