RSM3205

Compact 3A Power Module for High-Performance Embedded Systems

The RSM3205 is a fully integrated 3A DC/DC power module that combines a high-efficiency synchronous buck converter with an integrated inductor in a compact 2.0mm × 2.5mm LGA package. Designed for applications requiring higher output current without increasing PCB area, it simplifies power supply design while delivering excellent efficiency, fast transient response, and reliable operation.

Supporting a 2.4V to 5.5V input voltage range and switching frequencies up to 4MHz, the module enables compact, high-density power solutions using smaller external capacitors and minimal external components. Automatic PFM/PWM operation maximizes efficiency across varying load conditions, while an optional Forced PWM mode provides consistent switching frequency for applications requiring low output ripple and predictable EMI performance.

Ideal for embedded processors, networking equipment, industrial electronics, optical modules, and portable computing devices, this highly integrated solution shortens development time while simplifying PCB layout and improving manufacturing consistency.

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Maximize Performance Without Increasing PCB Area

Delivering higher output current often requires larger inductors and more complex layouts. By integrating the converter and inductor into a single package, the module delivers up to 3A while maintaining an extremely compact footprint.

Integrated Inductor Simplifies Layout

The integrated inductor eliminates one of the largest external components found in traditional buck converter designs, reducing PCB area, simplifying routing, and improving layout consistency across production.

High-Frequency Operation

Operating at switching frequencies up to 4MHz, the module supports smaller external capacitors while maintaining excellent transient response and high efficiency, making it ideal for space-constrained electronic products.

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Flexible Power Conversion for Modern Electronics

The module combines efficient power conversion with flexible operating modes and simplified output voltage configuration.

Wide Input Voltage Range

Supporting a 2.4V to 5.5V input voltage range, the RSM3205 operates from USB power sources, regulated intermediate rails, and single-cell lithium-ion batteries.

Automatic or Forced PWM Operation

Designers can optimize performance for their application by selecting:

• Automatic PFM/PWM mode for maximum efficiency across a wide load range.
• Forced PWM mode for applications requiring constant switching frequency and reduced output ripple.

Factory-Trimmed Output Voltage Options

Multiple factory-programmed trim options simplify output voltage selection while minimizing the number of required external components.

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Integrated Features Improve System Reliability

Integrated monitoring and protection functions reduce external circuitry while improving overall system robustness.

Integrated System Functions

The module includes:

• Up to 3A continuous output current
• ±1% output voltage accuracy
• Power Good (PG) output
• Integrated output discharge

Built-In Protection

Integrated protection features include:

• Overcurrent protection (OCP)
• Short-circuit protection (SCP)

These features improve reliability while protecting both the module and downstream circuitry during fault conditions.

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Compact Integration for High-Density Designs

The compact 2.0mm × 2.5mm × 1.1mm LGA package combines the converter and inductor into a highly integrated solution that significantly reduces PCB area compared to conventional discrete implementations.

By minimizing component count and simplifying PCB layout, the module accelerates development while helping designers achieve compact, high-density power architectures.

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Part of the RSM3203/3204/3205 Power Module Family

The RSM3205 is the 3A member of Reed Semiconductor’s compact DC/DC power module family. All three devices share the same integrated architecture, package, operating modes, and protection features while offering different output current capabilities to simplify product scaling.

Using a common package and architecture allows designers to increase available output current with minimal PCB redesign, reducing development time, simplifying qualification, and streamlining inventory management.

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Explore Reed’s Integrated Power Modules

The RSM3205 is part of Reed Semiconductor’s family of integrated DC/DC power modules designed to simplify power supply development while maximizing power density. Reed also offers synchronous buck converters, PMBus™ digital regulators, multiphase controllers, Smart Power Stages, and Power Blocks, enabling designers to build complete power architectures for applications ranging from portable electronics and industrial automation to AI infrastructure and high-performance computing.