MPQ2019GN-33-AEC1-Z

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As power management Integrated Circuits (PMICs) become increasingly popular in an ever-broadening range of applications, it is important to understand the design, construction and operation of Voltage Regulators – Linear (VR-Ls). The MPQ2019GN-33-AEC1-Z is one example of a modern-day integrated linear regulator, and by exploring its design, construction and operation, this article aims to provide an in-depth understanding of how it works.

Design

The MPQ2019GN-33-AEC1-Z is a Single-Channel, integrated linear voltage regulator. Its initial design was based on a classic two-terminal regulator consisting of a current source, an error amplifier and a series-element current limiter. The regulator is tolerant of input variations up to 1V above and below its normal operating range of 2.5V. It also provides a low output noise level of typically 60 μVrms over a 10 kHz frequency range, a high power supply rejection ratio (PSRR) of better than 81 dB and a low drop-out voltage of 160 mV at full load.

Construction

The MPQ2019GN-33-AEC1-Z is constructed from a range of components, including power transistors, resistors and an error amplifiers, all of which are integrated on a monolithic chip. A P-channel power MOSFET is used as the series pass element and is driven by an N-channel MOSFET, which acts as the error amplifier. The current limiting element consists of two transistors, one P-channel, the other an N-channel. These two transistors act as the current limiter and the regulator. The output voltage is monitored by the error amplifier, which then adjusts the series pass element to maintain a constant current output.

Operation

The MPQ2019GN-33-AEC1-Z is designed to operate with a fixed output voltage of 2.5V. The input voltage is monitored by the error amplifier, which then adjusts the current flow through the series pass element to maintain a constant output voltage. The voltage is regulated by the negative feedback loop and the series pass element drives the output voltage (Vout) to the required level. The current through the series pass element is limited by the current limiter, which ensures that a maximum permissible current is maintained, preventing the regulator from being overloaded.

The MPQ2019GN-33-AEC1-Z is designed to operate over a wide temperature range and can handle transient loads. It includes a number of safety features such as over-voltage and over-temperature protection, and it also provides a diagnostic output that signals the presence of an input fault.

Conclusion

The MPQ2019GN-33-AEC1-Z is an impressive integrated linear voltage regulator that is suitable for a wide range of applications. Its design and construction, as well as its operation, offer high performance, outstanding power supply rejection ratio, excellent regulation and wide input and output range.

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