UCC39811 Datasheet, PDF (1/4 Pages) Texas Instruments – Universal Serial Bus Hot Swap Power Controller

UCC39811
Universal Serial Bus Hot Swap Power Controller
PRELIMINARY
FEATURES
• Support Four 5V Peripherals and One
USB 3.3V Controller
• Separate Power Enables
• 650mA Current Limiting per Channel
• Separate Open Drain Fault Indicator
for Each Channel
• 3.3V Output for USB Controller
• Available in 20 Pin DIP
DESCRIPTION
The UCC39811 Hot Swap Power Controller is designed to provide a self
powered USB hub with a local 3.3V regulated voltage and four 5V regu-
lated voltages for USB ports. Each of the 5V output ports is individually
enabled for optimal port control. Each port also provides an overcurrent
fault signal indicating that the port has exceeded a 650mA 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 UCC39811 can be configured to provide USB port power from a
loosely regulated voltage such as a Filament voltage internal to a monitor.
Pre-regulation is provided by an internal linear regulator controller and
one external logic level N-channel MOSFET. The UCC39811 can also be
configured without using the pre-regulator stage by connecting the VREG
pins to a regulated 5.5V 2A source.
The UCC39811 comes in a 20-pin DIP package and is protected by inter-
nal over-temperature shutdown mechanism, which disables the outputs
should the internal junction temperature exceed 150°C.
APPLICATION AND BLOCK DIAGRAM
03/99
+
–
UP STREAM
PORT
D+ D–
USB HUB
CONTROLLER
VHUB
6
V33
5
VREF
8
VFIL
7
3.3V
REGULATOR
2.5V
REF
ENA
18
OCA
17
VDRIVE
VREG
16
20
VREG
12
CHARGE
PUMP
+5V REG
A
V5A
19
ENB
4
OCB
3
+5V REG
B
V5B
1
ENC
14
OCC
15
+5V REG
C
V5C
13
END
9
OCD
10
+5V REG
D
UCC39811 USB HUB POWER CONTROLLER
2
GND
V5D
11
UDG-98199-1