LFC789D25 Datasheet, PDF (1/11 Pages) Texas Instruments – DUAL LINEAR FET CONTROLLER

LFC789D25
DUAL LINEAR FET CONTROLLER
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
SLLS565B − MARCH 2003 − REVISED SEPTEMBER 2004
D OR PW PACKAGE
(TOP VIEW)
DRV_V_ADJ 1
SEN_V_ADJ 2
V_REF 3
GND 4
8 V_CC
7 DRV_V₂₅
6 SEN_V₂₅
5 NC
NC − No internal connection
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 R_DS(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
0°C to 70°C
SOIC (D)
TSSOP (PW)
Tube of 75
Reel of 2500
Tube of 150
Reel of 2000
LFC789D25CD
LFC789D25CDR
LFC789D25CPW
LFC789D25CPWR
KADAC
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.
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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Copyright  2004, Texas Instruments Incorporated
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