NXP Semiconductors QorIQ LS1043ARDB - Power Supply Operation: Power ON and Sequencing; Power ON Procedure

AQR105-B1 core
0.85 V @ 3.2 A
Core ~8 W
12V/5A
power
supply
+1.0 V @ 10 A
+3.3 V @ 12 A
VR500
(FSL)
SW1
SW2
SW3
SW4
LDO1
LDO2
LDO3
LDO4
LDO5
REFOUT
LT3065
LTM464
Channel 1
Channel 3
Channel 2
Channel 4
S1DD
1.0V@0.5
A
LT3065
1.5 V
1.8 V
1.2 V
0.6 V
+5 V @ 4 A
1.35 V
mPCIE_1V5
1.5 V @ 0.5 A
CPLD, flash, mux,
PHY, others
3.3 V
LT3085
No use
2.50 V
DDR4 VTT
0.6 V @ 0.2 A
2.50 V
No use
1.80 V
DDR4 REF
0.6 V @ 0.01 A
No use
3.30 V
Power sequence
USB3.0
5 V @ 2 A
AQR105-B1 VA
2.1 V @ 0.5 A
LT3085
QSGMII
VDD25
2.5 V @ 1 A
DDR4VPP
2.5 V @ 0.2 A
LTC3568
LTM4644
1
2
3
1
2
1
3
3
2
2
1
LTM4649
2
1.0 V @ 10 A
Core VDD
DVDD/EVDD
3.3 V @ 4.5 A
1
TVDD
1.2 V @ 0.1 A
OVDD/LVDD
1.8 V @ 2 A
DDR4 G1VDD
1.2 V @ 2.5 A
X1VDD
1.35 V @ 0.1 A
1
3
1
Figure 3-1. Power supply block diagram
3.2
Power supply operation
The power supply operation involves the following two activities:
• Power ON
• Power sequencing
3.2.1
Power ON
The SW2 switch, which is on the rear panel enables the 12 V power supply for the board.
Power supply operation
QorIQ LS1043A Reference Design Board Reference Manual, Rev. 4, 11/2017
34 NXP Semiconductors