Copyright © 2016, Texas Instruments Incorporated

11

LM2672

www.ti.com

SNVS136L – SEPTEMBER 1998 – REVISED JUNE 2016

Product Folder Links: LM2672

Submit Documentation Feedback

Copyright © 1998–2016, Texas Instruments Incorporated

9 Detailed Description

9.1 Overview

The LM2672 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 1 A,

and highly efficient operation.

number of external components, which have been pre-determined from a variety of manufacturers. Using either

Refer to LM2670 SIMPLE SWITCHER® High Efficiency 3A Step-Down Voltage Regulator with Sync for additional

application information.

9.2 Functional Block Diagram

9.3 Feature Description

9.3.1 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 or 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).