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LM2670
SNVS036K – APRIL 2000 –...
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LM2670
SNVS036K – APRIL 2000 – REVISED JUNE 2016
LM2670 SIMPLE SWITCHER® High Efficiency 3-A Step-Down Voltage
Regulator With Sync
1 Features
1 Efficiency Up to 94% Simple and Easy to Design With (Using Off-the-
Shelf External Components) 150-mΩ DMOS Output Switch 3.3-V, 5-V, 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 to 125°C Operating Junction Temperature
Range
2 Applications
Simple-to-Design, High Efficiency (>90%) StepDown Switching
Regulators
Efficient System Pre
regulator for Linear Voltage
Regulators
Battery Chargers Communications and Radio Equipment
Regulator
With Synchronized Clock Frequency
3 Description
The LM2670 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 3-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 output version.
The SIMPLE SWITCHER® concept provides for a complete design using a minimum numbe...