Automotive Module Series
AG525R-GL QuecOpen
Hardware Design
AG525R-GL_QuecOpen_Hardware_Design 44 / 104
DC_3V8
C1
100 µF
+
3
D1
C
33 pF
C
100 nF
2
C
10 pF
4
VBAT_BB
Module
VBAT_RF
C6
100 nF
C7
33 pF
C8
10 pF
+
C5
100 µF
Figure 8: VBAT Reference Design
3.6.3. Reference Design for Power Supply
Power design for the module is very important, as the performance of the module largely depends on the
power source. If the voltage drop between the input and output is not too high, it is recommended to use
an LDO to supply power for the module. If there is a big voltage difference between the input source and
the desired output (VBAT), a buck converter is preferred to be used as the power supply.
The following figure shows a reference design for 12/24 V input power source. The designed output for
the power supply is about 3.8 V and the maximum rated current is 5 A.
2
4
1
3
6
7
8
18
2K
NM
10
0K
10
p
F
10
0 pF
10
0 nF
10
µ
F
470 µF
10
0 nF
10
0 nF
DC_IN
100 µH
5V_EN
100 nF
BOOT
VIN
EN
RT/CLK
SW
GND
COMP
FB
GN
D
TPS54560-Q1
7.2 µH
9
5
220 µF
1 µ
F
10
n
F
4.
3K
4.
7 n
F
4.
7 p
F
75
k
20
k
DC_3V8
Figure 9: 12/24 V Power Supply System Reference Design
To avoid damaging internal flash, do not switch off the power supply when the module works normally.
Only after the module is turned off by PWRKEY, the power supply can be cut off.
NOTE