High Efficiency, Synchronous, Step-down Buck Controllers

The UC3874 family of synchronous Step-down (Buck) Regulators provides high efficiency power conversion from an input voltage range of 4.5 to 36 volts. The UC3874 is tailored for battery powered applications such as laptop computers, consumer products, Communications systems, and aerospace which demand high performance and long battery life. The synchronous Regulator replaces the catch Diode in the standard buck Regulator with a low Rds(on) N-Channel MOSFET Switch allowing for significant efficiency improvements. The high side N-Channel MOSFET Switch is driven out of phase from the low side N-Channel MOSFET Switch by an on-chip bootstrap circuit which requires only a single external capacitor to develop the regulated Gate drive. Fixed frequency, average current mode control provides the Regulator with inherent slope compensation, tight regulation of the output voltage, and superior load and line transient response. Switching frequencies up to 300kHz are possible. Light load efficiency is improved by a fully programmable standby mode, in which the quiescent current consumption of the controller is significantly re- duced. The reduction is achieved by disabling the MOSFET driver outputs and the internal Oscillator when the controller has sensed that the the out- put load current has dropped a user programmable amount from full load. By Texas Instruments
UC1874-1 's PackagesUC1874-1 's pdf datasheet

UC1874-1 Pinout, Pinouts
UC1874-1 pinout,Pin out
This is one package pinout of UC1874-1,If you need more pinouts please download UC1874-1's pdf datasheet.

UC1874-1 Application circuits
UC1874-1 circuits
This is one application circuit of UC1874-1,If you need more circuits,please download UC1874-1's pdf datasheet.

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