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LM2671

SNVS008L – SEPTEMBER 1998 – REVISED JUNE 2016

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8 Detailed Description

8.1 Overview

The LM2671 provides all of the active functions required for a step-down (buck) switching regulator. The internal

power switch is a DMOS power MOSFET to provide power supply designs with high current capability, up to

0.5 A, and highly efficient operation.

number of external components, which have been predetermined from a variety of manufacturers. Using either

Also, see LM2670 SIMPLE SWITCHER® High Efficiency 3A Step-Down Voltage Regulator with Sync for

additional applications information.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Switch Output

This is the output of a power MOSFET switch connected directly to the input voltage. The switch provides energy

to an inductor, an output capacitor and the load circuitry under control of an internal pulse-width-modulator

(PWM). The PWM controller is internally clocked by a fixed 260-kHz oscillator. In a standard step-down

application the duty cycle (Time ON/Time OFF) of the power switch is proportional to the ratio of the power

ground by the voltage drop of the external Schottky diode (switch OFF).