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TS5215CY533 датащи(PDF) 5 Page - Taiwan Semiconductor Company, Ltd |
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TS5215CY533 датащи(HTML) 5 Page - Taiwan Semiconductor Company, Ltd |
5 / 9 page TS5215 300mA Low Noise LDO Voltage Regulator with Enable 5/9 Version: B07 Application Information (Continue) Dual Supply Operation When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground. Thermal Characteristics TS5215 series is designed to provide 300mA (5V version) 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 TS5215CX33 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 120mA, the maximum input voltage can be determined. From the electrical characteristics table, the maximum ground current for 120mA 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 Design Ultra Low Noise Fixed Voltage Application Includes a 470pF 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 bypass is not required. COUT= 2.2uF minimum VOUT VIN EN on off COUT 2.2uF TS5215CX5xx VIN VOUT COUT 2.2uF CBYP 470pF TS5215CX5xx |
Аналогичный номер детали - TS5215CY533 |
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Аналогичное описание - TS5215CY533 |
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