SPX1202 View Datasheet(PDF) - Signal Processing Technologies
Part Name
Description
Manufacturer
SPX1202 Datasheet PDF : 12 Pages
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tude of the output ripple will be independent 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 /V
OUT REF
Where M = multiplier for the ripple seen when
the ADJ pin is optimally bypassed.
V =1.25V
REF
Output Voltage
The output of the adjustable regulator can be set
to any voltage between 1.25V and 15V. The
value of V can be quickly approximated
OUT
using the formula. (Figure 9)
V =1.25 *(R + R )/R .
OUT
1
21
A small correction to this formula is required
depending on the values of resistors R1 and R2,
since adjustable pin current (approx 50A) flows
through R2. When IADJ is taken into account, the
formula becomes
V = V (1+ (R /R )) + I * R ,
OUT
REF
21
ADJ 2
where VREF=1.25V.
PC BOARD
AREA mm2
TOPSIDE COPPER BACKSIDE COPPER
AREA mm2
AREA mm2
2500
2500
2500
2500
1250
2500
2500
950
2500
2500
2500
0
2500
1800
0
1600
600
1600
2500
1250
0
2500
915
0
1600
600
0
900
240
900
900
240
0
Table 1
THERMAL RESISTANCE
JUNCTION TO AMBIENT
C/W
46
47
49
51
53
55
58
59
67
72
85
TYPICAL APPLICATIONS
V IN
IN
4.7F + C 1
SPX1202
ADJ
IOUT=
VREF
R1
OUT
C2
R1
IOUT
LOAD
VIN
IN
4.7F + C1
SPX1202
ADJ
I ADJ
50A
VOUT = V REF (1+R 2 /R1) +IADJR 2
OUT
VREF R1
VOUT
C2
R2
Figure 8. 600mA Current Source
Mar13-07
Figure 9. Typical Adjustable Regulator
SPX1202 600 mA Low Dropout Linear Regulator
© 2007 Sipex Corporation
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