MP9473GL-Z

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The MP9473GL-Z is a high performance DC-DC switching regulator from a range of outside voltage buck regulator devices by Monolithic Power Systems (MPS). As a voltage regulator, it is classified as a PMIC (Power Management Integrated Circuit) and is part of the Voltage Regulators section, with DC DC Switching Regulators being the specific category. It is a synchronous step-down regulator capable of delivering up to 4 Amps of continuous current with a single fixed output voltage with the input voltage ranging from 4.5V up to 40V. It incorporates an integrated press-down switch and a synchronous rectifier, with an output voltage specified within 0.5~0.8V of its nominal value.

The regulator offers very high efficiency through its synchronous rectifying design and also incorporates a frequency modulation feature - providing additional accuracy to the current limit setting. It also provides protection against thermal overload, current limiting protection and reverse current protection with an operating junction temperature of -40°C to 125°C. This makes it suitable for use in a wide range of applications, such as automotive, industrial applications and power adapters for notebooks, tablets and other devices requiring a regulated source of output power.

The functionality and performance of this device is due to the MOSFETs and the various control and protection circuits it incorporates. The two MOSFETs function as a press-down switch to supply a regulated output voltage from the input. The input voltage is regulated by a first order internal compensation loop, which reduces the ripple voltage at the output. To protect the device against current and thermal overload, the IC is designed with current limit and over temperature protection circuits. The device also contains a thermal shutdown circuit to maintain the junction temperature within the specified operating temperature range.

The DC-DC switching regulator operates in the PWM (pulse width modulation) mode - switching the MOSFET on and off at a fixed frequency to regulate the output voltage. When the MOSFET is switched off, the current flow through it is nearly zero, causing no power loss. At the switching point, the maximum current requirement is limited only by the inductor and the power dissipation at the output cannot be higher than the total input power of the IC. Thus, the device is capable of providing excellent efficiency, with low output voltage ripple and fast transient response.

Overall, the MP9473GL-Z is a high performance, versatile DC-DC switching regulator and is ideal for use in many applications requiring a regulated source of output power. Thanks to its features such as PWM mode switching, temperature protection and current limiting protection, it offers a high level of reliability and performance. It also offers a high efficiency through its synchronous rectifying design, as well as fast transient responses and low output voltage ripple.

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