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SPX1521M3-L-5-0 Datasheet(PDF) 3 Page - Sipex Corporation

Part # SPX1521M3-L-5-0
Description  300mA Low Dropout Voltage Regulator
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SPX1521M3-L-5-0 Datasheet(HTML) 3 Page - Sipex Corporation

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3
May5-07
SPX52300mALowDropoutVoltageRegulator
©2007SipexCorporation
External Capacitors
The stability of the SPX52 requires a
2.2µForgreatercapacitorbetweenoutput
andground.Oscillationcouldoccurwithout
this capacitor.Most types of tantalum or
aluminum electrolytic works fine here. For
operationsofbelow-25°Csolidtantalumis
recommended since the many aluminum
typeshaveelectrolytesthatfreezeatabout
-30°C. The ESR of about 5Ω or less and
resonantfrequencyabove500kHzarethe
mostimportantparametersinthevalueof
thecapacitor.Thecapacitorvaluecanbe
increasedwithoutlimit.
The SPX52, unlike other low dropout
regulatorswillremainstableandinregula-
tionwithnoloadinadditiontotheinternal
voltage divider.This feature is especially
important in applications like CMOS RAM
keep-alive.
Ifthereismorethan0inchesofwirebe-
tween the input and the AC filter capacitor,
orifabatteryisusedastheinput,thena
0.µF tantalum or aluminum electrolytic
capacitorshouldbeplacedfromtheinput
totheground.
Reducing Output Noise
ItmaybeanadvantagetoreducetheAC
noisepresentattheoutput.Onewayistore-
ducetheregulatorbandwidthbyincreasing
thesizeoftheoutputcapacitor.Increasing
thecapacitorfromµFto220µFonlyde-
creasesthenoisefrom430µVto60µVrms
fora00kHzbandwidthat5Voutput.
APPLICATION INFORMATION
Top View
SPX1521
1
3
2
SOT-223 (M3)
Top View
TO-263-3 (T)
1
SPX1521
2
3
Front View
TO-220-3 (U)
SPX1521
1
2 3
Front View
TO-252 (R)
3
2
1
V
IN GND VOUT
V
OUT GND VIN
VOUT GND VIN
V
OUT
GND
VIN
PINOUTS
Note:TabisconnectedtoGND
ThermalResistance(ThetaJA)
SOT-223------62.3ºC/W
TO-262------3.4ºC/W
TO-220------29.4ºC/W
TO-252------50.0ºC/W


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