TPS54627DDA

The TPS54627DDA is a synchronous buck step-down DC/DC converter whose integrated one-phase design makes it suitable for a wide range of DC/DC applications. It works best when used in multi-phase applications such as servers, storage devices, and point-of-load regulation. The TPS54627DDA features a wide 4.5V to 17V input range, adjustable output voltage range from 0.6V to 3.8V, and high-current output capabilities up to 27A. In addition, it offers programmable switch transition dead-time, synchronous or asynchronous rectification, programmable current-sharing, as well as low output voltage ripple.

The power stage of the TPS54627DDA consists of two high-side and low-side N-channel MOSFETs. The chip also integrates a pair of bootstrap diodes, a logic-level FET for startup and shutdown, as well as a wide range of protection functions including overvoltage, undervoltage lockout, temperature monitoring, output short-circuit and overcurrent protection. The built-in OCP and OVP features provide independent overcurrent protection and overvoltage protection circuitry, thus protecting the system if the TPS54627DDA goes into an overtemperature fault section.

The TPS54627DDA includes a versatile controller that is capable of operating in line-regulated, hysteretic, as well as pulsed-mode switching. The step-down DC/DC converter works in fixed-frequency, feedback-controlled PWM mode with a minimum on-time to keep the switching frequency low and reduce conducted noise. In PWM mode, the peak inductor current is programmed using the GAIN pin, while the VALRT pin allows users to set the lower bound current limit.

In hysteretic mode, the controller automatically adjusts the output voltage based on the input-output voltage differential, making it suitable for medium-current applications such as battery-charging, FPGA regulation, as well as other light load applications. In line-regulated mode, the TPS54627DDA provides soft-start capabilities, low-noise operation, and protection against line disturbances. In addition, the chip is capable of configuring the output voltage regulation point to ensure a stable and reliable output power, making it suitable for many applications.

The TPS54627DDA is designed to operate in a synchronous rectification or asynchronous rectification mode, based on the user preference. In synchronous rectification mode, the high-side FET acts in a synchronous rectification stage, while in asynchronous rectification mode, the low-side FET acts in an asynchronous rectification stage. This helps reduce the input source capacitance. The TPS54627DDA is available in a space-saving PowerPAD and QFN package with a low profile height for start-up and shutdown time reduction.

In conclusion, the TPS54627DDA is a step-down DC/DC converter with a wide range of features, suitable for a wide range of DC/DC applications. It offers adjustable output voltage and current, programmable switch transition dead-time, configurable current-sharing, as well as a wide range of protection features. The inclusion of dual-FET and logic-level FETs makes it capable of delivering high-currents in a medium-footprint solution.