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Revision 0.1
OMAP4460 Pandaboard ES
System Reference Manual
September 29, 2011
DOC-21054
2.8
2.8.1
Miscellaneous Power Circuitry
Input Power Circuitry
The input power circuitry may be found on sheet 2 of the board schematic. A block diagram of this
circuitry is shown in Figure 4 below. The Pandaboard ES may be run either with or without a DC wall
supply plugged into the input power jack at P3.
Without an external power supply plugged in, the 5Vdc input power is supplied from the mini-AB
USBOTG connector at J18. This supply is only capable of providing 500mA of output current (1A if
operating via a USB cable with a “Y” connection to the host), so board operations will be limited in this
mode (e.g. operations could be limited, depending on current requirements). The path of current flow in
this mode is designated below by the red arrow. The 5V from VBUS will be routed through the switch at
U21, to the TPS54320 switching power supply at U22, which provides a 3.7V “battery” voltage for the
TWL6030 and TWL6040 Companion ICs.
Figure 4 – Pandaboard ES Input Power Circuitry Block Diagram
Page 26 of 82
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