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TS5215CS 数据表(PDF) 5 Page - Taiwan Semiconductor Company, Ltd |
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TS5215CS 数据表(HTML) 5 Page - Taiwan Semiconductor Company, Ltd |
5 / 7 page TS5215 series 5-5 2006/01 rev. C Application Information (continues) Thermal Characteristics TS5215 series is designed to provide 300mA of continuous current in a very small package. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part. To determine the maximum power dissipation of the package, use the junction-ambient thermal resistance of the device and the following basic equation: Pd(max) = [ Tj(max) – Ta ] /Θja Tj(max) is the maximum junction temperature of the die(125 oC), and Ta is the ambient operating temperature. Θja is layout dependent, the actual power dissipation of the regulator circuit can be determined using the equation: Pd = ( Vin – Vout ) * Iout + Vin * Ignd Substituting Pd(max) for Pd and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For example, when operating the TS5215CX533 at room temperature with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: Pd(max) = (125 oC – 25oC) / 220oC/W Pd(max) = 455mW The junction to ambient thermal resistance for the minimum footprint is 220 oC/W, the maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 3.3V and an output current of 300mA, the maximum input voltage can be determined. Form the electrical characteristics table, the maximum ground current for 300mA output current is 2.5mA. 445mW = ( Vin – 3.3V ) * 300mA + Vin * 2.5mA 445mW = Vin * 300mA – 3.3 * 300mA + Vin * 2.5mA 445mW = Vin * 300mA – 990mW + Vin * 2.5mA 1435mW = Vin * 302.5mA Vin(max) = 4.74v Therefore, a 3.3V application at 300mA of output current can accept a maximum input voltage of 4.74V in a SOT-25 package. Fixed Output Regulator Application Ultra Low Noise Fixed Voltage Application Includes a 470uF capacitor for low noise operation and shows EN connected to IN for an application where enable/shutdown is not required. Cout= 2.2uF minimum. Low Noise Fixed Voltage Application An example of a low noise configuration where Cbypass is not required. Cout= 1uF minimum Reference Voltage Output Application An example of reference voltage (1.23V) as the output voltage when adjustable pin connect to output. |
类似零件编号 - TS5215CS |
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类似说明 - TS5215CS |
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