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.
The LM2672 series is a monolithic LDMOS step‑down (buck) switching regulator that delivers up to 1 A load current with efficiencies exceeding 90 %. It operates from a wide input range (6.5 V to 40 V) and is offered in fixed 3.3 V, 5.0 V, 12 V, and an adjustable version. The device includes internal frequency compensation, a fixed‑frequency 260 kHz oscillator, external shutdown, soft‑start, and frequency‑synchronization features.
The datasheet provides detailed electrical characteristics, absolute‑maximum ratings, package options (SO‑8, DIP, 16‑lead LLP), layout guidelines, and a design procedure with example component selections. It also references design software (LM267X Made Simple) and application notes for further support.
| Switching Frequency | 260 kHz |
|---|---|
| Input Voltage Range | 6.5 V to 40 V |
| Maximum Output Current | 1 A |
| Efficiency | up to 96 % |
| Standby Quiescent Current (ON/OFF pin) | 50 µA |
| Fixed Output Voltages | 3.3 V, 5.0 V, 12 V |
| Adjustable Output Range | 1.21 V to 37 V |
The LM2672 operates at a fixed switching frequency of 260 kHz.
The device is rated for an operating input voltage from 6.5 V up to 40 V (absolute maximum 45 V).
The regulator can supply up to 1 A of continuous load current.