PT5805N

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The PT5805N is a part of DC-DC Converters family and is an integrated high-performance DC-DC buck converter with low quiescent current. It includes a low-ripple 1.2A synchronous rectified low-dropout (LDR) linear regulator controller and a high/low side MOSFET driver. It is capable of operating from a regulated voltage source such as a Li-ion battery or other similar power sources.

The PT5805N device is an ideal solution for power management applications such as laptop power supply or cell phones. It provides excellent load and line regulation, fast transient response and low output noise. The device features a wide input voltage range and low noise performance through an enhanced loop filter design. The PT5805N also offers programmable output voltage, over-voltage protection, thermal protection and current limit protection.

The PT5805N offers a choice of output voltages from 0.84V to 5V with 1% accuracy, which allows designers to achieve better compliance with system requirements. The PT5805N has an adjustable switching frequency from 200kHz to 2.2MHz. This feature helps reduce the size of the external inductors and capacitors and minimize power losses.

The working principle of the PT5805N involves converting the input voltage to a regulated DC output voltage with the help of a synchronous buck converter topology that uses two switches and an inductor. The synchronous buck converter is a switch-mode power supply configuration that works by converting an input voltage to a regulated lower voltage output. The PT5805N’s internal MOSFETs are driven in a way to form a synchronous rectifier circuit with a buck converter configuration.

The PT5805N has two main stages; an input stage and an output stage. In the input stage, a PWM circuit generates a signal into a low pass filter that integrates the signal and provides the current required by the power supply. The output stage provides the output voltage, which is inversely proportional to the duty cycle of the PWM signal. The output stage can also provide protection if the load current exceeds the predetermined current level.

The PT5805N offers many benefits, like low power consumption, fast transient response and wide output voltage range. It is a convenient choice for power management applications due to its wide input voltage range, low voltage drop, low ripple and good regulation. The programmable output voltage makes it possible to tailor the voltage for different applications. In addition, the PT5805N offers integrated overvoltage protection, current limit protection and thermal protection for improved safety and reliability.

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