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Power Management Integrated Circuits (PMICs) are becoming increasingly important as they are used to manage critical power systems in many devices. PMICs ensure optimal efficiency and performance in each type of system and are used in a wide range of industries, from industrial, to consumer, to automotive applications.

Within the PMIC market, supervisors are becoming increasingly important devices. Supervisors, also known as voltage supervisors or reset supervisors, are designed to monitor and control the power supply and protect the system from power loss or overvoltage conditions. One such device is the MAX794CSE+, a reset supervisor from Maxim Integrated. This article will provide details about the MAX794CSE+ application field and working principle.

The MAX794CSE+ is a dual voltage supervisor IC specifically designed for low power applications. It is designed to provide a reset signal to the system whenever the power supply drops below a certain threshold. The device features two independent voltage monitor input pins (VCC and VIN), which is useful in systems that require independent power supplies or lower power signaling.

Specifically, the MAX794CSE+ is designed to operate over a wide input voltage range of 1.8V to 28V. It offers an adjustable reset threshold voltage range of 2.5V to 4.1V, and adjustable reset timeout delay of up to 4.096 seconds. The device also provides built-in power-on reset (POR) and power-off reset (POF) functions and an open drain N-channel logic output that can be connected to an external pull-up resistor or logic level shifter.

In terms of protection features, the MAX794CSE+ provides overvoltage (OV), undervoltage (UV) and input power disconnection detection. The device also features programmable alarm functions, which allow the user to select either an active high or active low alarm signal output.

In terms of application fields, the MAX794CSE+ is suitable for a range of low power applications, such as automotive, consumer and industrial applications. This includes automotive audio and navigation systems, cameras, small appliances, LCD monitors and laptops. It is also suitable for point of sale systems, medical equipment, and other devices that require high operating temperature ranges.

In terms of its working principle, the MAX794CSE+ features two voltage monitor input pins (VCC and VIN) to monitor and control the power supply. The device features an adjustable reset threshold which can be set to the desired voltage level. When the power supply drops below the set threshold, the device will assert a reset signal to the system, which can be used to reset the system and prevent overvoltage conditions. Additionally, the device also features a power-on reset (POR) and power-off reset (POF) function, which assert a reset signal whenever the power supply is turned on or off, as well as programmable alarm functions, which can be used to select either an active high or active low alarm signal output.

Overall, the MAX794CSE+ is an ideal supervisor IC for low power applications. It is designed to operate over a wide input voltage range and provide protection against overvoltage and undervoltage conditions. It is suitable for a range of low power applications, such as automotive, consumer and industrial applications.

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