TPS54231D

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TPS54231D is an advanced single-stage buck power converter that performs efficiently while meeting the stringent noise requirements expected of modern portable systems. It includes a high-performance switching regulator and a self-biased, high-current intelligent power switch. The DC-to-DC switch regulator is provided with overvoltage protection, adjustable output voltage, and thermal protection. It is suitable for use in a variety of systems, such as notebooks, mobile phones, portable electronics, and other systems that require small footprints and low current consumption.

Introduction

TPS54231D is a step-down DC/DC switching regulator with a fixed 2.5V operating voltage. It is designed to provide up to 3A continuous current from an input voltage range of 2.5V to 20V. The device features short-circuit, overvoltage, and thermal shutdown protection, and is available in both step-up (TPS5424D) and step-down (TPS54231D) versions. The TPS54231D also includes integrated EN pin, selectable power save mode, active feedback loop with cycle-by-cycle current limiting, and remote sensing.

Application field

TPS54231D is a power device that integrates a step-down DC/DC converter and an intelligent power switch. It is applicable to the majority of portable applications that require high conversion efficiency while keeping a small form factor. The device is suitable for a wide range of mobile applications such as mobile phones, PDAs, handheld computers, and other portable systems. It also has features for automotive applications such as undervoltage protection, adjustable output voltage, and thermal shutdown. Additionally, it is a power device for industrial applications such as UPS systems, voltage converters, electromechanical equipment, medical systems, and telecommunications systems.

Working Principle

The TPS54231D operates by using a self-biased intelligent power switch. When the power supply turns on, the device starts in a power-saving mode, which disconnects the power switch from the output and saves power. When the voltage of the input rises above the internal reference threshold, the power switch is turned on, thus connecting the external load to the output. The power switch then keeps the output voltage at the desired level, contrary to the traditional inductor-based converters.

The TPS54231D features a traditional buck topology, where the inductor provides the current to the load, which is regulated by varying the duty cycle of the power switch. The feedback loop circuitry controls the output voltage by comparing it to the input voltage, thus controlling the current flowing through the inductor. The output voltage is adjusted using the internal feedback regulation, while the overvoltage protection circuitry protects the output against current surges and high output voltages.

Conclusion

TPS54231D is an advanced DC/DC switching regulator with a self-biased, high-current intelligent power switch. It is capable of providing up to 3A continuous current from an input voltage range of 2.5V to 20V, and is suitable for a variety of portable and industrial applications. The device has features such as a power save mode, adjustable output voltage, cycle-by-cycle current limiting, and remote sensing. The integrated EN pin and overvoltage protection circuitry protect the output against high output voltages and current surges.

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