UCC3831 Datasheet, PDF (1/4 Pages) Texas Instruments – Universal Serial Bus Power Controller

UCC3831
PRELIMINARY
Universal Serial Bus Power Controller
FEATURES
• Fully USB Compliant
• Support Four 5V Peripherals and
One USB 3.3V Controller
• Separate Power Enables
• 500mA Current Limiting per
Channel
• Separate Open Drain Fault
Indicator for Each Channel
• 3.3V Output for USB Controller
• Available in 28 Pin Wide Surface
Mount and DIP
DESCRIPTION
The UCC3831 Power Controller is designed to provide a self powered
USB hub with a local 3.3V regulated voltage and four 5V regulated volt-
ages for USB ports. Each of the 5V output ports is individually enabled
for optimal port control. Each port also provides an overcurrent fault sig-
nal indicating that the port has exceeded a 500mA current limit. The
3.3V linear regulator is used to power the local USB microcontroller.
This regulator is protected with a 100mA current limit and has a logic
level enable input.
The UCC3831 can be configured to provide USB port power from a
loosely regulated voltage such as a Filament voltage internal to a moni-
tor. Pre-regulation is provided by an internal linear regulator controller
and one external logic level N-channel MOSFET. The UCC3831 can
also be configured without using the pre-regulator stage by connecting
the VREG pins to a regulated 5.5V 2A source.
The UCC3831 comes in a 28-pin wide SOIC power package optimized
for power dissipation, and is protected by internal over-temperature
shutdown mechanism, which disables the outputs should the internal
junction temperature exceed 150°C.
APPLICATION AND BLOCK DIAGRAM
11/97
UDG-97101