ADP3309ARTZ-3.6-R7 查看數據表（PDF） - Analog Devices
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ADP3309ARTZ-3.6-R7 Datasheet PDF : 12 Pages
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ADP3309
APPLICATION CIRCUITS
CROSSOVER SWITCH
The circuit in Figure 23 shows that two ADP3309s can be used
to form a mixed supply voltage system. The output switches
between two different levels selected by an external digital
input. Output voltages can be any combination of voltages from
the Ordering Guide of the data sheet.
VIN = 4V TO 12V
OUTPUT SELECT
4V
0V
IN
OUT
ADP3309-2.7
SD GND
VOUT = 2.7V/3.3V
VIN = 4V TO 8V
C1
47µF
MJE253*
R1
50Ω
VOUT = 3.3V @ 1A
IN OUT
ADP3309-3.3
SD
ERR
GND
+ C2
10µF
*AAVID531002 HEAT SINK IS USED
Figure 24. Higher Output Current Linear Regulator
CONSTANT DROPOUT POST REGULATOR
C1 +
1µF
IN
OUT
ADP3309-3.3
+ C2
0.47µF
SD GND
Figure 23. Crossover Switch
The circuit in Figure 25 provides high precision with low
dropout 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 30 mW. The ADP3000 used in this circuit is a
switching regulator in the step-up configuration.
HIGHER OUTPUT CURRENT
The ADP3309 can source up to 100 mA without any heat sink
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 = 2.5V TO 3.5V
L1
6.8µF
D1
1N5817
C1
100µF
10V
R1
120Ω
ILIM
VIN SW1
ADP3000-ADJ
FB
GND SW2
C2
100µF
10V
R2
30.1kΩ
1%
Q1
2N3906
R3
124kΩ
1%
ADP3309-3.3
IN
OUT
SD GND
VOUT = 3.3V @ 100mA
+
Q2
2N3906
C3
2.2µF
R4
274kΩ
Figure 25. Constant Dropout Post Regulator
Rev. C | Page 11 of 12
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