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## TS5204 Datasheet(PDF) 3 Page - Taiwan Semiconductor Company, Ltd

 Part No. TS5204 Description 150mA Low Noise LDO Voltage Regulator Download 4 Pages Scroll/Zoom 100% Maker TSC [Taiwan Semiconductor Company, Ltd] Homepage http://www.taiwansemi.com Logo

## TS5204 Datasheet(HTML) 3 Page - Taiwan Semiconductor Company, Ltd

 3 / 4 page TS5204 series3-42004/09 rev. AApplication InformationThermal CharacteristicsTS5204 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 resistance ofthe 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 theTS5204CX33 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, themaximum ground current for 150mA output current is2.5mA.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 6.23V ina SOT-23 package.Input Capacitor RequirementAn input capacitor of 1uF or greater is recommendedwhen the device is more than 10” away from the bulkAC supply capacitance or when the supply is a battery.Output Capacitor RequirementThe TS5204 series requires an output capacitor tomaintain stability and improve transient response isnecessary. 2.2uF minimum is recommended. Largervalues improve the regulator’s transient response. Theoutput capacitor value may be increased without limit.The output capacitor should have an ESR (effectiveseries resistance) less than 5Ω and a resonantfrequency above 1MHz. Ultra low ESR capacitors cancause a low amplitude oscillation on the output and/orunder damped transient response. Most of tantalum oraluminum electrolytic capacitors are adequate; filmtypes will work. Since many aluminum electrolytic haveelectrolytes that freeze at about –30oC, solid tantalumsare recommended for operation below –25oC. At lowervalues of output current, less output capacitance isrequired for output stability. The capacitor can bereduced to 0.47uF for current below 10mA or 0.33uFfor currents below 1mA.No Load StabilityThe TS5204 series iwill remain stable and in regulationwith no load, unlike many other voltage regulators.This is especially important in CMOS RAM keep aliveapplications.Dual Supply OperationWhen used in dual supply systems where the regulatorload is returned to a negative supply, the outputvoltage must be diode clamped to ground.

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