LM2675MX-3.3/NOPB Power Regulator IC Switching Voltage Regulators Pwr Cnvtr Hi Eff 1A SD Vtg Reg

LM2675MX-3.3/NOPB Power Regulator IC Switching Voltage Regulators Pwr Cnvtr Hi Eff 1A SD Vtg Reg

1 Features

• 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

• ±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

2 Applications

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

• Efficient Preregulator for Linear Regulators

• Positive-to-Negative Converter

3 Description

The LM2675 series of regulators are monolithic integrated DC-DC converter circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1-A load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation 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.

Device Information