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TS39105CP450RO bảng dữ liệu(PDF) 3 Page - Taiwan Semiconductor Company, Ltd

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TS39105CP450RO bảng dữ liệu(HTML) 3 Page - Taiwan Semiconductor Company, Ltd

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TS39105
1A Ultra Low LDO with Enable
3/7
Version: A08
Functional Diagram
Application Information
The TS39105 are high performance with low dropout voltage regulator suitable for moderate to high current and
voltage regulator application. Its 630mV 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 TS39105 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 TS39105 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. TS39105 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.
Input Capacitor Requirement
An input capacitor of 1uF or greater is recommended when the device is more than 4” away from the bulk AC supply
capacitance or when the supply is a battery. Small, surface mount, ceramic chip capacitors can be used for bypassing.
Larger values will help to improve ripple rejection by bypassing the input to the regulator, further improving the integrity
of the output voltage.
Minimum Load Current
The TS39105 is specified between finite loads. If the output current is too small leakage currents dominate and the
output voltage rises. A 10mA minimum load current is necessary for proper regulation


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