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TS5218 Datasheet, PDF (3/7 Pages) Taiwan Semiconductor Company, Ltd – 800mA Ultra Low Dropout Voltage Regulator with Enable
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Functional Diagram

TS5218
800mA Ultra Low Dropout
Voltage Regulator with Enable
Application Information
The TS5218 is high performance with low dropout voltage regulator suitable for moderate to high current and voltage
regulator application. Its 700mV dropout voltage at full load and over temperature makes it especially valuable in
battery power systems and as high efficiency noise filters in post regulator applications. Unlike normal NPN transistor
design, where the base to emitter voltage drop and collector to emitter saturation voltage limit the minimum dropout
voltage, dropout performance of the PNP output of these devices is limited only by low VCE saturation voltage.
The TS5218 is fully protected from damage due to fault conditions. Linear current limiting is provided. Output current
during overload conditions is constant. Thermal shutdown the device when the die temperature exceeds the maximum
safe operating temperature. Transient protection allows device survival even when the input voltage spikes above and
below nominal. The output structure of these regulators allows voltages in excess of the desired output voltage to be
applied without reverse current flow.
Output Capacitor Requirement
The TS5218 requires an output capacitor to maintain stability and improve transient response is necessary. The value
of this capacitor is dependent upon the output current, lower currents allow smaller capacitors. TS5218 output
capacitor selection is dependent upon the ESR of the output capacitor to maintain stability. When the output capacitor
is 10uF or greater, the output capacitor should have an ESR less than 2Ω. This will improve transient response as well
as promote stability. Ultra low ESR capacitors (<100mΩ), such as ceramic chip capacitors, may promote instability.
These very low ESR levels may cause an oscillation and/or under damped transient response. A low ESR solid
tantalum capacitor works extremely well and provides good transient response and stability over temperature
aluminum electrolytes can also be used, as long as the ESR of the capacitor is <2Ω. The value of the output capacitor
can be increased without limit. Higher capacitance values help to improve transient response and ripple rejection and
reduce output noise.
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Version: A09
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