MAX6366LKA29+

PMIC - Supervisors : MAX6366LKA29+ Application Field and Working Principle

PMIC, or Power Management Integrated Circuit, is an integrated circuit device that includes one or more voltage regulators and may have additional components such as FETs, comparators, and digital logic to support power management functions. One of the main components of a PMIC is a supervisor, which facilitates a safe and reliable power-on reset (POR) and works in coordination with the circuit’s active components. It is important to understand the functionality and application fields of a MAX6366LKA29+ supervisor in order to ensure its proper operation and guarantee the reliable power management of a device.

Background

A power-on reset (POR) is an electronic component or circuit designed to ensure the correct initialization of a device after it is powered up or reset. It initiates the sequence of events by which the controller will be put into a known state and applies a reset signal to the processor’s reset pin. Without this component, the processor might enter an unknown state and have difficulty initiating device functions properly.

In most cases, a simple external POR circuit would be sufficient, but a supervisor adds additional features to obtain a safe POR, such as validating the VDD voltage and monitoring the system’s oscillations, which is of crucial importance for consumer and industrial electronics. The MAX6366LKA29+ is a supervisor with a 3.3V power supply voltage, 1-LED indication, and provides a 0.5 second reset delay.

Application Fields

The MAX6366LKA29+ can be employed in a variety of consumer and industrial electronics, including STB/Set-Top Box, HDTV and Smart TVs, Networking Equipment, Home Appliances, and Industrial Automation Products. It is designed to guarantee a safe and reliable POR, and is well suited for cost-sensitive consumer products, such as STB/Set-Top Box.

This supervisor is also ideal for industrial and automation applications that require a reset delay, such as industrial LCDs, large displays and other industrial automation equipment. Its low supply current and wide supply voltage range also make it suitable for a variety of 5 V low-power embedded systems.

Working Principle

The MAX6366LKA29+ has an internal 0.5-second delay before triggering a reset, which can be adjustable by changing an external capacitor. This delay is important because it ensures that the system has stabilized in the start-up phase. After the voltage rises above the factory-set 3.2V, the IC will wait for a chosen time, and if the voltage does not reach the specified minimum operating voltage (MOV) threshold within that time, it will assert the RESET output.

The supervisor also has an active-low, open-drain rST output. This output is designed to pull active-low RESET low immediately (within 10µs) when the supply voltage (VCC) drops below the power-on reset voltage (POR) threshold. This prevents the system from entering a non-operational state due to an unwanted drop in VCC due to intermittent power supply interruptions.

On the other hand, if the voltage stays above the POR threshold, the RESET output will remain high and the rST output will remain low. This supervisor is accurate and reliable, so it guarantees that the electronics powered by it will startup and remain in a safe and stable state.

Conclusion

The MAX6366LKA29+ is a supervisor IC with a 3.3V power supply voltage, 1-LED indication, and 0.5 second reset delay. Its wide supply voltage range, low supply current, and various features make it be perfect for a variety of consumer and industrial electronics, such as STB/Set-Top Box, HDTV and Smart TVs, Home Appliances, Networking Equipment, and Industrial Automation Products. By providing an adjustable delay and an active-low open-drain rST output, it ensures that the system is safe and stable when it is powered up or reset.