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UCC2912DPRG4 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC2912DPRG4 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 16 page UCC2912 UCC3912 PROGRAMMABLE HOT SWAP POWER MANAGER SLUS241D − MARCH 1994 - REVISED NOVEMBER 2003 1 www.ti.com D Integrated 0.15-Ω Power MOSFET D 3-V to 8-V Operation D Digital Programmable Current Limit from 0 A to 3 A D Electronic Circuit Breaker Function D 1µA ICC When Disabled D Programmable On-Time D Programmable Start Delay D Fixed 3% Duty Cycle D Unidirectional Switch D Thermal Shutdown D Fault-Output Indicator D Maximum-Output Current Can Be Set to 1 A Above the Programmed Fault Level or to a Full 4 A D Power SOIC, Low-Thermal Resistance Packaging description The UCC3912 family of hot swap power managers provides complete power management, hot swap capability, and circuit breaker functions. The only component required to operate the device, other than supply bypassing, is the fault timing capacitor, CT. All control and housekeeping functions are integrated, and externally programmable. These include the fault current level, maximum output-sourcing current, maximum fault time, and startup delay. In the event of a constant fault, the internal fixed 3% duty cycle ratio limits average output power. The internal 4-bit DAC allows programming of the fault level current from 0 A to 3 A with 0.25-A resolution. The IMAX control pin sets the maximum sourcing current to 1 A above the fault level when driven low, and to a full 4 A when driven high for applications which require fast output capacitor charging. When the output current is below the fault level, the output MOSFET is switched on with a nominal on resistance of 0.15 Ω. When the output current exceeds the fault level, but is less than the maximum sourcing level, the output remains switched on, but the fault timer starts charging CT. Once CT charges to a preset threshold, the switch is turned off, and remains off for 30 times the programmed fault time. When the output current reaches the maximum sourcing level, the MOSFET transitions from a switch to a constant current source. (continued) block diagram UDG-99146 B1 B0 6 7 8 2 3 9 11 16 0 A−3 A 0.25 RES B3 B2 5 4 13 12 CT ON TIME CONTROL 3% DUTY CYCLE + − THERMAL SHUTDOWN INTERNAL BIAS + − 1 SHTDWN 14 15 1.5 V H = OPEN FAULT CURRENT SENSE + − CHARGE PUMP 30 mV VOUT REVERSE VOLTAGE COMPARATOR + − LINEAR CURRENT AMPLIFIER 1 A ABOVE FAULT 10 IMAX GND HEATSINK GND PINS CURRENT FAULT LEVEL 0A TO 3 A OVERCURRENT COMPARATOR MAX CURRENT LEVEL 4 A H = 4 A VIN VIN VOUT VOUT POWER FET 4 BIT DAC Copyright 2003, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. |
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