RSM3204 - Compact 2A CoolModule\™

Compact 2A CoolModule™ for High-Density Embedded Designs

The RSM3204 CoolModule™ is a fully integrated 2A DC/DC power module that combines a high-efficiency synchronous buck converter and inductor in a compact 2.0mm × 2.5mm × 1.1mm LGA package. Designed for space-constrained applications, the integrated-inductor architecture minimizes external components, simplifies PCB layout, and delivers efficient, high-density point-of-load power.

Supporting a 2.4V to 5.5V input voltage range and switching frequencies up to 4MHz, the module enables compact power solutions with smaller external components and reduced PCB area. Automatic PFM/PWM operation provides high efficiency across varying load conditions, while Forced PWM operation provides predictable switching behavior for noise-sensitive applications.

Ideal for portable electronics, optical modules, industrial IoT, and embedded systems, the RSM3204 CoolModule™ combines compact integration, flexible operation, and built-in protection to simplify power supply development.

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CoolModule™ Integration Simplifies Power Design

By integrating the synchronous buck power stage and inductor into a single package, Reed Semiconductor’s CoolModule™ technology eliminates one of the largest external components required by a conventional buck converter. The result is a smaller solution footprint, fewer components, and simplified placement and routing.

Integrated Inductor Reduces Solution Size

The integrated inductor reduces PCB area and component count compared with discrete buck converter implementations, making the module well suited for high-density designs where board space is limited.

High-Frequency Operation

With switching frequencies up to 4MHz, designers can use smaller external capacitors while maintaining fast transient response and high efficiency. Combined with its compact footprint, the module provides a high-density point-of-load solution for modern electronic systems.

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Flexible Performance for Modern Electronics

Designed for both battery-powered and regulated power rails, the CoolModule™ architecture combines a wide input range with multiple operating modes and factory-trimmed output voltage options.

Wide Input Voltage Range

Supporting 2.4V to 5.5V input voltages, the module is compatible with USB power sources, 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 high efficiency across varying load conditions
• Forced PWM mode for predictable switching behavior in noise-sensitive applications

Factory-Trimmed Output Voltage Options

Multiple fixed output voltage options simplify power supply design while minimizing the external components required for output voltage configuration.

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Integrated Features Improve System Reliability

Integrated monitoring and protection functions simplify implementation while helping protect the power supply and downstream circuitry.

Integrated System Functions

• Up to 2A continuous output current
• ±1% output voltage accuracy
• Power-good (PG) output
• Output discharge function

Built-In Protection

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

These integrated functions reduce the need for additional supervisory circuitry while improving overall system robustness.

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Compact CoolModule™ Packaging

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

By minimizing component count and simplifying layout, the CoolModule™ architecture helps shorten development time while improving design and manufacturing consistency.

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Typical Applications

Portable Consumer Electronics

Compact power conversion for wearables, cameras, portable medical equipment, and other battery-powered products requiring efficient point-of-load power.

Optical Modules

Efficient point-of-load power for optical transceivers and communication modules where PCB area and component height are constrained.

Industrial IoT

High-density power for smart sensors, industrial monitoring equipment, wireless edge devices, and NB-IoT applications.

Embedded Systems

Stable point-of-load power for processors, memory, wireless modules, and other digital circuitry requiring up to 2A of output current.

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Part of the CoolModule™ Family

The RSM3204 is the 2A member of Reed Semiconductor’s CoolModule™ family, a scalable portfolio of integrated-inductor DC/DC power modules. The RSM3203, RSM3204, and RSM3205 share a common compact package architecture while providing different output-current capabilities.

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

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Explore Reed CoolModule™ Power Solutions

The RSM3204 CoolModule™ combines a compact integrated-inductor architecture with 2A output capability for applications requiring more current without sacrificing board space. For lower- or higher-current requirements, designers can select the RSM3203 1A CoolModule™ or RSM3205 3A CoolModule™, providing a scalable approach to compact point-of-load power.