LFC789D25CDR屬于集成電路（IC）的線性穩(wěn)壓器。由美國(guó)德州儀器公司制造生產(chǎn)的LFC789D25CDR穩(wěn)壓器 - 線性穩(wěn)壓器控制器線性電壓調(diào)節(jié)是指使用與負(fù)載串聯(lián)的旁路元件（通常是雙極型或場(chǎng)效應(yīng)晶體管）以及對(duì)應(yīng)的驅(qū)動(dòng)控制電路，以在負(fù)載兩端產(chǎn)生恒定的標(biāo)稱電壓，負(fù)載通常對(duì)電路的電源電壓變化或負(fù)載電流不敏感。該系列中的產(chǎn)品提供與外部旁路元件配合使用所必需的控制功能，從而將其與集成線性穩(wěn)壓器區(qū)分開(kāi)來(lái)，后者將旁路元件與控制電路整合在單個(gè)器件封裝中。

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)

Adjustable Output Can Be Set Via an

External Reference Pin, Allowing for the

Creation of a Tracking Regulator

Great Design Flexibility With Minimal

External Components

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.