SPX1521M3 Просмотр технического описания (PDF) - Signal Processing Technologies
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SPX1521M3 Datasheet PDF : 8 Pages
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External Capacitors
The stability of the SPX1521 requires a
2.2µF or greater capacitor between output
and ground. Oscillation could occur without
this capacitor. Most types of tantalum or
aluminum electrolytic works fine here. For
operations of below -25°C solid tantalum is
recommended since the many aluminum
types have electrolytes that freeze at about
-30°C. The ESR of about 5Ω or less and
resonant frequency above 500kHz are the
most important parameters in the value of
the capacitor. The capacitor value can be
increased without limit.
The SPX1521, unlike other low dropout
regulators will remain stable and in regula-
tion with no load in addition to the internal
voltage divider. This feature is especially
important in applications like CMOS RAM
keep-alive.
APPLICATION INFORMATION
If there is more than 10 inches of wire be-
tween the input and the AC filter capacitor,
or if a battery is used as the input, then a
0.1µF tantalum or aluminum electrolytic
capacitor should be placed from the input
to the ground.
Reducing Output Noise
It may be an advantage to reduce the AC
noise present at the output. One way is to re-
duce the regulator bandwidth by increasing
the size of the output capacitor. Increasing
the capacitor from 1µF to 220µF only de-
creases the noise from 430µV to 160µVrms
for a 100kHz bandwidth at 5V output.
Note: Tab is connected to GND
SOT-223 (M3)
TO-263-3 (T)
SPX1521
1 23
SPX1521
123
VIN GND VOUT
Top View
VOUT GND VIN
Top View
Thermal Resistance (Theta JA)
SOT-223 ------62.3ºC/W
TO-262 ------31.4ºC/W
TO-220 ------29.4ºC/W
TO-252 ------50.0ºC/W
TO-220-3 (U)
SPX1521
1 23
VOUT GND VIN
Front View
May15-07
SPX1521 300mA Low Dropout Voltage Regulator
PINOUTS
TO-252 (R)
3
2
1
Front View
VIN
GND
VOUT
© 2007 Sipex Corporation
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