ADP3303 データシートの表示（PDF） - Analog Devices
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ADP3303 Datasheet PDF : 9 Pages
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ADP3303
VIN = 5.5V TO 12V
OUTPUT SELECT
5V
0V
IN
OUT
ADP3303-5.0
SD
GND
VOUT = 5V/3.3V
C1
1.0F
IN
OUT
ADP3303-3.3
SD
GND
C2
0.47F
Figure 23. Crossover Switch
Higher Output Current
The ADP3303 can source up to 200 mA without any heatsink
or pass transistor. If higher current is needed, an appropriate
pass transistor can be used, as in Figure 24, to increase the
output current to 1 A.
VIN = 6V TO 8V
C1
47F
MJE253*
R1
50⍀
VOUT = 5V @ 1A
IN OUT
ADP3303-5
SD
ERR
GND
C2
10F
*AAVID531002 HEATSINK IS USED
Figure 24. High Output Current Linear Regulator
Constant Dropout Post Regulator
The circuit in Figure 25 provides high precision with low drop-
out for any regulated output voltage. It significantly reduces the
ripple from a switching regulator while providing a constant
dropout voltage, which limits the power dissipation of the LDO
to 60 mW. The ADP3000 used in this circuit is a switching
regulator in the step-up configuration.
VIN = 2.5V TO 3.5V
C1
100F
10V
L1
6.8H
R1
120⍀
ILIM
VIN
SW1
ADP3000-ADJ
GND SW2 FB
D1
1N5817
C2
100F
10V
ADP3303-3.3
IN
OUT
SD
R2
30.1k⍀
1%
GND
Q1
2N3906
R3
124k⍀
1%
3.3V @ 160mA
C3
2.2F
Q2
2N3906
R4
274k⍀
Figure 25. Constant Dropout Post Regulator
–8–
REV. B
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