TPS28225DR

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The TPS28225DR is an integrated power MOSFET driver solution specifically designed for high efficiency dc-dc synchronous buck converter designs. It offers industry leading efficiency and power density for cost-constrained power conversion solutions. The device integrates a high-side and low-side power MOSFET driver with a programmable overvoltage protection feature and a low quiescent current current-mode controller with an adjustable synchronous frequency of 2 MHz minimum.

The TPS28225DR serves as a building block of a highly efficient synchronous buck converter. It integrates the power MOSFET switching device drivers, output overvoltage protection, current mode control, and loop compensation circuitry, saving external components and board size. The device is suitable for 12V-24Vin applications, and is designed in such a way that it can be optimized for a wide range of topologies and components.

The TPS28225DR offers a wide range of features that make it suitable for a variety of high-performance applications. The device features a wide switching frequency range from 300 kHz to 1.5 MHz, and the application circuit can be further optimized for a specific application by adjusting several of the device\'s settings. It provides accurate overvoltage protection with a 0.3% to 65% duty cycle range, allowing for a wide range of operating conditions. Finally, the device supports synchronous rectification, allowing for the use of a smaller inductor by making the power dissipation on the MOSFETs significantly less than in non-synchronous modes.

The TPS28225DR is ideal for use in a wide range of power supply topologies and applications. It can be used in high efficiency synchronous buck converters for power management especially for handheld and portable applications, as well as for Computers, DSPs, FPGAs, and ASICs. The device can also be used in single-phase or multi-phase synchronous buck converters for distributed power applications.

The working principle of the TPS28225DR involves three distinct stages. In the first stage, an external MOSFET, connected to a current sense resistor, monitors the current flowing through the output inductor of the buck converter. The output of the MOSFET is then connected to the voltage-controlled current source (VCCS) of the device, which controls the amount of current that flows into the output inductor. In the second stage, the output overvoltage comparator (OVCOMP) monitors the output voltage of the device, and if the output voltage exceeds the set value, it sends a signal to the low side driver to turn off the switch, preventing the output voltage from overshooting. In the third stage, a synchronous rectifier turns off the low side switch when the output voltage is at its peak and powers the integrated bootstrap diode, which helps regulate the voltage on the high side switch.

Overall, the TPS28225DR is an integrated power MOSFET driver solution that is specifically designed for high efficiency dc-dc synchronous buck converter designs. It integrates the power MOSFET switching device drivers, output overvoltage protection, current mode control, and loop compensation circuitry, allowing for a wide range of applications and cost-constrained power conversion solutions. In addition, its synchronous rectification and adjustable switching frequency range makes it well-suited for optimizing the performance of a specific application.

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