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TS39304 Fiches technique(PDF) 6 Page - Taiwan Semiconductor Company, Ltd

No de pièce TS39304
Description  3A Ultra Low Dropout Positive Voltage Regulator
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Fabricant  TSC [Taiwan Semiconductor Company, Ltd]
Site Internet  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS39304 Fiches technique(HTML) 6 Page - Taiwan Semiconductor Company, Ltd

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TS39301/2/3/4
6-7
2005/12 rev. A
Application Information (continues)
Error Flag
TS39301 versions feature an Error Flag, which looks
at the output voltage and signals an error condition
when this voltage drops 5% below its expected value.
The error flag is an open-collector output that pulls low
under fault conditions. It may sink 10mA. Low output
voltage signifies a number of possible problems,
including an over-current fault (the device is in current
limit) or low input voltage. The flag output is
inoperative
during
over
temperature
shutdown
conditions. A pull-up resistor from error flag to either
Vin or Vout is required for proper operation. For
information regarding the minimum and maximum
values of pull-up resistance, refer the graph as follow:
When the error flag is not used, it is best to leave
it open, the error flag pin can be tied directly to output
Pin.
Enable Input
TS39301/2/3/4 versions feature an active-high enable
(EN) input that allows ON/OFF control of the regulator.
Current drain reduces to “zero” when the device is
shutdown, with only micro-amperes of leakage current.
The EN input has TTL/CMOS compatible thresholds
for simple interfacing with logic interfacing. EN may be
directly tied to Vin and pulled up to the maximum
supply voltage.
Transient Response and 3.3V to 2.5V
or 2.5V to 1.8V Conversion
TS39301/2/3/4 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 47uF 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 TS39300 series regulator 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.
Power Dissipation
Determine the power dissipation requirements for the
design along with the maximum ambient temperature at
which the device will be operated.
Pd = (Vin- Vout) * Iout + Vin * Ignd
The heat sink thermal resistance is determined by:
Өsa = [Tj(max) – Ta] / Pd – (Өjc + Өcs)
When Tj(max) < 125
oC, and Өcs is between 0 oC and 2
oC/W, the heat sink may be significantly reduced in
applications where the input voltage is known and large
compare with the dropout voltage.
Output Sense
Sense pin can be connect to the load and traces the
load voltage, TS39303/4 will adjust the output voltage to
maintain the load at expected voltage.


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