Datasheet UCC38531N Datasheet (Texas Instruments)

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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 voltages for USB ports. Each of the 5V output ports is individually enabled for optimal por t 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.

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 junction temperature exceed 150°C.

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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 13mA

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 = 25°C, ILOAD = 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

5V Regulator

V5A-D Voltage T

J = 25°C, ILOAD = 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 T

J = 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 915kΩ

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

A 140 500 mV

ELECTRICAL CHARACTERISTICS Unless otherwise specified, TJ = 0°C to 125°C for the UCC38531. VFIL = 6.5V,

VHUB = 5V. TA =TJ.

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 ...................−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 500

S.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.

CONNECTION DIAGRAM

OCA

ENA

VSA

V5D

VREG

VDRIVE

OCC

VC5

ENC

VREG

OCB

GND

OCD

V5B

VREF

VFIL

END

ENB

V33

VHUB

DIP-20 (Top View) N Package

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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 overcurrent indicator.

V5A-D: 5V regulated output with enable, 500mA (minimum) current limit, and overcurrent indicator.

V33: 3.3V regulator output. Current limit is 100mA minimum.

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 0.001µF 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 external decoupling only. Decouple with 0.01µF 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.

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