MPQ3426DL-LF-Z

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MPQ3426DL-LF-Z belongs to PMIC - Voltage Regulators - DC DC Switching Regulators. It is a synchronous step-down DC-DC converter, designed to deliver up to 3A current from an input voltage of 4.5V to 20V and output a voltage of 0.25V to 7V, allowing for flexible power delivery. It has a built-in high frequency fixed off-time control architecture and an internal switching MOSFET. This high power density design is ideal for use in space constrained applications.

Application Field

The MPQ3426DL-LF-Z is designed as a general-purpose DC/DC regulator, suitable for applications such as PC peripherals and consumer electronic products. It can also be used in automotive and battery applications, making it highly scalable and adaptable to a variety of power profiles. With a large operating temperature range, it can handle extreme ambient temperatures, while its high efficiency ensures it keeps the system temperatures down, preventing any system degradation or dysfunction.

The MPQ3426 is also an excellent choice for powering LCD panels in applications such as laptops, tablet PCs, and televisions. It provides a high power output with a low quiescent current, resulting in excellent power efficiency, thereby increasing battery life. Additionally, its adaptive off-time control design, allowing for low electromagnetic interference, helps to reduce noise and other radiative emissions, which makes it suitable for use in low-EMI-constrained systems.

Working Principle

As a synchronous DC-DC converter, the MPQ3426DL-LF-Z employs a fixed-frequency, off-time control architecture. The main components of the architecture consist of an internal switching MOSFET, control logic, and feedback circuitry. The converter operates by first regulating the output current of the input line by boosting or bucking the converter. It then regulates the output voltage using a conventional feedback loop.

The internal MOSFET is responsible for regulating the power output. It is activated at the beginning of each cycle, when the internal control voltage reaches its rising threshold, and subsequently completes the power delivery cycle until either the output current or voltage has been satisfied.

The feedback circuitry regulates the output voltage and current. Incoming feedback signals are processed by integrated logic which adjusts the rise of the internal control voltage, effectively regulating the power delivery of the converter.

The control logic also plays a role in fine-tuning the performance of the converter. Its adaptive off-time tuning allows it to be used in systems with low noise and low electromagnetic interference (EMI). Additionally, it provides an additional layer of protection in the form of an overvoltage, overtemperature and overload protection.

Conclusion

The MPQ3426DL-LF-Z is a robust and reliable DC/DC converter specifically designed for a wide range of applications. Its high power density, large operating temperature range and adaptive off-time control architecture make it highly suitable for noise- and EMI-constrained systems. Furthermore, its feedback circuitry allows for precise voltage and current regulation, ensuring that power is efficiently regulated for optimal system performance.

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