TPS56425xx 4A 600kHz Synchronous Step-Down Converter

Introduction

The Texas Instruments TPS56425xx family is a compact synchronous buck converter designed to efficiently reduce a higher DC input voltage to a regulated lower output voltage. With integrated MOSFETs, up to 4A continuous output capability, and a small SOT-563 package, it is well suited to space-constrained power designs.

Part Description

The TPS56425xx is a high-efficiency DC/DC step-down regulator operating from input voltages between 3V and 17V. It can provide up to 4A of continuous output current and supports adjustable output voltages from 0.6V to 10V.

Its synchronous converter architecture uses integrated high-side and low-side MOSFETs, reducing the number of required external components while improving efficiency compared with diode-based buck converters. The fixed 600kHz switching frequency helps enable the use of compact inductors and capacitors.

The device uses TI D-CAP3 control technology for fast transient response and simplified compensation requirements. Built-in protection functions help improve system robustness by addressing conditions such as overcurrent, thermal overload, undervoltage lockout, and output short circuits.

Key characteristics include:

• 3V to 17V input-voltage range
• Up to 4A continuous output current
• Adjustable 0.6V to 10V output voltage
• 600kHz switching operation
• Integrated synchronous MOSFETs
• D-CAP3 control architecture
• Compact 1.6mm × 1.6mm SOT-563 package
• Integrated protection features

Applications

Potential applications for the TPS56425xx include:

• Point-of-load power supplies
• FPGA and CPLD core-voltage rails
• Microprocessor and microcontroller supplies
• DDR memory power rails
• Embedded computing modules
• Industrial control electronics
• Portable instrumentation
• Communication modules
• Network equipment
• Sensor hubs and edge-processing systems
• Battery-powered products with regulated internal rails
• Compact consumer electronics

Industries

The TPS56425xx can be used in a variety of industries, including:

• Industrial automation
• Telecommunications
• Networking and data communications
• Consumer electronics
• Computing and embedded systems
• Test and measurement
• Building automation
• Smart energy systems
• Medical electronics
• Automotive auxiliary electronics
• Internet of Things devices
• Robotics and automation

Usage Ideas

1. FPGA Core Supply
   Create a compact 1.0V, 1.2V, or 1.8V power rail for an FPGA, using the converter to step down a 5V, 9V, or 12V system supply.

2. 12V Industrial Controller Power Stage
   Use the TPS56425xx to generate a regulated 3.3V or 5V rail for a microcontroller, sensors, communication interfaces, and supporting logic in an industrial controller.

3. Portable Embedded Computer Module
   Design a high-current 1.8V or 3.3V supply from a battery or adapter input to power a single-board computer peripheral, wireless module, or display subsystem.

Conclusion

The TPS56425xx is a small, integrated, and efficient synchronous buck converter for designs requiring a regulated low-voltage supply from a 3V to 17V source. Its 4A output capability, adjustable voltage range, 600kHz switching frequency, D-CAP3 control, and integrated protections make it a practical power-management option for compact industrial, consumer, communications, and embedded applications.