UCC38531
11/97
APPLICATION AND BLOCK DIAGRAM
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 20 Pin DIP
Universal Serial Bus Power Controller
FEATURES
DESCRIPTION
PRELIMINARY
UDG-97165-1
The UCC38531 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.
The UCC38531 is configured by connecting the VREG to a regulated
5.5V 2A source.
The 20-pin DIP package is protected by internal over-temperature shut-
down mechanism, which disables the outputs should the internal junc-
tion temperature exceed 150C.
2
UCC38531
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
T
J
= 25C, I
LOAD
= 10mA
3.2
3.3
3.4
V
0mA to 100mA, 0C to 125C, 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
5V Regulator
V5A-D Voltage
T
J
= 25C, I
LOAD
= 250mA, V
REG
= 5.5V
4.85
5
5.15
V
0mA to 500mA, 0C to 125C
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
T
J
= 25C, VFIL = 6V, ENA-D = 5V, ENHUB = 5V
11
11.45
12
V
0C to 125C, VFIL = 6V
10.5
11.45
12
V
Output Impedance
9
15
k
Enable Inputs
ENA-D Inputs - Guaranteed Low
0.7
V
ENA-D Inputs - Guaranteed High
3
V
Overcurrent Signals
Active Sink Current
I
OCX
=100
m
A
140
500
mV
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, T
J
= 0C to 125C for the UCC38531. VFIL = 6.5V,
VHUB = 5V. T
A
= T
J
.
ABSOLUTE MAXIMUM RATINGS
VFIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9V
VCON Supply Votage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9V
Logic Inputs (ENA-D)
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 . . . . . . . . . . . . . . . . . . .
-
65C to +150C
Junction Temperature . . . . . . . . . . . . . . . . . . . 55C to +150C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300C
Unless otherwise indicated, voltages are reference to ground.
Pulsed is defined as a less than 10% duty cycle with a maximum
duration of 500
S. Currents are positive into, negative out of the
specified terminal. All voltages are with respect to ground. Con-
sult Packaging Section of Databook for thermal limitations and
considerations of packages.
CONNECTION DIAGRAM
OCA
ENA
VSA
V5D
VREG
VDRIVE
OCC
VC5
ENC
VREG
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OCB
GND
OCD
V5B
VREF
VFIL
END
ENB
V33
VHUB
DIP-20 (Top View)
N Package
3
UCC38531
PIN DESCRIPTIONS
UNITRODE CORPORATION
7 CONTINENTAL BLVD. MERRIMACK, NH 03054
TEL. (603) 424-2410 FAX (603) 424-3460
ENA-D: Separate enables pins for each of the four 5V
supplies.
GND: All voltages are measured with respect to this
pin. Bypass capacitors should be connected to GND as
close to this pin as possible.
OCA-D: Open drain overcurrent indicator. OCA-D can
be wire OR'ed by the user to create a single overcur-
rent indicator.
V5A-D: 5V regulated output with enable, 500mA (mini-
mum) current limit, and overcurrent indicator.
V33: 3.3V regulator output. Current limit is 100mA mini-
mum.
VDRIVE: Internal charge pump voltage is brought out
for external decoupling. Nominal voltage is between 11V
and 13V. No external loading permitting. Decouple with
at least 0.001
F capacitor.
VFIL: Bias supply for all four of the 5V regulators. VFIL
voltage must be between 6V and 9V.
VHUB: Supply for the 3.3V USB controller power supply
and bandgap reference.
VREF: Internal 2.5V reference is brought out for exter-
nal decoupling only. Decouple with 0.01
F capacitor.
VREG: Input supply for all four 5V regulators. 2 pins
supply up to a total of 2.5A to the four 5V bus voltages
(V5A, V5B, V5C, V5D). Can be tied directly to VFIL.
IMPORTANT NOTICE
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pertaining to warranty, patent infringement, and limitation of liability.
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accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
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DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL
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Copyright
1999, Texas Instruments Incorporated
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