Table 2-3. Secondary power supplies (continued)
Part
identifier
Manufacturing
part number
Part
manufacturer
Power
supply
Specifications Description
OVDD is the
source of the 1.8
V power.
U29 LTC7150 Linear
Technology
0V85 0.85 V at 20 A with ±3%
accuracy
Supplies power to the
Aquantia AQR107 PHYs,
Inphi IN112525 PHY, and
DDR memories
U30 MC34717EP/R2 NXP
Semiconductors
1V2 1.2 V at 5 A with ±3%
accuracy
Supplies power to the
Aquantia AQR107 PHYs
and Inphi IN112525 PHY
0V9 0.9 V at 5 A with ±3%
accuracy
Supplies power to the
Inphi CS4223 PHY
U31 MC34717EP/R2 NXP
Semiconductors
2V5 2.5 V at 5 A with ±3%
accuracy
Supplies power to DDR4
DIMM connectors
2V1 2.1 V at 5 A with ±3%
accuracy
Supplies power to the
Aquantia AQR107 PHYs
U3 MC34717EP/R2 NXP
Semiconductors
3V3_SB 3.3 V at 1.5 A Standby (“hot”) power for
the CPLD core
1V8_SB 1.8 V at 1.5 A Standby (“hot”) power for
the CPLD core and I/O
U27 MAX8902B Maxim Integrated TA_BB_VDD 0.8 V at 0.5 A Supplies power to the
LX2160A secure monitor
2.1.3 Power supply sequence
The external ATX power supply provides 5V_SB voltage when connected to an AC
power outlet. This is an independent 5V power supply that is always active. This voltage
is used to generate the 3V3_SB and 1V8_SB standby power supplies, which are used to
power the CPLD.
With power available, CPLD can manage the orderly power-up of the rest of the system
on an appropriate event (one of the following):
•
The power switch (push button) is pressed
• The SW_AUTO_ON switch (SW4[2]) is set to '1'
On receipt of a power event signal, the CPLD power sequencer block manages the
orderly enable of the remaining power supplies, as shown in the figure below.
Chapter 2 LX2160ARDB Functional Description
QorIQ LX2160A Reference Design Board Reference Manual, Rev. 0, 09/2018
NXP Semiconductors 23
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