Description:

The LM2675 series regulators are monolithic integrated DC-DC converter circuits fabricated using LMDMOS process technology. These regulators provide all the active functions of a step-down (buck) switching regulator, capable of driving 1A load current with excellent line and load regulation. The devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version. These regulators require very few external components, are simple and easy to use, and feature patented internal frequency compensation and a fixed-frequency oscillator. The LM2675 series operates at a switching frequency of 260kHz, allowing the use of smaller filter components than those required by lower-frequency switching regulators. Due to their very high efficiency (> 90%), the heat dissipation requirements can be met solely by the copper traces on the printed circuit board (PCB).

Features:

Up to 96% efficiency

Available in 8-pin SOIC, PDIP, and 16-pin WSON packages

Requires only 5 external components

3.3V, 5V, 12V, and adjustable output versions

Adjustable output voltage range from 1.21V to 37V

±1.5% maximum output voltage tolerance over line and load conditions

Rated 1A output load current

Wide input voltage range from 8V to 40V

260kHz fixed-frequency internal oscillator

TTL shutdown function and low-power standby mode

Thermal shutdown and current limit protection

Create custom designs using the LM2675 with WEBENCH® Power Designer

Applications:

Simple and highly efficient (> 90%) step-down (buck) regulators

High-efficiency preregulators for linear regulators

Positive-to-negative converters