59
SAMA5D3x-EK User Guide [USER GUIDE]
11180B–ATARM–29-Oct-13
5.2.2
Power Supplies
The SAMA5D3 series MB is supplied with a simple external 5 VCC power supply. The MB features one adjustable low-
dropout regulator (LDO). It accepts DC in 5V power and outputs a reg3.3V to most other circuits on the board
through four 3.3V rails.
5.2.2.1
Supply Group Configuration
The LDO is enabled through a dual FET scheme. The processor can assert SHDN (which is a VDDBU powered I/O) to
shut down the LDO to enter backup mode. The regulators on the CM board are also shut down by the action of the
SHDN signal.
If the 3V battery is mounted on J5, both the CM and the MB can be woken up by action on the BP2 button, which drives
the WKUP signal that is also a VDDBU powered I/O.
Figure 5-5.
MB Power Management
5V_INPUT
POWER_EN
PWR_EN#
PWR_EN
5V
5V
3V3
3V3
5V
3V3
SHDN
VDDISI
13
PWR_EN
3
5V/2A Input
FORCE
POWER
ON
VOUT =
0.8V x (Rtop + Rbottom)/Rbottom
Place C22 near MN3.pin2
R7
10k
R7
10k
Q6
IRLML2402
Q6
IRLML2402
1
3
2
R4
100k
R4
100k
C3
100n
C3
100n
C6
10u
C6
10u
JP5
SIP2
JP5
SIP2
1
2
C7
1u
C7
1u
MN2
BNX002-01
MN2
BNX002-01
B
1
PSG
3
CB
2
CG1
4
CG2
5
CG3
6
R25
10k
R25
10k
R8
10k
R8
10k
C22
1u
C22
1u
MN3
RT9018A
MN3
RT9018A
PGOOD
1
EN
2
VIN
3
VDD
4
NC
5
VOUT
6
ADJ
7
GND
8
EP
9
C9
10u
C9
10u
C1
100n
C1
100n
C5
10n
C5
10n
D2
Red
D2
Red
1
2
MN1
ZEN056V230A16LS
MN1
ZEN056V230A16LS
1
2
3
R3
470R
R3
470R
+
C2
33u
+
C2
33u
C8
1u
C8
1u
R5
15k
R5
15k
L1
220ohm at 100MHz
L1
220ohm at 100MHz
1
2
C10
15p
C10
15p
R2
47k
R2
47k
Q1
Si1563EDH
Q1
Si1563EDH
1
3
2
4
5
6
R1
100k
R1
100k
C120
1u
C120
1u
C57
100n
C57
100n
J4
DC POWER JACK
J4
DC POWER JACK
1
2
3
3V3
VBAT
3,12
J5
J5
JP4
SIP2
JP4
SIP2
1
2
D1
BAT54CLT1G
D1
BAT54CLT1G
1
3
2
C4
100n
C4
100n
5V
3V3
VDDIOP0
VDDIOP1
VDDIOM
VDDANA
TP4
TP4
TP2
TP2
TP8
TP8
TP1
TP1
TP7
TP7
TP3
TP3
TP5
TP5
TP6
TP6
