TPS54561DPRT

TPS54561DPRT Application Field and Working Principle

The TPS54561DPRT is a high efficiency, tiny, integrated, synchronous step-down DC-DC converter that offers up to 4A of output current in a wide 4.5V to 24V input voltage range. This device operates in either PWM or PFMmode to deliver the best combination of efficiency, output accuracy, and dynamic response. The device is ideal for consumer electronics, as well as automotive, industrial, and general purpose applications.

Features

• Wide 4.5V to 24V input voltage range
• Integrated high-side and low-side power MOSFETs
• Up to 4A output current
• 2.5V - 4.1V output voltage range
• Fixed-frequency, synchronous PWM or PFM mode operation
• High efficiency with low stand-by current consumption
• Adaptive gate drive
• Enable pin for power-off
• Thermal shutdown protection
• Reverse current protection
• Undervoltage lockout (UVLO)

Applications

• Consumer electronics
• Automotive
• Industrial control
• General purpose applications

Working Principle

The TPS54561DPRT is a synchronous buck converter with an internal high-side power MOSFET and an internal low-side MOSFET. It employs synchronous rectification technology to produce high efficiency power conversion by connecting the high and low side switches in a bridge configuration. The input voltage is high enough to drive the high-side switch. The output voltage is regulated by sensing the output current and continuously adjusts the duty cycle of both the high-side and the low-side switches. The variation in the duty cycle allows the output voltage to remain within its desired range.

The device employs a fixed frequency PWM or PFM operation to deliver the best combination of efficiency, output accuracy, and dynamic response. It also provides a power-good indicator to indicate output voltage status, as well as enable and power-down functions. A unique feature of the TPS54561DPRT is its adaptive gate drive. In cases of high output current, the device can adjust the switching frequency, reducing power losses and prolonging switch lifetime. It also provides a built-in thermal shutdown protection to protect the device from over temperature conditions.

Conclusion

The TPS54561DPRT is a high efficiency, tiny, integrated, synchronous step-down DC-DC converter that offers up to 4A of output current in a wide 4.5V to 24V input voltage range. With its wide range of features and applications, it is ideal for consumer electronics, as well as automotive, industrial, and general purpose applications.