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 is simply 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.

• 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

• Output options
• Dual Output, Fixed Output
• Iout (Max) (A)
• 3
• Vin (Max) (V)
• 16
• Vin (Min) (V)
• 9
• Vout (Max) (V)
• 2.5
• Vout (Min) (V)
• 2.5
• Fixed output options (V)
• 2.5
• Iq (Typ) (mA)
• 2
• Thermal resistance θJA (°C/W)
• 97
• Rating
• Catalog
• Load capacitance (Min) (μF)
• 0
• Regulated outputs (#)
• 2
• Features
• —
• Accuracy (%)
• 2
• Operating temperature range (C)
• 0 to 70

LFC789D25的完整型号有：LFC789D25CDR，以下是这些产品的关键参数及官网采购报价：

LFC789D25CDR，工作温度：0 to 70，封装：SOIC (D)-8，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网LFC789D25CDR的批量USD价格：.33（1000+）

LFC789D25CDR，工作温度：0 to 70，封装：SOIC (D)-8，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网LFC789D25CDR的批量USD价格：.33（1000+）