V

(3.3)

PU

SPEED

SOFTCON

RCV

VPO/VO

VP

VM

1.65 V to 3.6 V

System ASIC

D–

D+

1.5 kW

V

BUS

V

CC(5.0)

OE

V

reg(3.3)

SUSPND

VMO/FSE0

V

CC(I/O)

0.1 µF

0.1 µF

0.1 µF

V

CC

33 W

33 W

TUSB1106-Q1

GND

GND

GND

GND

GND

TUSB1106-Q1

SCAS916

– AUGUST 2011

www.ti.com

Figure 11. Peripheral-Side (Low-Speed) Internal Regulator Mode

Peripheral-Side (Low-Speed) Internal Regulator Mode

The USB side of the TUSB1106-Q1 can be powered from the VBUS line directly if a 3.3-V supply is not present on

board. In this case, the internal regulator can be used to provide the 3.3-V supply for the USB signaling. The

VCC(5.0) is connected to the VBUS, which receives 5-V supply from the host, and generates the 3.3-V output at the

Vreg(3.3) pin. In this mode, it is important that both VCC(5.0) and Vreg(3.3) pins have individual bypass capacitors in

the range of 0.1

μF. Powering VCC(5.0) through the VBUS port of the USB connector realizes significant power

saving for portable applications, such as cell phones, PDAs, etc. In this operating mode, the ICC(5.0) current is fed

from the host side. The USB-side power consumption, ICC(5.0) is 4 mA (with the regulator active), as opposed to

logic-side ICC(IO) of 1 mA under full-speed operation. While operating at low speed, the 1.5-kΩ resistor must be

connected between the D

– line and the VPU(3.3) or an external 3.3-V supply.

16

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© 2011, Texas Instruments Incorporated

Product Folder Link(s): TUSB1106-Q1