TPS54540QDDARQ1 Integrated Circuits (ICs)

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TPS54540QDDARQ1 is a state-of-the-art synchronous buck DC-DC switching regulator that integrates two 0.8-A MOSFETs and an onboard 6-A driver with separate states. It features very low quiescent current operation, adjustable and/or fixed output voltage, and allows a very compact design.

Application Field

This device is suitable for applications requiring higher current output with lower switching losses. TPS54540QDDARQ1 is ideal for applications such as Industrial/ embedded systems, ASIC bias and post-regulation, and telecom system. Moreover, it offers a better transient response and steady-state performance compared to traditional voltage regulators.

Working Principle

The TPS54540QDDARQ1 works on the principle of synchronous buck DC-DC. In synchronous buck type conversion, the output voltage can be regulated by changing the duty cycle of an internal switch, which is called an internal switch. This switch allows current to flow through the output filter inductor and capacitor. When the switch is on, the inductor stores energy and the capacitor stores energy. When the switch is off, the capacitor and inductor discharge their stored energy to maintain the output voltage.

The TPS54540QDDARQ1 contains two N-channel power MOSFETs to produce the output voltage. The MOSFETs are driven by a built-in low-side driver which adjusts the duty cycle of the switch to regulate the output voltage. The voltage is monitored by a high-side sense circuit and feedback is sent to the low-side driver circuit. Additionally, the TPS54540QDDARQ1 employs a Constant-On-Time (COT) control scheme to reduce the pulse-width-modulation (PWM) noise for improved system reliability.

The TPS54540QDDARQ1 also includes a comprehensive range of features intended to improve system performance and reduce design time. It supports multiple enable/context pin enabling/disabling device, independent sleep mode and enable/disable mode, and has integrated Soft-Start and current limit features. Furthermore, it has integrated over-voltage and under-voltage fault protection features that activate when the output goes above or below a programmed threshold.

Conclusion

The TPS54540QDDARQ1 voltage regulator is an efficient, reliable, and cost-effective solution for DC-DC applications requiring high-current output with low switching losses. It is suitable for a wide range of applications, from industrial and embedded computing to telecom systems. Additionally, its onboard 6A driver, Constant-On-Time control scheme, and integrated fault protection features reduce design time and improve system performance.

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