LM2671 Datasheet PDF

●The LM2671 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, fixed frequency oscillator, external shutdown, soft start, and frequency synchronization.

●The LM2671 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.

●A family of standard inductors for use with the LM2671 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the data sheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies.

●Other features include a ensured ±1.5% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring typically 50-µA standby current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.

● Efficiency up to 96%

● Available in 8-Pin SOIC, PDIP, and WSON

●Packages

● Simple and Easy to Design With

● Requires Only 5 External Components

● Uses Readily Available Standard Inductors

● 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 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

● Soft-Start and Frequency Synchronization

● Thermal Shutdown and Current-Limit Protection