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 UCC3831 ABSOLUTE MAXIMUM RATINGS CONNECTION DIAGRAM 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. 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 VFIL Supply Current 1 3 mA 1 3 mA 2.5 2.65 V 3 10 mV Reference VREF Voltage Over Temperature Line Regulation VHUB = 4.5V to 9V 2.35 3.3V Regulator V33 Voltage TJ = 25°C, ILOAD = 10mA 3.2 3.3 3.4 V 3.165 3.3 3.435 V VHUB = 6V, Output shorted to Ground 100 120 150 mA 0A to 2A, 0°C to 125°C, VFIL = 6V to 9V 5.25 5.5 5.7 V 0mA to 100mA, 0°C to 125°C, VHUB = 4.5V to 9V Short Circuit Current Limit Pre-Regulator VREG Voltage 5V Regulator V5A-D Voltage Short Circuit Current Limit TJ = 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 VREG = 5.5V, Output Shorted to Ground 500 600 750 mA 11 11.45 12 V 10.5 11.45 12 V 9 15 kΩ 0.7 V Charge Pump Quiescent Output Voltage TJ = 25°C, VFIL = 6V, ENA-D = 5V, ENHUB = 5V 0°C to 125°C, VFIL = 6V Output Impedance Enable Inputs ENA-D Inputs - Guaranteed Low ENA-D Inputs - Guaranteed High 3 V Enable Inputs (cont.) ENHUB Input - Guaranteed Low 0.7 2 V UCC3831 ELECTRICAL CHARACTERISTICS Unless otherwise specified, TJ = 0°C to 125°C for the UCC3831. VFIL = 6.5V, VHUB = 5V. TA = TJ. PARAMETER TEST CONDITIONS ENHUB Input - Guaranteed High MIN TYP MAX UNITS 3 V Overcurrent Signals Active Sink Current IOCX =100mA 140 500 mV PIN DESCRIPTIONS ENA-D: Separate enables pins for each of the four 5V supplies. V33: 3.3V regulator output. Enable when ENHUB is high. Current limit is 100mA minimum. ENHUB: Enables the 3.3V output V33. Pulling this pin low disables V33. 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. GATE: Gate drive for an external NMOS used to regulate the 5.5V VREG supply. Minimum available drive is 11V. VFIL: Bias supply for all four of the 5V regulators. VFIL voltage must be between 6V and 9V. GND: All 6 GND pins must be tied to the system ground. In addition to serving as electrical conductors, these 6 pins are heat sinks. Refer to the Packaging Device Temperature Management guide in the Packaging section of the Unitrode Databook. 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. OCA-D: Open drain overcurrent indicator. OCA-D can be wire OR'ed by the user to create a single overcurrent indicator. VREG: Regulated to 5.5V by means of an external NMOS. 2 pins supply up to a total of 2.5A to the four 5V bus voltages (V5A, V5B, V5C, V5D). V5A-D: 5V regulated output with enable, 500mA (minimum) current limit, and overcurrent indicator. UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. 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