LM2674MX-3.3/NOPB

LM2674 SIMPLE SWITCHER®电源转换器高效率500毫安降压型稳压器 LM2674 SIMPLE SWITCHER® Power Converter High Efficiency 500 mA Step-Down Voltage Regulator

Description

The LM2674 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 500-mA 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 LM2674 series operates at a switching frequency of 260 kHz, thus allowing smaller sized filter components than what is required 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 required.

Features

• Efficiency up to 96%

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

• Simple and Easy to Design With

• Requires Only 5 External Components

• Uses Readily Available Standard Inductors

• 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 500-mA Output Load Current

• 0.25-Ω DMOS Output Switch

• 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

Applications

• Simple High Efficiency >90% Step-Down Buck Regulators

• Efficient Preregulator for Linear Regulators

• Positive-to-Negative Converters