ADP3300_01 Просмотр технического описания (PDF) - Analog Devices
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ADP3300_01 Datasheet PDF : 8 Pages
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ADP3300
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 15 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
ADP3300-5
IN
OUT
SD
R2
30.1k⍀
1%
GND
Q1
2N3906
R3
124k⍀
1%
5V @ 50mA
C3
2.2F
Q2
2N3906
R4
274k⍀
Figure 6. Constant Dropout Post Regulator
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
6-Lead Surface Mount Package
(SOT-23)
0.122 (3.10)
0.106 (2.70)
6
5
4
0.071 (1.80)
0.118 (3.00)
0.059 (1.50)
0.098 (2.50)
1
2
3
PIN 1
0.051 (1.30)
0.035 (0.90)
0.006 (0.15)
0.000 (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)
ADP3300–Revision History
Location
Page
Data Sheet changed from REV. A to REV. B.
Edits to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Edits to GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Edits to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Addition to the ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
–8–
REV. B
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