TPS54540BQDDARQ1 Integrated Circuits (ICs)

PMIC - Voltage Regulators - DC DC Switching Regulators

The TPS54540BQDDARQ1 is a simple solution for low-cost, low-input voltage DC to DC buck conversion applications. It is a fifth-generation integrated step-down switching regulator from Texas Instruments and is specifically designed for flexibility and ease of design. This application field and working principle of the TPS54540BQDDARQ1 will be discussed in further detail.

Application Field

The TPS54540BQDDARQ1 is suitable for a variety of applications requiring a low-power, low-input-voltage buck regulator. It is designed to provide a cost-effective solution for embedded systems and/or automotive applications. It can be used in applications such as mobile and computing systems, communication systems, and consumer products. Some of these applications require an optimized low-profile package with low power loss and a minimum number of external components.

Working Principle

The TPS54540BQDDARQ1 works by using a buck topology-based drive circuit to generate a pulse-width-modulated (PWM) signal, which is sent to a power stage. The power stage is comprised of two switches, an inductor, and an output capacitor. When the switch is turned on, the input current starts to flow towards the load and the inductor stores a magnetic field. When the switch is turned off, the stored magnetic field collapses and a current flows from the inductor back to the battery in the opposite direction, filling the output capacitor with the output voltage. This process repeats in a continuous cycle, regulating the output voltage.

The TPS54540BQDDARQ1 is different from other buck regulators because it is able to work with input voltages as low as 0.2 V. This feature is enabled by a precision low-side switch threshold voltage (VLS) control circuitry. It also includes a peak-current-mode (PCM) control for an accurate low-current situation, as well as over-current and over-voltage protection. The on-board PWM features allow users to customize the output voltage and improve efficiency. Furthermore, a programmable-soft-start feature helps limit inrush currents when powering up the system.

Summary

The TPS54540BQDDARQ1 is a simple and cost-effective solution for low-power, low-input-voltage DC to DC buck conversion applications. Its optimized low-profile package and low power loss provides a solution for embedded and automotive applications. Furthermore, it is capable of operating with input voltages as low as 0.2 V, and it also includes a PCM control and over-current and over-voltage protection. Finally, a programmable soft-start feature helps limit inrush current when the system is powered up.