Datasheet

EN IN
OC
OUT
D +
D -
5 V
GND
D +
D -
5 V
D +
D -
5 V
D +
D -
5 V
Downstream
Ports
A
B
C
D
A
B
C
D
GND
GND
GND
1 µF
Ferrite Beads
Ferrite Beads
Ferrite Beads
Ferrite Beads
3.3 V
OUT
OUT
IN
15 kΩ
15 kΩ
15 kΩ
15 kΩ
1.5 kΩ
15 kΩ
15 kΩ
15 kΩ
15 kΩ
SN75240
A
D
SN75240
A
3.3 V LDO
A
100 µF
B
100 µF
B
100 µF
B
100 µF
B
SN75240
A
TPS2041
A
NOTES: A.
B.
C. LDO is a 5-V-to-3.3-V voltage regulator
D. All USB DP, DM signal pairs require series resistors of approximately 27
TPS2041 and SN75240 are Texas Instruments devices. The outputs of the TPS204n are open drain. A 10-k pullup is
recommended.
120 µF per hub is the minimum required per the USB specification. However, TI recommends a 100-µF, low ESR,
tantalum capacitor per port for immunity to voltage droop.
OCn Ω
Ω to ensure proper termination. An optional filter
capacitor of about 22 pF is recommended for EMI suppression. This capacitor, if used, must be placed between the hub
terminal and the series resistor, as per section 7.1.6 of the USB specification.
TUSB2046B
TUSB2046BI
SLLS413I –FEBRUARY 2000 –REVISED SEPTEMBER 2013 www.ti.com
Bus-Powered Hub, Ganged-Port Power Management
When used in bus-powered mode, the TUSB2046B supports up to four downstream ports by controlling a
TPS2041 device which is capable of supplying 100 mA of current to each downstream port. Bus-powered hubs
must implement power switching to ensure current demand is held below 100 mA when the hub is hot-plugged
into the system. Utilizing the TPS2041 for ganged-port power management provides overcurrent protection for
the downstream ports. The SN75240 transient suppressors reduce inrush current and voltage spikes on the data
lines. The OVRCUR signals must be tied together for a ganged operation.
Figure 11. TUSB2046B Bus-Powered Hub, Ganged-Port Power-Management Application
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