The LM2675 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 available 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) and a fixed frequency oscillator. The LM2675 series operates at a switching frequency of 260 kHz, thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Because of its very high efficiency (>90%), the copper traces on the printed circuit board are the only heat sinking needed. A family of standard inductors for use with the LM2675 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 voltages and output load conditions, and ±10% on the oscillator frequency.
The LM2675 series are monolithic step‑down (buck) switching regulators that deliver up to 1 A load current with efficiencies up to 96 %. They operate from a wide input voltage range of 8 V to 40 V and use a fixed 260 kHz internal oscillator, allowing small filter components and minimal heat‑sinking.
The device is offered in fixed output versions (3.3 V, 5 V, 12 V) and an adjustable version (1.21 V to 37 V). It is available in SO‑8, 8‑pin DIP and LLP packages, with detailed ordering information and package markings provided. The datasheet includes absolute maximum ratings, electrical characteristics, typical performance curves, and physical dimensions.
| Efficiency | up to 96 % |
|---|---|
| Switching Frequency | 260 kHz |
| Maximum Output Current | 1 A |
| Input Voltage Range | 8 V to 40 V |
| Available Packages | SO‑8, 8‑pin DIP, LLP |
| Quiescent Current (typical) | 2.5 mA |
The LM2675 operates at a fixed switching frequency of 260 kHz.
The regulator can deliver up to 1 A of output current.
It accepts an input voltage from 8 V up to 40 V.
The device is offered in SO‑8, 8‑pin DIP, and LLP surface‑mount packages.