MP4558DN-LF

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A PMIC - Voltage Regulator - DC DC Switching Regulators is a component of an electrical circuit that is used to regulate the output voltage or current of a power supply. The MP4558DN-LF is used to provide an adjustable and constant output voltage level. The MP4558DN-LF is specifically designed for mobile and wearable applications such as headsets

The MP4558DN-LF has two typical application fields they are any device powered with a USB cable by the target system and a device powered from a minimum of 2.6V to 5.5V by a coin-cell battery. And the working principle of the MP4558DN-LF is that during the voltage regulation process it converts the input voltage to an output voltage via a control loop. The MP4558DN-LF is built on the idea of “constant-current control”, meaning that it constantly monitors the output current and adjusts it accordingly to compensate for the load resistance variations.

The MP4558DN-LF has four pin designations with three pins for the input voltage, ground and output voltage and the fourth pin is used for external sensing. The input voltage is connected to pin VIN, the ground is connected to pin GND, and the output voltage is connected to pin VOUT. The external sensing pin is used to sense the output power for current limit. The device is designed to operate in boost, buck, or buck-boost mode by sensing the input voltage and the output voltage.

The MP4558DN-LF utilizes a voltage feedback loop to regulate the output voltage. The transfer function inside the loop regulates the output voltage to a precise level. The voltage loop consists of an internal error amplifier, two external resistors and one capacitor which are connected as follows. The two external resistors are connected to the IN- and OUT pins, and to the common pin which is connected to the internal error amplifier. The output voltage is measured between OUT and the GND pins, while a reference voltage is applied to the IN pin of the error amplifier. The output voltage is regulated to a precise level by the transfer function of the voltage loop.

The MP4558DN-LF is a low quiescent current and low noise switching DC/DC converter designed for portable, mobile and PC applications. It can deliver output current up to 1.5A and switching frequency is programmable from 1.1MHz to 8 MHz. The device supports adjustable and constant output voltage from 0.7V to 5.0V. The switching frequency is adjustable from 1.1 MHz to 8MHz, which allows for easy implementation of a wide range of applications such as power management in consumer electronics, handheld devices and wearables.

The MP4558DN-LF has enhanced protection features that include short circuit protection, over temperature protection, over current protection and under voltage lockout circuit. The device is offered in a 8-pin WSON package with a total height of 1.0 mm making it suitable for size-constrained applications. It also features a low shut-down mode current which further enhances the efficiency of the power supply design.

In conclusion, the MP4558DN-LF is a Low Quiescent Current and Low Noise DC/DC converter and an adjustable and constant voltage regulator, especially suitable for mobile and wearable applications. The switching frequency is adjustable making it a versatile device and the low profile package reduces the size of the power supply design. In addition, the device has a number of enhanced protection features making it a safe and reliable solution for a wide range of applications.

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