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LM2678
SNVS029K – MARCH 2000 – RE...
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LM2678
SNVS029K – MARCH 2000 – REVISED FEBRUARY 2017
LM2678 SIMPLE SWITCHER® High Efficiency 5-A Step-Down
Voltage Regulator
1 Features
1 Efficiency Up to 92% Simple and Easy to Design Using Off-the-Shelf
External Components 120-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 260-kHz Fixed Frequency Internal Oscillator −40 to 125°C Operating Junction Temperature
Range Create a Custom Design Using the LM2678 With
the WEBENCH® Power Designer
2 Applications
Simple-to-Design, High Efficiency (>90%) StepDown Switching Regulators
Efficient System Preregulator for Linear
Voltage Regulators
Battery Chargers
3 Description
The LM2678 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 oscill...