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LM2679
SNVS026O – MARCH 2000 –...
Product Folder
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LM2679
SNVS026O – MARCH 2000 – REVISED JUNE 2016
LM2679 SIMPLE SWITCHER® 5-A Step-Down
Voltage Regulator With Adjustable Current Limit
1 Features
1 Efficiency Up to 92% Simple and Easy to Design Using Off-The-Shelf
External Components Resistor Programmable Peak Current Limit Over a
Range of 3 A to 7 A 120-mΩ DMOS Output Switch 3.3-V, 5-V, 12-V Fixed Output and Adjustable
(1.2 V to 37 V) Versions ±2% Maximum Output Tolerance Over Full Line
and Load Conditions Wide Input
Voltage Range: 8 V to 40 V 260-kHz Fixed Frequency Internal Oscillator Soft-Start Capability −40 to 125°C Operating Junction Temperature
Range
2 Applications
Simple-to-Design, High Efficiency (>90%) Step-Down Switching Regulators
Efficient System Preregulator for Linear
Voltage Regulators
Battery Chargers
3 Description
The LM2679 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 a minimum number of external components. A high fixed frequency oscillator (260 kHz...
