MP4459DQT-LF-Z Integrated Circuits (ICs)

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

MP4459DQT-LF-Z is a DC/DC switching regulator, belonging to the category of Power Management IC (PMIC) voltage regulators. It is designed to perform a variety of conversion tasks between input and output voltages, ranging from 1.2V to 18V, allowing for reliable and high efficiency power conversion. This specific model offers a 3A switch and 850kHz switching frequency.

Switching regulators are more and more widely used in many applications, such as portable electronics, medical systems, and communications equipment. This MP4459DQT-LF-Z model is especially suitable for always-on and portable applications that require a low-noise output and high efficiency with a tight output voltage accuracy and low quiescent current. Its low drop-out voltage and wide input voltage range, combined with its ultra-small 3.5 x 2.5mm QFN package, make the package an ideal choice for any size of printed circuit boards (PCBs) and hand held applications.

General working principle

The switch mode DC/DC converter is a type of power conversion technology that is commonly used because of its excellent performance. It works by rapidly switching the output between two distinct states to generate the desired output voltage and current. The MP4459DQT-LF-Z DC/DC switching regulator follows this same principle, but takes it one step further. The MP4459DQT-LF-Z model consists of an integrated switch, an input voltage rectifier, an internal oscillator and a control circuit.

Functional parts of MP4459DQT-LF-Z DC/DC switching regulator

The integrated switch in the MP4459DQT-LF-Z switching regulator consists of two transistors, a p-channel MOSFET and an n-channel MOSFET. This dual-MOSFET construction allows the MP4459DQT-LF-Z switching regulator to operate at very low output voltages with high efficiency.

The rectifier used in this circuit is a voltage doubler. It works by rectifying the input voltage and then doubling it using one of its two stages. The doubled voltage is then used to power the internal oscillator, which then provides a pulsed signal to control the switches.

The internal oscillator provides a square wave signal that is used to switch the MOSFET transistors on and off. This square wave signal is used to control the switching of the MOSFET transistors, allowing the switching regulator to achieve a desired voltage and current output.

The control circuit is responsible for adjusting the on-time of the MOSFETs to the load. It controls the duration of the ON-time of the MOSFETs to ensure that the output current is constant regardless of the load. It also monitors the output voltage and adjusts the on-time of the MOSFETs as needed to maintain the output voltage.

Conclusion

The MP4459DQT-LF-Z is an extremely powerful, yet power efficient DC/DC switching regulator. Its small form factor and tight output voltage accuracy make it the ideal solution for any size PCB or hand-held application. Its low drop-out voltage, wide input voltage range and ultra-low quiescent current make it a perfect fit for always-on and portable devices that need reliable power.

The specific data is subject to PDF, and the above content is for reference