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Packaging:	Tape & Reel (TR)
Part Status:	Active

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MP8640DL-LF-Z Application Field and Working Principle

Introduction to PMIC - Voltage Regulators - DC DC Switching Regulators

Power Management ICs, or more commonly referred to as PMICs, are integrated circuits that are responsible for power management in a system. This includes the input, output and interconnection of components to ensure efficient energy usage. Voltage regulators are a subset of PMICs that are responsible for controlling the voltage of various components within a system. DC DC switching regulators are a type of voltage regulator that converts the input voltage to a different level for producing the desired output.

MP8640DL-LF-Z Application Field and Working Principle

The MP8640DL-LF-Z is a synchronous DC DC buck switching regulator with an integrated low dropout (LDO) linear regulator. This device is mainly used for battery powered applications, such as tablets, smartphones or wearable electronics. It is designed with a low quiescent current during light load operation, making it ideal for battery-powered devices. It is also designed with high efficiency, allowing it to convert the input voltage to the desired levels while still producing low heat dissipation levels. The MP8640DL-LF-Z is capable of providing up to 2A of output current with an input voltage range of 3.2V to 15V. The output voltage can be adjusted from 0.9V to 6V with the help of an external resistor at the FB pin. It includes built-in overvoltage protection, overcurrent protection and thermal protection, making it very robust and reliable in most applications. The switching regulator’s operating principle is based on a pulse-width modulation (PWM) control scheme where the switch is used to control the duration and hence, the amount of current flowing from the input to the output. When the switch is in the ON state, current flows from the input to the output at a certain voltage. When the switch turns OFF, the current stored in the inductor is delivered to the load, bringing the output voltage close to the set point. The duty cycle of the PWM signal is constantly adjusted, allowing the output voltage to be controlled. The LDO linear regulator included in the MP8640DL-LF-Z ensures the output voltage is stable and devoid of any noise. It is capable of providing up to 250mV of dropout voltage and includes built-in current limit and thermal shutdown protection.

Conclusion

The MP8640DL-LF-Z is a synchronous DC DC buck switching regulator with an integrated low dropout linear regulator that offers high levels of efficiency and low current consumption. The device is mainly used for battery powered applications and it includes integrated protection circuits for improved reliability. The DC DC switching regulator operates on a PWM control scheme while the linear regulator ensures a stable output voltage and low noise levels.

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