LM2677

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM2677 SNVS077J – MAY 2004 – REVISED JUNE 2016 LM2677 SIMPLE SWITCHER® High Efficiency 5-A Step-Down Voltage Regulator with Sync 1 Features 1 Efficiency up to 92% Simple and Easy to Design Using Off-the-Shelf External Components 100-mΩ DMOS Output Switch 3.3-V, 5-V, and 12-V Fixed Output and Adjustable (1.2 V to 37 V) Versions 50-μA Standby Current When Switched OFF ±2% Maximum Output Tolerance Over Full Line and Load Conditions Wide Input Voltage Range: 8 V to 40 V External Sync Clock Capability (280 kHz to 400 kHz) 260-kHz Fixed Frequency Internal Oscillator −40°C to 125°C Operating Junction Temperature Range 2 Applications Simple to Design, High Efficiency (> 90%) StepDown Switching Regulators Efficient System Preregulator for Linear Voltage Regulators Battery Chargers Communications and Radio Equipment Regulator With Synchronized Clock Frequency 3 Description The LM2677 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 5-A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low onresistance DMOS power switch. The series consists of fixed output voltages of 3.3-V, 5-V, and 12-V and an adjustable output version. The SIMPLE SWITCHER® concept provides for a complete design using ...