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LFC789D25CDR Datasheet(PDF) 1 Page - Texas Instruments |
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LFC789D25CDR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 11 page LFC789D25 DUAL LINEAR FET CONTROLLER SLLS565B − MARCH 2003 − REVISED SEPTEMBER 2004 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Two Independent Controllers for Regulation of: − Fixed 2.5-V and an Adjustable Output − ±2% (Max) Regulation Across Temperature and Load (1 mA to 3 A) D Adjustable Output Can Be Set Via an External Reference Pin, Allowing for the Creation of a Tracking Regulator D Great Design Flexibility With Minimal External Components D Applications: High-Current, Low-Dropout Regulators for: − DDR/RDRAM Memory Termination − Motherboards − Chipset I/O − GTLP Termination description/ordering information The LFC789D25 is a dual linear FET controller that simplifies the design of dual power supplies. The device consists of two independent controllers, each of which drives an external MOSFET to implement a low-dropout regulator. One controller is programmed to regulate a fixed 2.5-V output, while the second controller can be programmed to regulate any desired output voltage via a reference input pin, allowing for the creation of a tracking regulator often needed for termination schemes. And, because heating effects of the external FETs easily can be isolated from the controllers, the controllers can regulate the output voltages to a maximum tolerance of ±2% across temperature and load. The LFC789D25 allows designers a great deal of flexibility in selecting external components and topology to implement their specific power-supply needs. With appropriate heat sinking, the designer can build a regulator with as much current capability as allowed by the external MOSFET and power supply. And, because the dropout of the regulator simply is the product of the RDS(on) of the external power MOSFET and the load current, very low dropout can be achieved via proper selection of the power MOSFET. Packaged in 8-pin SOIC and space-saving TSSOP, the LFC789D25 is characterized for operation from 0 °C to 70 °C. ORDERING INFORMATION TA PACKAGE† ORDERABLE PART NUMBER TOP-SIDE MARKING SOIC (D) Tube of 75 LFC789D25CD KADAC 0 °C to 70°C SOIC (D) Reel of 2500 LFC789D25CDR KADAC 0 °C to 70°C TSSOP (PW) Tube of 150 LFC789D25CPW KADAC TSSOP (PW) Reel of 2000 LFC789D25CPWR KADAC † Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. 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. Copyright 2004, Texas Instruments Incorporated 1 2 3 4 8 7 6 5 DRV_VADJ SEN_VADJ VREF GND VCC DRV_V25 SEN_V25 NC D OR PW PACKAGE (TOP VIEW) NC − No internal connection 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. |
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