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
