TYPICAL APPLICATION
Fig. 1 Adjustable Regulator
3.3V
VIN
5V
VCTRL
C1
330uF
VIN
5
4
VCTRL
C2
10uF
3
SPX1580
1
2
ADJ
VOUT
SENSE
C3
330pF
(1) VCTRL needed when VIN < 5V.
(2) VOUT = VREF (1 + R2/ R1) + I ADJ R2.
(3) VREF is measured across adjust to sense.
R1
124 Ω
R2
124 Ω
SPX1580
2.5V
VOUT
C4
2 X 330uF
3.3V
VIN
5V
VCTRL
Fig.2 Typical Fixed Regulator
C1
330uF
V IN
5 SPX1580
3
VOUT
4
VCTRL
C2
10uF
1
2
GND
SENSE
2.5V
VOUT
C4
2 X 330uF
(1) VCTRL is needed when VIN <5V.
Rev. 11/21/00