MP8772GQ-Z

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MP8772GQ-Z Application Field and Working Principle

The MP8772GQ-Z is a DC buck converter power IC, belonging to the category of PMIC - Voltage Regulators - DC DC Switching Regulators. It is a highly integrated, efficient, and cost effective solution for DC-DC power conversion, allowing for a simple and fast implementation of a step-down DC-DC regulator solution. This device is specifically designed for portable applications, providing excellent efficiency and superior performance for handheld and notebook applications.

The MP8772GQ-Z includes a wide input voltage range from 2.7V to 6V, and pumps out a regulated output current of up to 2A. Built-in high efficiency buck converters ensure its performance in a variety of applications. Low power supply ripple and EMI are achieved through the use of innovative design techniques to reduce switching noise.

The MP8772GQ-Z integrates both the high-side and low-side N-MOS noise reduction power switches, P-MOSFETs, gate drivers, error amplifiers, current sense network, oscillator, and an internal loop compensation circuitry. It also features a user-selectable output voltage, which can be dynamically adjusted with external resistors.

The MP8772GQ-Z has full protection features, including current limit, short circuit protection (SCP), over temperature protection (OTP) and over voltage protection (OVP). This device also allows the user to enjoy overall low power consumption while the system is in a power saving mode. It is also capable of fast switching frequency up to 1.2MHz, minimizing external component size and cost while achieving a small physical footprint.

The working principle of the MP8772GQ-Z can be broken down into three stages: regulation, current sensing and control, and protection. In the regulation state, the voltage regulator uses an error amplifier of the control loop to compare the output voltage to an internal or external reference to maintain a constant output voltage. A feedback resistor divider sets the output voltage with an accuracy of less than 2%.

In the current sensing and control stage, a sense resistor (Rsense) sense the output current and provide analog feedback for the error amplifier. The error amplifier then adjusts the duty cycle of the internal PWM control circuit and the P-MOSFETs. The internal oscillator sets the PWM frequency and the duty cycle of the output stage.

In the protection state, the voltage regulator incorporates several protection circuits. The current limit will limit the output current to the point where a constant current is provided. The short circuit protection functions to protect the IC by shutting off the output stage when an overload is detected. The over voltage and over temperature protection prevents the output voltages from exceeding an established margin, protecting the converter and its followed load.

Overall, the MP8772GQ-Z is a cost effective and highly integrated power management IC, providing an ideal solution to today’s step-down DC-DC converter designs. With integrated current sensing and control operations, wide input voltage range, low power ripple, switchable output voltage, and comprehensive protection features, this device is sure to suit your DC-DC converter needs.

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