MP38900DL-B-LF-Z

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DC-DC switching regulators, also known as voltage regulators, are a common and widely used category of power management integrated circuits (PMICs). They provide a reliable mean of regulating the output voltage from a DC source by using natural switching of dc circuits.

The MP38900DL-B-LF-Z is a fixed 800kHz switching DC-DC regulator with integrated MOSFETs. It is designed to provide a regulated output voltage with a typical efficiency of 91% over the input voltage range of 4.5V to 30V. The regulator is offered in a compact SOIC-8 package with an operating temperature range of -40°C to 125°C.

The MP38900DL-B-LF-Z is designed to take the input voltage, boost it and step it down to the desired output voltage. It includes internal compensation and feeds-back to regulate and maintain the output voltage at the desired level. The device is capable of regulating the output voltage within a wide voltage ranging from 1.4V to 10V that can be set with an external resistor.

The main application fields of the MP38900DL-B-LF-Z are portable systems and low power applications that require precise voltage regulation and minimal board space. Examples include digital cameras and portable computers, cell phones and other portable applications. Other uses include AC/DC power supplies, and LED driver solutions.

In addition to the adjustable voltage capability, this switching regulator offers low power consumption, low noise and excellent line/load transient response. The on-board MOSFETs reduce external component count, saving space and overall cost of product development.

The regulated output voltage of the MP38900DL-B-LF-Z can be obtained in two ways. The first is the compensated, switching boost regulation, which uses a feedback network to adjust the output voltage. The second is the linear regulation that uses a greater amount of external passive components than the boost regulation, but requires lower switching frequency and very low ripple to maintain a low output voltage regulation, which can reach up to 15mV.

The operation of the MP38900DL-B-LF-Z involves a fixed, 700kHz switching frequency which is typical of modern switching regulators. The switching frequency is regulated using a trimming resistor, which is located inside the SOIC-8 package. External regulation is also possible using an analog input signal.

External components required to complete the regulator circuit include an input capacitor, an output capacitor, an inductor, and an output diode. The input capacitor is used to filter the input voltage and reduce feed-forward currents. The output capacitor is necessary for boosting the switching regulator output power. The inductor is needed to filter the output voltage and reduce its ripples. Finally, the output diode is required for rectifying the output current.

In conclusion, the MP38900DL-B-LF-Z is a state-of-the-art integrated DC-DC switching regulator with PWM current-mode control and integrated MOSFETs that can regulate input voltages ranging from 4.5V to 30V and output voltages anywhere between 1.4V and 10V. It can be used in a variety of portable systems, applications and AC/DC power supplies, while providing high efficiency and low noise. The device requires only a few external components to complete the circuit, making it ideal for space-constrained applications.

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