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TS2937CM12RN Datasheet(PDF) 3 Page - Taiwan Semiconductor Company, Ltd

No. de pieza TS2937CM12RN
Descripción Electrónicos  500mA Ultra Low Dropout Voltage Regulator
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Fabricante Electrónico  TSC [Taiwan Semiconductor Company, Ltd]
Página de inicio  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS2937CM12RN Datasheet(HTML) 3 Page - Taiwan Semiconductor Company, Ltd

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TS2937
500mA Ultra Low Dropout Voltage Regulator
3/10
Version: D13
Application Information
The TS2937 series is a high performance with low dropout voltage regulator suitable for moderate to high current
and voltage regulator application. Its 600mV(typ) 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 TS2937 series 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.
Typical Application Circuit
Output Capacitor
The TS2937 series requires an output capacitor to maintain stability and improve transient response. Proper
capacitor selection is important to ensure proper operation. The output capacitor selection is dependent upon the
ESR of the output capacitor the maintain stability. When the output capacitor is 10uF or greater, the output
capacitor should have an ESR less than 2 ohm. This will improve transient response as well as promoted stability.
Ultra low ESR capacitors (<100mohm), 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 electrolytic
can also be used, as long as the ESR of the capacitor is <2ohm. The value of the output capacitor can be
increased without limit. Higher capacitance values help to improved transient response and ripple rejection and
reduce output noise.
Minimum Load Current
The TS2937 series is specified between finite loads. If the output current is too small leakage currents dominate
and the output voltage rises. A 1mA minimum load current is necessary for proper regulation.
Input Capacitor
An input capacitor of 1uF or greater is recommended when the device is more that 4 inches away from the bulk AC
supply capacitance or when the supply is a battery. Small and 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.


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