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## TS5205 Datasheet(PDF) 5 Page - Taiwan Semiconductor Company, Ltd

 Part No. TS5205 Description 150mA Low Noise LDO Voltage Regulator with Enable Download 6 Pages Scroll/Zoom 100% Maker TSC [Taiwan Semiconductor Company, Ltd] Homepage http://www.taiwansemi.com Logo

## TS5205 Datasheet(HTML) 5 Page - Taiwan Semiconductor Company, Ltd

 5 / 6 page TS5205 series5-62004/09 rev. AApplication Information (continues)Thermal CharacteristicsTS5205 series is designed to provide 150mA ofcontinuous current in a very small package. Maximumpower dissipation can be calculated based on theoutput current and the voltage drop across the part. Todetermine the maximum power dissipation of thepackage, use the junction-ambient thermal resistanceof the device and the following basic equation:Pd(max) = [ Tj(max) – Ta ] /ΘjaTj(max) is the maximum junction temperature of thedie(125oC), and Ta is the ambient operatingtemperature. Θja is layout dependent, the actual powerdissipation of the regulator circuit can be determinedusing the equation:Pd = ( Vin – Vout ) * Iout + Vin * IgndSubstituting Pd(max) for Pd and solving for theoperating conditions that are critical to the applicationwill give the maximum operating conditions for theregulator circuit. For example, when operating theTS5205CX533 at room temperature with a minimumfootprint layout, the maximum input voltage for a setoutput current can be determined as follows:Pd(max) = (125oC – 25oC) / 220oC/WPd(max) = 455mWThe junction to ambient thermal resistance for theminimum footprint is 220oC/W, the maximum powerdissipation must not be exceeded for proper operation.Using the output voltage of 3.3V and an output currentof 150mA, the maximum input voltage can bedetermined. Formt eh electrical characteristics table,the maximum ground current for 150mA output currentis 2.5mA.445mW = ( Vin – 3.3V ) * 150mA + Vin * 2.5mA445mW = Vin * 150mA – 3.3 * 150mA + Vin * 2.5mA445mW = Vin * 150mA – 495mW + Vin * 2.5mA950mW = Vin * 152.5mAVin(max) = 6.23vTherefore, a 3.3V application at 150mA of outputcurrent can accept a maximum input voltage of 6.23Vin a SOT-25 package.Fixed Output Regulator ApplicationUltra Low Noise Fixed Voltage ApplicationIncludes a 470uF capacitor for low noise operation andshows EN connected to IN for an application whereenable/shutdownisnotrequired.Cout=2.2uFminimum.Low Noise Fixed Voltage ApplicationAn example of a low noise configuration where Cbypassis not required. Cout= 1uF minimum

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