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 are monolithic step‑down (buck) regulators that deliver up to 1 A load current with excellent line and load regulation. They operate at a fixed 260 kHz switching frequency, provide over 90 % efficiency, and require only five external components.
The device is offered in SO‑8, 8‑pin DIP and 16‑lead LLP packages, with fixed output versions of 3.3 V, 5.0 V and 12 V as well as an adjustable version. Typical applications include high‑efficiency step‑down converters and pre‑regulators for linear regulators.
| Switching frequency | 260 kHz |
|---|---|
| Maximum efficiency | up to 96 % |
| Input voltage range | 8 V to 40 V |
| Output current | 1 A |
| Fixed output voltages | 3.3 V, 5.0 V, 12 V, adjustable |
| Quiescent current (typical) | 2.5 mA |
The LM2672 operates at a fixed switching frequency of 260 kHz.
The device can achieve up to 96 % efficiency.
Only five external components are needed.
It is offered in SO‑8, 8‑pin DIP and 16‑lead LLP packages.