LM2675M-3.3 Description

Monolithic integrated DC-DC converter circuits constructed using an LMDMOS technology make up the LM2675 series of regulators. All of the active operations necessary for a step-down (buck) switching regulator, which can drive a 1-A to load current with excellent line and load regulation, are provided by these regulators. These devices come with 3.3 V, 5 V, 12 V fixed output voltages as well as an adjustable output version.

These regulators are easy to operate, need a minimal amount of external components, and have patented internal frequency adjustment and a fixed frequency oscillator.

Because the LM2675 series switches at 260 kHz, fewer filter components are possible than with switching regulators that operate at lower frequencies. The printed-circuit board's copper traces serve as the sole heat sink due to their extremely high efficiency (>90%).

LM2675M-3.3 Features

• ±1.5% Maximum Output Voltage Tolerance Over Line and Load Conditions

• Ensured 1-A Output Load Current

• Wide Input Voltage Range: 8 V to 40 V

• 260-kHz Fixed Frequency Internal Oscillator

• TTL Shutdown Capability, Low-Power Standby Mode

• Thermal Shutdown and Current Limit Protection

• Efficiency up to 96%

• Available in 8-Pin SOIC, PDIP, and 16-Pin WSON Package

• Requires only 5 External Components

• 3.3-V, 5-V, 12-V, and Adjustable Output Versions

• Adjustable Version Output Voltage Range: 1.21 V to 37 V

LM2675M-3.3 Applications

• Simple High Efficiency (>90%) Step-Down (Buck) Regulator

• Efficient Preregulator for Linear Regulators

• Positive-to-Negative Converter