N720 OpenLinux
Hardware User Guide
Copyright © Neoway Technology Co., Ltd
16
Figure 3-1 Current peaks and voltage drops
Keep voltage above 3.3V
3.3V
0 ms
3.7 ms
7.4 ms
10.7 ms
T
Imax 2A
Voltage
Input
current
3.8V
min
max
0.577ms
2.308ms
The power supply design covers two parts: schematic design and PCB layout.
Schematic Design
Design the circuit of the power supply for N720 OpenLinux based on the input voltage you
choose.Generally there are three types of input voltages:
3.3V-4.3V (3.8V typically, output by battery)
4.3V-5.5V (5.0V typically, output by rectifier inside a computer)
5.5V-24V (12V typically, output by vehicle battery)
Figure 3-2 shows schematic design recommended for 3.3V-4.3V input.
Figure 3-2 Recommended design 1
Power Supply
N720
Module
TVS
C1
C2
C3
C4
Close to the pin of the module
VBAT
Test point
I_max
C5
