This application note provides PCB layout design guidelines for the LTM80xx series μModule regulators, including input and output routing, power and ground connections, and component placement.
The document outlines a simplified four-step process for designing PCBs using the LTM8020, LTM8021, LTM8022, and LTM8023 pModule regulators. These high-level integration devices require only an input capacitor, output capacitor, and one or two resistors to function as step-down DC/DC regulators.
The guide details specific instructions for generating component footprints with appropriate pad sizes and solder mask expansions to meet IPC-2221 standards. It further explains optimal component placement strategies to minimize trace lengths and reduce switching noise by separating ground connections of input and output capacitors.
The document discusses the LTM8020, LTM8021, LTM8022, and LTM8023 pModule regulators.
To reduce coupling and minimize output noise, it is better to place the output capacitor so its GND connection is farther away from that of the input capacitor.