RD-181 - LMZ10504 5.5V V_IN 4A I_OUT Simple Switcher® Module Reference Design Package

Design Description

The LMZ1050x SIMPLE SWITCHER power module is a complete, easy-to-use DC-DC solution capable of driving up to 3A, 4A, or 5A load with exceptional power conversion efficiency, output voltage accuracy, line and load regulation. The LMZ1050x is available in an innovative package that enhances thermal performance and allows for hand or machine soldering.

There are 2 designs presented in this Board support package. The Demonstration board is configured in a low cost, high volume manufacturing design. The Evaluation board design is designed for easy access to all of the circuits.

The Demonstration design is in 2 layers, components on both side. The small signal components using 0603 footprints are located on the reverse side.

The evaluation board is designed to demonstrate low conducted noise on the input and output lines. Four input capacitors (C_in1 - C_in4) and three output capacitors (C_o1 - C_o3) are populated for this purpose. All the input and output filter capacitors are not necessary to comply with radiation standards. A circuit example that passes radiated emissions standards (EN55022, class B) is also presented. Additionally, a capacitor is present to reduce the resonance of the input line produced by the inductance and resistance in the cables connecting the bench power supply to the evaluation board design and the input capacitors.

The design files for both of these designs are included in the design file.

•	RD-181 Reference Design
•	CAD Design Files (source schematic, board layout and gerber files)
•	Application Note 2022 LMZ10504 Evaluation Board Documentation

Additional Product Resources

LMZ10504 Evaluation Board

• Integrated on chip shielded inductor
• 2.5V output voltage (easy to change via 2 resistors)
• Flexible startup sequencing using external soft-start, tracking, and precision enable
• Protection against in-rush currents and faults such as input UVLO and output short-circuit
• -40°C to +125°C junction temperature operating range
• Single exposed pad and standard pinout for easy mounting and manufacturing
• Fully enabled for WEBENCH® Power Designer

Application Areas

• Point-of-load conversions from 3.3V and 5V rails
• Space constrained applications
• Extreme temperatures/no air flow environments
• Noise sensitive applications (i.e. transceiver, medical)

LMZ10504 Demonstration Board

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LMZ10504 Demonstration Board