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ILC7280CS-2530 データシート(PDF) 8 Page - Impala Linear Corporation |
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ILC7280CS-2530 データシート(HTML) 8 Page - Impala Linear Corporation |
8 / 9 page Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection Impala Linear Corporation 8 (408) 574-3939 www.impalalinear.com May 2000 ILC7280 1.8 Advance 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. APPLICATIONS INFORMATION cont. |
同様の部品番号 - ILC7280CS-2530 |
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同様の説明 - ILC7280CS-2530 |
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