MAX6388XS44D4-T

PMIC - Supervisors

Power management integrated circuits (PMIC) are integrated circuits that offer multi-regime power management solutions for modern electronic devices. PMICs are usually tailored to meet specific needs. One type, Supervisors, are designed to provide system power on or off, reset or monitoring of critical system functions. The MAX6388XS44D4-T Supervisor is an example of a PMIC supervisor.

Application Field

The MAX6388XS44D4-T Supervisor, is a low-power, low-noise supervisor, which works with both 3.3 V and 5 V CMOS designs. It provides system power-on control, reset management, and allows pushbutton control of system shutdown through the open-drain reset out pin. It is used in a wide variety of applications such as memory modules, notebook/laptop PCs, set-top boxes, gaming consoles, industrial controllers, and many more electric devices. It can be used in post-assembly testing, or to manage critical system events such as brownout conditions.

Working Principle

When the device is powered up, the supervisor (MAX6388XS44D4-T) first issues a reset signal to allow the system to initialize properly before it attempts any additional action. Subsequently, the supervisor issues another reset signal if a user presses the power button. This causes the system to power off rather than simply restarting it. The supervisor also monitors the voltage levels that are supplied to the system and will issue a reset signal if the voltage is too low. This can help to protect the system from wrong voltages which can cause hardware damage.

The MAX6388XS44D4-T supervisor has two comparators inside the device, whose outputs are compared with two reference voltages, VH and VL. If the output voltage is between these two volatges, then the HL output is high and the device is in normal mode operation. However, if the output voltage is lower than VL, the HL output goes low, indicating the supervisor has detected a low voltage condition. The supervisor will then issue a reset signal to try and protect the system from hardware damage.

In addition, the MAX6388XS44D4-T supervisor offers a pushbutton-controlled reset system. When the pushbutton is pressed, the reset output is activated and the system is reset. This can be used to shut down the system in an orderly manner, instead of having to physically disconnect the power supply or hard reset the device.

Conclusion

The MAX6388XS44D4-T supervisor is a power management integrated circuit designed to provide system power-on control, reset management, and pushbutton control-based shutdown of the system. It is used in a variety of applications, including memory modules, laptop/notebook PCs, set-top boxes, industrial controllers and gaming consoles. Its reset output ensures that the system is properly initialized before attempting additional actions, provides protection from low voltage conditions, and provides pushbutton based orderly shutdown.