ADP3307 데이터 시트보기 (PDF) - Analog Devices
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ADP3307 Datasheet PDF : 8 Pages
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ADP3307
Constant Dropout Post Regulator
The circuit in Figure 6 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 30 mW. The ADP3000 used in this circuit is a switching
regulator in the step-up configuration.
L1
6.8H
D1
1N5817
ADP3307-3.3
VIN = 2.5V TO 3.5V
IN
OUT
3.3V@100mA
C1
100F
10V
R1
120⍀
C2
100F
10V
SD
R2
30.1k⍀
GND
+ C3
2.2F
ILIM
VIN
SW1
ADP3000-ADJ
FB
GND SW2
1%
Q1
2N3906
R3
124k⍀
1%
E Figure 6. Constant Dropout Post Regulator
Q2
2N3906
R4
274k⍀
T OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
6-Lead Plastic Surface Mount
E (RT-6)
0.122 (3.10)
0.106 (2.70)
L 0.071 (1.80)
0.059 (1.50)
6
5
4
1
2
3
0.118 (3.00)
0.098 (2.50)
O PIN 1
S 0.051 (1.30)
0.035 (0.90)
0.006 (0.15)
ADP3307–RevisionOHistory B0.000(0.00)
0.075
(1.90)
BSC
0.037
(0.95) BSC
0.057 (1.45)
0.035 (0.90)
0.020 (0.50)
0.010 (0.25)
SEATING
PLANE
10؇
0؇
0.009 (0.23)
0.003 (0.08)
0.022 (0.55)
0.014 (0.35)
Location
Page
Data Sheet changed from REV. 0 to REV. A.
Edits to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Edits to GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Addition to the ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Edit to Calculating Junction Temperature section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Edits to Figure 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
–8–
REV. A
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