LMZ20501

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SNVS874C – AUGUST 2012 – REVISED APRIL 2015

8 Detailed Description

8.1 Overview

The LMZ20501 SIMPLE SWITCHER Nano Module is a voltage mode buck regulator with an integrated inductor.

Input voltage feed-forward is used to compensate for loop gain variation with input voltage. Two operating modes

allow the user to tailor the regulator to their specific requirements. In forced PWM mode, the regulator operates

as a full synchronous device with a 3 MHz (typ.) switching frequency and very low output voltage ripple. In AUTO

mode, the regulator moves into PFM when the load current drops below the mode change threshold (see

Application Curves). In PFM, the device regulates the output voltage between wider ripple limits than in PWM.

This results in much smaller supply current than in PWM, at light loads and high efficiency. A simplified block

diagram is shown in Functional Block Diagram.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Nano Scale Package

The LMZ20501 incorporates world class package technology to provide a 1 A power supply with a total volume

of feed-back resistors to set the output voltage and the input and output filter capacitors. Figure 7 and Figure 8

show the LMZ20501 package. The regulator die is embedded into a PCB substrate while the power inductor is

mounted on top. Vias and copper clad are used to make the connections to the die, inductor and the external

components. This package is MSL3 compliant.

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