ADP3303A Analog Devices, ADP3303A Datasheet - Page 8

• Manufacturer Part Number: ADP3303A
• Description: High Accuracy anyCAP Adjustable 200 mA Low Dropout Linear Regulator
• Manufacturer: Analog Devices

Figure 22. ADP3303A (TSSOP-14) Recommended Board
Layout
ADP3303A
Higher Output Current
The ADP3303A 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.
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.
TOP OF THE BOARD
V
10mm
IN
= 2.5V TO 3.5V
DRAWINGS NOT TO SCALE
100 F
10V
C1
BOTTOM OF THE BOARD
I
LIM
14-Lead Thin Shrink Small Outline Package (TSSOP)
ADP3000-ADJ
R1
120
GND
0.177 (4.50)
0.169 (4.30)
0.006 (0.15)
0.002 (0.05)
Figure 25. Constant Dropout Post Regulator
SEATING
10mm
PLANE
V
IN
SW2
6.8 H
L1
SW1
Dimensions shown in inches and (mm).
0.0256
(0.65)
14
BSC
1
PIN 1
FB
0.201 (5.10)
0.193 (4.90)
OUTLINE DIMENSIONS
0.0118 (0.30)
0.0075 (0.19)
1N5817
D1
8
7
(RU-14)
C2
100 F
10V
–8–
2N3906
0.256 (6.50)
0.246 (6.25)
0.0433
(1.10)
MAX
Q1
0.0035 (0.090)
0.0079 (0.20)
V
*AAVOD531002 HEAT SINK IS USED
V
IN
IN
OUTPUT SELECT
R2
30.1k
1%
R3
124k
1%
= 5.5V TO 12V
= 6V TO 8V
Figure 24. High Output Current Linear Regulator
IN
SD
ADP3303A
5V
0V
8°
0°
47 F
GND
C1
0.028 (0.70)
0.020 (0.50)
OUT
FB
Figure 23. Crossover Switch
1.0 F
R5
121k
R6
68.1k
C1
50
SD
R1
ADP3303A
MJE253*
GND
Q2
2N3906
R4
274k
IN
SD
IN
SD
IN
ERR
ADP3303A
ADP3303A
OUT
FB
C3
2.2 F
GND
GND
3.3V @ 160mA
C2
10 F
OUT
OUT
FB
FB
110k
73.2k
187k
57.6k
187k
57.6k
V
OUT
C2
1.0 F
V
= 5V @ 1A
OUT
REV. A
= 5V/3V