RS53204

High-Density 2A Buck Converter for Space-Constrained Designs

The RS53204 is a high-efficiency 2A synchronous buck converter designed for applications that demand high power density, fast transient response, and minimal PCB area. Utilizing Constant-On-Time (COT) control, the device delivers excellent dynamic performance while supporting switching frequencies up to 4MHz, allowing designers to reduce the size of external inductors and capacitors.

Operating from a 2.4V to 5.5V input voltage range, this converter is ideal for powering application processors, wireless modules, image sensors, optical modules, SSDs, and embedded systems where both board space and efficiency are critical.

Available in a tiny 0.8mm × 1.2mm 6-ball WLCSP, it combines integrated MOSFETs, comprehensive protection, and flexible operating modes into a compact, easy-to-implement power solution.

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Optimize Performance in Space-Constrained Applications

Modern electronic systems require power supplies that respond instantly to changing load conditions while consuming as little PCB area as possible. The combination of Constant-On-Time control, high switching frequency, and integrated power MOSFETs enables designers to build compact power supplies without compromising dynamic performance.

Fast Transient Response

Constant-On-Time (COT) control responds rapidly to load transients, maintaining stable output voltage for processors, FPGAs, memory, and high-speed digital circuits that experience frequent current changes.

High Switching Frequency

With switching frequencies up to 4MHz, smaller inductors and output capacitors can be used, reducing solution size while maintaining excellent efficiency and transient performance.

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Flexible Design for a Wide Range of Applications

The converter supports a broad range of portable, embedded, and industrial applications through flexible operating modes and factory-programmed output voltage options.

Wide Input Voltage Range

Supporting 2.4V to 5.5V input voltages, the device is compatible with regulated intermediate rails, USB power sources, and single-cell lithium-ion battery systems.

Flexible Operating Modes

Designers can select the operating mode best suited to their application:

• Automatic PFM/PWM mode for maximum efficiency under varying load conditions.
• Forced PWM mode for applications requiring constant switching frequency and reduced output ripple.

Factory-Programmed Output Voltages

Five preset output voltage options simplify system design while reducing external component count:

• 0.6V
• 1.2V
• 1.8V
• 2.5V
• 3.3V

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Integrated Protection and High Reliability

Built-in protection functions improve system robustness while reducing the need for external supervisory circuitry.

Comprehensive Protection Features

Integrated protection includes:

• Overcurrent protection
• Short-circuit protection
• Power Good output
• Output discharge function

These features help improve system reliability while simplifying overall power supply design.

Integrated Low-Loss MOSFETs

Integrated 26mΩ high-side and 26mΩ low-side MOSFETs minimize conduction losses and improve efficiency without requiring external switching devices.

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Tiny Package for High-Density Power Designs

The ultra-small 0.8mm × 1.2mm 6-ball WLCSP enables extremely compact PCB layouts for smartphones, wearable electronics, optical modules, SSDs, cameras, and industrial embedded systems.

Combined with high-frequency operation and minimal external components, the result is a highly integrated Point-of-Load power solution that maximizes available board space.

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Part of Reed’s Compact Buck Converter Family

The RS53204 belongs to Reed Semiconductor’s family of high-frequency synchronous buck converters designed for scalable current capability while maintaining a common architecture and compact footprint.

Using the same architecture across the family allows designers to increase available output current while minimizing PCB redesign and simplifying qualification.

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Explore Reed’s Point-of-Load Power Solutions

The RS53204 complements Reed Semiconductor’s expanding portfolio of compact Point-of-Load converters, digital PMBus™ regulators, multiphase controllers, Smart Power Stages, and Power Blocks for applications ranging from portable electronics to AI infrastructure.

The input voltage of RS53203/04/05 is from 2.4V to 5.5V. The output current is up to 3A.

RS53203/04/05 are available in a 0.8mm x 1.2 mm, 6-pin WLCSP package.