The diagrams of Figure 2-1 and Figure 2-2 show examples of the power supply and power man-
agement scheme in the self-powered mode and bus-powered mode using an integrated switch
with built-in overcurrent protection.
Figure 2-1. Bus-powered Hub
BUS_POWER
GND
U1
GND
VCC
AT43301
PWR
OVC
U2
CTL
FLG
IN
OUT
SWITCH
PORT_POWER
GND
PORT_POWER
GND
PORT_POWER
GND
PORT_POWER
GND
TO
DOWNSTREAM
DEVICES
Figure 2-2. Self-powered Hub
BUS_POWER
GND
PS5
POWER SUPPLY
5V OUT
GND
U1
GND
VCC
AT43301
PWR
OVC
U2
CTL
FLG
IN
OUT
SWITCH
PORT_POWER
GND
PORT_POWER
GND
PORT_POWER
GND
PORT_POWER
GND
TO
DOWNSTREAM
DEVICES
8 AT43301
1137J–USB–01/06