Datasheet

ADP1828
Rev. C | Page 30 of 36
To achieve an accurate output voltage, proper grounding of the
AGND and PGND planes is needed. For light to medium loads,
connecting the AGND plane to the PGND plane with a trace is
adequate in obtaining good output accuracy (see Figure 52). If
the PGND plane is large enough and under a light to medium
load, the voltage drop across the PGND plane is negligible.
However, under a heavy load, such as at 20 A, the voltage drop
across the PGND plane could be significant, thus affecting the
accuracy of the output. The AGND plane would then have to
be routed directly to the negative terminal of the load and the
power supply, as illustrated in Figure 53. The power supply
GND terminal and the load GND terminal should be placed
as close as possible to each other to minimize the voltage drop
across these two terminals, thus improving the output accuracy.
POWER SUPPLY GND TERMINAL IS
CONNECTED TO PGND PLANE.
AGND
PLANE
PGND PLANE
V
OUT
LOAD
POWER
SUPPLY
GND
TERMINAL
0
6865-053
Figure 52. Grounding Technique for a Light to Medium Load
POWER SUPPLY GND TERMINAL IS
CONNECTED TO PGND PLANE.
AGND
PLANE
PGND PLANE
SMALL
AGND TRACE
V
OUT
LOAD
POWER
SUPPLY
GND
TERMINAL
0
6865-054
Figure 53. Proper Grounding Technique for a Heavy Load
RECOMMENDED COMPONENT MANUFACTURERS
Table 5.
Vendor Components
AVX Corporation Capacitors
Central Semiconductor Corp. Diodes
Coilcraft, Inc. Inductors
Diodes, Inc. Diodes
International Rectifier Diodes, MOSFETs
Murata Manufacturing Co., Ltd. Capacitors, inductors
ON Semiconductor Diodes, MOSFETs
Rubycon Corporation Capacitors
Sanyo Capacitors
Sumida Corporation Inductors
Taiyo Yuden, Inc. Capacitors, inductors
Toko America, Inc. Inductors
United Chemi-Con, Inc. Capacitors
Vishay Siliconix Diodes, MOSFETs, resistors, capacitors
Wurth Elektronic Inductors