Table 4. LS1046ARDB power supply devices
Reference
designator
Device
Power supply
voltage
Description
(From 12 V power
adapter)
+12V (12 V at ~8 A)
Supply for LTC3866, LT8640, and LT8612 power
supply devices
U518
LTC3866 (Linear
Technology)
+CPU_VDD (1 V at
16 A)
• Supply for processor cores and platform (VDD)
• Filtered VDD also powers USB (USB_SVDD and
USB_SDVDD) power supplies of the LS1046A
processor
• Filtered VDD can also be used to power SerDes
(SVDD) power supply of the LS1046A processor
• Jumper-enabled VDD also powers TA_BB_VDD
and FA_VL supplies of the LS1046A processor
U519
LTC3866 (Linear
Technology)
+3_3V (3.3 V at 8 A)
• Supply for processor DVDD and EVDD
• Filtered 3.3 V power for USB (USB_HVDD)
power supply of the LS1046A processor
• Supply for RGMII and SGMII PHYs,CPLD, SD
card slot, mini-PCIe and PCIe slots, and muxes
• Supply for MC34VR500V8ES, MC34716EP,
LT3085, and LT3065 (U13) power supply devices
U523
LT8640 (Linear
Technology)
+5_0V (5 V at 2 A)
Supply for SATA connector and USB Type A and
Micro-AB connectors
U511
LT8612 (Linear
Technology)
+VPA:
• 5 V at 2.2 A
• 4.5 V at 2 A
• 3.5 V at 1.6 A
• 3.3 V at 1.6 A
Supply for Wi-Fi card on mini-PCIe slot
U520
MC34VR500V8ES (NXP
Semiconductors)
SW1LX: 0V85 (0.85 V
at 4.5 A)
Supply for AQR107 PHY VDD and VDD_SRDS
SW2LX: +1_35V (1.35
V at 2 A)
Supply for processor XVDD
SW3LX: +1_8V (1.8 V
at 2.5 A)
• Supply for processor OVDD, LVDD, and TH_VDD
• Supply for processor AVDD_CGA[1:2],
AVDD_PLAT, and AVDD_D1
• Supply for CPLD, eMMC, and JTAG and 1588
headers
• Supply for LT3065 (U12) power supply device
SW4LX: +SVDD
(1/0.9 V at 1 A)
Filtered supply for processor SVDD
Table continues on the next page...
LS1046ARDB Functional Description
QorIQ LS1046A Reference Design Board Reference Manual, Rev. 2, 30 May 2019
18
NXP Semiconductors