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TS39100CW18RP Fiches technique(PDF) 4 Page - Taiwan Semiconductor Company, Ltd

No de pièce TS39100CW18RP
Description  1A Ultra Low Dropout Voltage Regulator
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Fabricant  TSC [Taiwan Semiconductor Company, Ltd]
Site Internet  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS39100CW18RP Fiches technique(HTML) 4 Page - Taiwan Semiconductor Company, Ltd

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TS39100
1A Ultra Low Dropout Voltage Regulator
4/7
Version: C11
Application Information (Continue)
Transient Response and 3.3V to 2.5V or 2.5V to 1.8V Conversion
TS39100 has excellent transient response to variations in input voltage and load current. The device have been
designed to respond quickly to load current variations and input voltage variations. Large output capacitors are not
required to obtain this performance. A standard 10uF output capacitor, preferably tantalum, is all that is required.
Larger values help to improve performance even further. By virtue of its low dropout voltage, this device does not
saturate into dropout as readily as similar NPN base designs. When converting from 3.3V to 2.5V or 2.5V to 1.8V,
the NPN based regulators are already operating in dropout, with typical dropout requirements of 1.2V or greater,.
To convert down to 2.5V or 1.8V without operating in dropout, NPN based regulators require an input voltage of
3.7V at the very least. The TS39100 will provide excellent performance with an input as low as 3.0V or 2.5V
respectively. This gives the PNP based regulators a distinct advantage over older, NPN based linear regulators.
Copper area lay out information
Determine the power dissipation requirements for the design along with the maximum ambient temperature at
which the device will be operated. Refer to power dissipation with copper area curve, which shows safe operating
curves for three different ambient temperatures with 25
oC, 50oC, 85oC. From these curves, the minimum amount of
copper can be determined by knowing the maximum power dissipation required.
PD = (VIN- VOUT) * IOUT + VIN * IGND
If we used a 5.0V output device and a 6V input at an output current of 350mA, then the power dissipation is as
follows:
PD = (6.0V- 5.0V) * 350mA + 5V * 4mA
PD = 350mW + 20mW
PD = 370mW
If the maximum ambient temperature is 85
oC and the power dissipation is as above 375mW, the curve is shows
that the required area of copper is 80mm
2.


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