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SPX2810M3-3.0 Datasheet(PDF) 5 Page - Sipex Corporation

Part # SPX2810M3-3.0
Description  1A Low Dropout Positive Linear Regulator
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SPX2810M3-3.0 Datasheet(HTML) 5 Page - Sipex Corporation

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Date: 5/25/04
SPX2810 1A Low Dropout Linear Regulator
© Copyright 2004 Sipex Corporation
PC BOARD
TOPSIDE COPPER
BACKSIDE COPPER
THERMAL RESISTANCE
AREA mm2
AREA mm2
AREA mm2
JUNCTION TO AMBIENT
°C/W
2500
2500
2500
46
2500
1250
2500
47
2500
950
2500
49
2500
2500
0
51
2500
1800
0
53
1600
600
1600
55
2500
1250
0
58
2500
915
0
59
1600
600
0
67
900
240
900
72
900
240
0
85
Figure 8. 600mA Current Source
Figure 9. Typical Adjustable Regulator
Ripple Rejection
Ripple rejection can be improved by adding a
capacitor between the ADJ pin and ground as
shown in Figure 6. When ADJ pin bypassing is
used, the value of the output capacitor required
increases to its maximum. If the ADJ pin is not
bypassed, the value of the output capacitor can
be lowered to 10(F for an electrolytic aluminum
capacitor or 2.2
µF for a solid tantalum capacitor
(Fig 10). However the value of the ADJ-bypass
capacitor should be chosen with respectto the
following equation:
C = 1 / ( 6.28 * F
R * R1 )
Where C = value of the capacitor in Farads
(select an equal or larger standard value),
F
R= ripple frequency in Hz,
R
1= value of resistor R1 in Ohms
If an ADJ-bypass capacitor is used, the
amplitude of the output ripple will be inde-
pendent of the output voltage. If an ADJ-
bypass capacitor is not used, the output ripple
will be proportional to the ratio of the output
voltage to the reference
voltage:
M = V
OUT / VREF
Where M = multiplier for the ripple seen when
the ADJ pin
is optimally bypassed.
V
REF =1.25V
TYPICAL APPLICATION CIRCUITS
LOAD
ADJ
SPX2810
V
IN
C
1
OUT
IN
4.7µF
C
2
I
OUT
R
1
V
REF
R
1
I
OUT =
+
IN
OUT
I ADJ
SPX2810
C1
R
1
R
2
VOUT
VIN
C
2
V
OUT =V REF (1+R 2 /R1) +I ADJ R 2
V
REF
50µA
ADJ
4.7µF +


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