MAX805LESA+

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Power management integrated circuits (PMIC) are essential components of most electronic devices, as they are responsible for managing and supplying power. Supervisors, a form of PMIC, regulate the power and reset signals of a given device. These supervisors typically provide the reset signal for the system, regular power-on reset, under-voltage reset, and over-voltage reset. The MAX805LESA+ is a supervisor from Maxim Integrated that provides overvoltage, undervoltage, and power on/off reset protection for a given device. In this article, we will discuss the application fields of the MAX805LESA+ and its working principle.

Application Fields

The MAX805LESA+ is an ideal solution for applications that require reset protection to ensure proper system operation. This supervisor can be used in a variety of consumer and industrial products, including mobile phones, tablets, computers, and television sets. Additionally, the MAX805LESA+ can be used in automotive, networking, and safety-critical applications. The supervisor can also be used in medical applications where reliable power-on reset and undervoltage reset are required to ensure system safety.

The MAX805LESA+ is a low-power, ultra-small supervisor that is capable of providing 4.5V to 5.5V reset protection for any given device. The supervisor offers a reset accuracy of +/-5%, as well as a wide operating temperature range of -40°C to +85°C. Additionally, the MAX805LESA+ is designed to be self-correcting, eliminating the need for manual component resetting.

Working Principle

The MAX805LESA+ uses a comparator-based architecture to detect under-voltage and over-voltage situations. When the device\'s supply voltage falls below a predetermined threshold voltage level, the comparator trips and the supervisor generates a reset signal. If the supply voltage falls even further, the supervisor continues to generate reset signals until the voltage rises again. The supervisor also monitors for over-voltage situations, where it will trip if the supply voltage exceeds a pre-defined threshold voltage level. In both cases, the reset signal is active low and remains active until the supply voltage returns to its normal operating voltage level.

The MAX805LESA+ also includes an optional power-on reset function. This provides additional system reliability by ensuring that the device is properly reset after a power-on event. The power-on reset circuit is activated when the supply voltage reaches its expected value. Once activated, it will assert a reset signal until the device is able to enter its normal operating state.

The MAX805LESA+ also features a low-power shutdown function. This function allows the supervisor to be disabled when it is not needed, reducing power consumption and system cost. The low-power shutdown function is activated by a logic low on the shutdown pin. When this pin is activated, the supervisor will be disabled and the output reset signal will become inactive.

Conclusion

The MAX805LESA+ is a low-power, ultra-small supervisor that offers reset protection for a variety of devices. This supervisor provides accurate reset protection from overvoltage, undervoltage and power on/off events. It also includes a power-on reset function for additional system reliability and a low-power shutdown function for reduced power consumption and cost. The MAX805LESA+ is suitable for a wide range of applications, including mobile phones, tablets, computers, television sets, automotive, networking, and safety-critical applications, as well as medical devices.

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