MP9928GF-Z

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MP9928GF-Z Application Field and Working Principle

The MP9928GF-Z is a 3A synchronous step-down DC-DC switching controller designed for high-efficiency, high-voltage, power conversion applications such as modern computing and communication equipment. It can be used in applications such as LED lighting, portable, and industrial power systems. The MP9928GF-Z operates at a wide 4.5V to 20V input voltage range and supports a programmable output voltage range of 0.8V to 15V. The IC includes an integrated MOSFET with adjustable current limit and thermal shutdown protection.

The MP9928GF-Z is a highly integrated PMIC voltage regulator and DC-DC switching controller for embedded applications. It is designed to be used in conjunction with a synchronous buck regulator to offer a complete low/medium-power DC-DC power solution. The MP9928GF-Z is designed to be used with an external power MOSFET and an external Schottky diode to achieve a wide range of output voltages and current levels. The voltage regulation is enabled by the on-chip high accuracy voltage reference, allowing for a small output voltage range of 0.8V to 15V. The output voltage is adjusted by a digital potentiometer. The MP9928GF-Z includes an integrated high-side power MOSFET, as well as adjustable current limit, over-temperature and short-circuit protection.

Working Principle

The MP9928GF-Z operates based on constant frequency (256kHz) pulse-width-modulated (PWM) current-mode control. The power MOSFET is driven directly by an on-chip controlled high-side drive circuit, with an integrated voltage clamp circuit to limit the drive voltage in order to meet the input voltage rating. The on-chip synchronous rectifier is clocked at the same frequency as the PWM to synchronize the switching signal. During a PWM cycle, the high side of the synchronous rectifier is closed for the controlling period and the current through the synchronous rectifier is limited by the on-chip current monitor circuitry. In the low side of the synchronous rectifier, the low side drive is controlled by an external signal from the gate of the external MOSFET. The current through the synchronous rectifier is monitored to achieve the current limit protection.

The MP9928GF-Z also includes adjustable soft-start and short-circuit protection. The soft-start circuit provides a ramp function to control the output voltage to reduce the inrush current at turn-on. When there is an over-current situation, the MP9928GF-Z will immediately reduce the output current. In order to protect the device from over-temperature, the MP9928GF-Z includes an on-chip thermal monitor circuit, which will shut down the device when the temperature exceeds the specified limits.

Conclusion

The MP9928GF-Z is a highly integrated DC-DC power solution for embedded applications. It offers wide input and output voltage ranges, adjustable output current limits, soft-start and short-circuit protection as well as on-chip temperature monitoring. The MP9928GF-Z provides a cost and space efficient solution for modern computing and communication equipment, LED lighting, portable and industrial power systems.

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