National Semiconductor LM2672 Manuals

The LM2672 series of regulators are monolithic integrated circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load current with excellent line and load regulation. These devices are avail- able in fixed output voltages of 3.3V, 5.0V, 12V, and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation (Patent Nos. 5,382,918 and 5,514,947), fixed frequency oscillator, external shutdown, soft-start, and frequency synchronization. The LM2672 series operates at a switching frequency of 260 kHz, thus allowing smaller sized filter components than what would be needed with lower frequency switching regu- lators. Because of its very high efficiency (>90%), the cop- per traces on the printed circuit board are the only heat sinking needed. A family of standard inductors for use with the LM2672 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the datasheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies. Other features include a guaranteed ±1.5% tolerance on output voltage within specified input vo

The LM2672 series is a monolithic integrated circuit that serves as a high-efficiency 1A step-down voltage regulator. It offers excellent line and load regulation, and is available in fixed output voltages of 3.3V, 5.0V, 12V, as well as an adjustable output version. The LM2672 includes various features such as internal frequency compensation, fixed frequency oscillator, external shutdown, soft-start, and frequency synchronization. Operating at a switching frequency of 260 kHz, it allows for smaller sized filter components compared to lower frequency regulators. With its high efficiency (>90%), the LM2672 only requires copper traces on the PCB for heat sinking. The LM2672 is compatible with a range of standard inductors, diodes, and capacitors for simplified switch-mode power supply designs.