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 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 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 monitor. 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
UDG-97101
11/97
ABSOLUTE MAXIMUM RATINGS
VFIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9V VCON Supply Votage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9V Logic Inputs (ENA-D, ENHUB)
Maximum Forced Voltage . . . . . . . . . . . . . . . . . –0.3V to 7V Maximum Forced Current . . . . . . . . . . . . . . . . . . . . . . ±1mA
V33
Maximum Forced Voltage. . . . . . . . . . . . . . . . . . . . . . . . . 5V Maximum Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mA
V5A-D
Maximum Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9V Maximum Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 750mA Storage Temperature . . . . . . . . . . . . . . . . . . . −65°C to +150°C Junction Temperature. . . . . . . . . . . . . . . . . . . –55°C to +150°C Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
Unless otherwise indicated, voltages are reference to ground. Pulsed is defined as a less than 10% duty cycle with a maximum duration of 500μS. Currents are positive into, negative out of the specified terminal. All voltages are with respect to ground. Consult Packaging Section of Databook for thermal limitations and considerations of packages.
UCC3831
CONNECTION DIAGRAM
SOIC-28 (Top View)
DWP Package
* DWP package pin 28 serves as signal ground; pins 7, 8, 9, 20, 21, 22 serve as heatsink/ground.
ELECTRICAL CHARACTERISTICS Unless otherwise specified, TJ = 0°C to 125°C for the UCC3831. VFIL = 6.5V, VHUB = 5V. TA = TJ.
PARAMETER |
TEST CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
Input Supply Currents |
|
|
|
|
|
VHUB Supply Current |
No External Load on V33 |
|
1 |
3 |
mA |
VFIL Supply Current |
|
|
1 |
3 |
mA |
Reference |
|
|
|
|
|
VREF Voltage |
Over Temperature |
2.35 |
2.5 |
2.65 |
V |
Line Regulation |
VHUB = 4.5V to 9V |
|
3 |
10 |
mV |
3.3V Regulator |
|
|
|
|
|
V33 Voltage |
TJ = 25°C, I LOAD = 10mA |
3.2 |
3.3 |
3.4 |
V |
|
0mA to 100mA, 0°C to 125°C, VHUB = 4.5V to 9V |
3.165 |
3.3 |
3.435 |
V |
Short Circuit Current Limit |
VHUB = 6V, Output shorted to Ground |
100 |
120 |
150 |
mA |
Pre-Regulator |
|
|
|
|
|
VREG Voltage |
0A to 2A, 0°C to 125°C, VFIL = 6V to 9V |
5.25 |
5.5 |
5.7 |
V |
5V Regulator |
|
|
|
|
|
V5A-D Voltage |
TJ = 25°C, I LOAD = 250mA, VREG = 5.5V |
4.85 |
5 |
5.15 |
V |
|
0mA to 500mA, 0°C to 125°C |
4.8 |
5 |
5.2 |
V |
Short Circuit Current Limit |
VREG = 5.5V, Output Shorted to Ground |
500 |
600 |
750 |
mA |
Charge Pump |
|
|
|
|
|
Quiescent Output Voltage |
TJ = 25°C, VFIL = 6V, ENA-D = 5V, ENHUB = 5V |
11 |
11.45 |
12 |
V |
|
0°C to 125°C, VFIL = 6V |
10.5 |
11.45 |
12 |
V |
Output Impedance |
|
|
9 |
15 |
kΩ |
Enable Inputs |
|
|
|
|
|
ENA-D Inputs - Guaranteed Low |
|
|
|
0.7 |
V |
ENA-D Inputs - Guaranteed High |
|
3 |
|
|
V |
Enable Inputs (cont.) |
|
|
|
|
|
ENHUB Input - Guaranteed Low |
|
|
|
0.7 |
V |
2
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