RSM3203

The RSM3203 is a fully integrated 1A 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 space-constrained applications, it simplifies power supply design by minimizing external components while delivering excellent efficiency and fast transient response.

Operating from a 2.4V to 5.5V input voltage range, the module supports switching frequencies up to 4MHz, enabling the use of smaller external capacitors and reducing overall solution size. Automatic PFM/PWM operation maximizes efficiency across varying load conditions, while an optional Forced PWM mode provides predictable switching behavior for noise-sensitive applications.

Ideal for portable electronics, optical modules, IoT devices, and industrial embedded systems, this highly integrated solution reduces PCB area, shortens development time, and simplifies PCB layout.

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Simplify Power Supply Design

Integrating the power stage and inductor into a single package eliminates one of the largest external components in a traditional buck converter design. The result is a smaller solution footprint, simplified PCB layout, and improved design consistency.

Integrated Inductor Reduces PCB Area

Unlike discrete buck converter solutions, the module integrates both the converter and inductor into a compact package, reducing component count and simplifying placement and routing.

High-Density Power Solution

With switching frequencies up to 4MHz, designers can use smaller external capacitors while maintaining excellent transient response and high efficiency, making the module ideal for compact electronic products.

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Flexible Performance Across a Wide Range of Applications

Designed for battery-powered and regulated power rails, the module combines flexible operating modes with configurable output voltage options.

Wide Input Voltage Range

Supporting 2.4V to 5.5V input voltages, the module is compatible with USB-powered devices, single-cell lithium-ion batteries, and regulated intermediate power rails.

Automatic or Forced PWM Operation

Designers can select the operating mode that best fits their application:

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

Factory-Trimmed Output Voltage Options

Multiple trim options simplify design while minimizing the number of external components required for output voltage configuration.

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Integrated Features Improve System Reliability

Built-in monitoring and protection functions simplify implementation while helping protect the power supply and downstream circuitry.

Integrated System Functions

The module includes:

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

Built-In Protection

Integrated protection features include:

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

These protections improve system robustness while reducing the need for external supervisory circuitry.

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Compact Integration for Modern Electronics

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

By minimizing component count and simplifying layout, the module helps accelerate development while improving manufacturing consistency.

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Part of the RSM3203/3204/3205 Power Module Family

The RSM3203 is the 1A member of Reed Semiconductor’s compact DC/DC power module family. All three devices share the same compact footprint, integrated inductor, high-frequency operation, and protection features while offering different output current capabilities.

Using a common package and architecture allows designers to scale output current with minimal PCB redesign, simplifying product development and inventory management.

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Explore Reed’s Integrated Power Modules

The RSM3203 is part of Reed Semiconductor’s growing family of integrated DC/DC power modules designed to simplify power supply development while maximizing power density. Reed also offers higher-current power modules, synchronous buck converters, PMBus™ digital regulators, multiphase controllers, Smart Power Stages, and Power Blocks, providing complete power solutions for applications ranging from portable electronics and industrial automation to AI infrastructure and high-performance computing.