Version 1.0
Page 36
2.15.2 Voltage Regulators
The following block diagram contains the on-board power solution for the UltraZed-EG SOM.
PSINTFP/PSINTFP_DDR
PSINTLP
PSAUX/PSIO(0:2:3)/PSADC
VCCAUX/VCCAUX_IO/VCCADC
PSPLL
IRPS5401
MISC
VCCINT_IO/VCCBRAM
PSDDR4_504
PSDDR_PLL
0.85V
1.8V
1.8V
1.2V
1.2V
0.85V
Vref
1.8V
0.85V
0.85V
3.3V
DUAL LDO
2.5V
3.3V
1V
MISC SUPPLIES
SYSMON_VREF
3.3V
5V-12V
VIN
LDO
VIN
IRPS5401
VIN
LDO
VIN
A
B
C
D
LDO
A
B
C
D
LDO
TPS51200
DDR4_VREF
3.3V
VCCINT
DDR4_VTT
PSDDR4_504
TPS62173
5VREG
VIN
VIN
Figure 14
– On-Board Regulation Circuits
The POWER GOOD output of the +3.3V rail is used to ENABLE the DDR termination regulator and the
ADP223 regulator completing the power sequence. These two supplies are the last regulators to be brought
up.
The UltraZed-EG SOM provides a power good signal to the end-user carrier card to signal that the SOM
power sequencing has completed and the end-fuser carrier card is free to bring up the VCCO supplies. This
signal is called
SOM_PG_OUT
and is tied to JX2.Pin 41.
SOM_PG_OUT
on the Micro Headers serves to
gate the power supplies for Bank 501, Bank 26, Bank 64, Bank 65, Bank 66, MGTRAVCC, and MGTRAVTT
on the end-user carrier card.
NOTE: SOM_PG_OUT is provided by the power good output of the DDR termination regulator.
The table below shows the maximum output current for each regulator on the UltraZed-EG SOM. Also listed
in the table below are the supported power modes and whether or not the rail is to remain active during the
power mode that the UltraZed-EG SOM is being operated in.