TPS549D22RVFT

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Modern switch mode regulators are used extensively in power management applications to convert and distribute fixed voltages, often to serve the needs of a variety of integrated circuits in the system. One such regulator is the TPS549D22RVFT, a dual-output, high voltage, buck (step-down) regulator. Let’s take a closer look at its application field and working principle.

Application Field

The TPS549D22RVFT generates a balanced low and high voltage output from a single input voltage, typically +2.5V to +20V. The maximum output current is 500mA for each output, with a maximum output voltage of 2.5V and 5V. A typical application is in the circuit powering CPUs and other SoC digital and analog cores.

The high and low PO output can be configured in a variety of ways, and provide independent voltage settings, plus a power-good signal, a power switch enable, and a VIN regulator for monitoring input voltage. It also has MODE and PHASE options, allowing the regulator to be triggered in easy-to-use parallel or sequenced operation, as per specific application needs.

Working Principle

The TPS549D22RVFT is a simple, yet sophisticated, high voltage buck regulator. It is based on an efficient pulse width modulation (PWM) control scheme, which can provide a regulated 5V or 2.5V output with high efficiency. The PWM circuitry operates as a "pulse frequency" converter, converting the high input voltage to the required output voltage levels with a frequency of 500kHz.

The voltage regulator senses the input voltage with a sense resistor and compares the voltage level to an internal 2.5V reference. The difference is then amplified and compared to a linear ramp voltage generated from an oscillator circuit. The pulse width of the pulses generated is adjusted in such a way that the output voltage is equal to the input divided by a predefined ratio.

The TPS549D22RVFT also incorporates a latch-off feature which is activated by an overcurrent or short circuit. This helps protect the circuit from any kind of fault currents. The regulator also has a thermal shutdown feature, which automatically shuts down the regulator if the die temperature exceeds a safe level. This feature prevents any damage that could be caused by an overload condition.

Conclusion

The TPS549D22RVFT is a dual-output, high voltage, buck regulator with a wide range of features. It is designed to convert a high input voltage to required low/high output voltage levels followed by regulation. Its PWM control scheme ensures excellent accuracy, efficiency, and high power conversion. The integrated overcurrent protection, thermal shutdown, and latch-off features ensure reliable operation. All these features make the TPS549D22RVFT an ideal solution for powering CPUs and other SoC digital and analog cores.

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