XC6121D350MR-G

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PMICsupervisors are responsible for providing overvoltage, undervoltage, over current, and other protection devices to power supply systems. The XC6121D350MR-G is an example of this type of supervisor that is found in many modern electronics. This application note explains the basic functionality of the XC6121D350MR-G supervisor, as well as its typical applications and working principle.

Overview of XC6121D350MR-G Features

The XC6121D350MR-G is a low-cost, functional supervisor device that provides protection against overvoltage, undervoltage, over current and over temperature conditions. It provides an output signal that can be used to notify downstream systems of conditions that require attention. Up to two external voltage sources may be monitored. The thresholds are programmable by external resistors and/or by an I2C/SMBus interface. The device also integrates two internal linear regulators that provide ±80 mA of active load current and adjustable output voltage ranges from 1.212 V to 5 V.

The XC6121D350MR-G provides independent outputs for each monitored input. The outputs produce an active-high signal when an error condition is detected, allowing for proper signaling of conditions that require attention. The outputs are valid both in shutdown and active modes and remain active until cleared or cycled. An active-high enable input is available to allow the device to be completely disabled or enabled. Additionally, a watchdog timer monitors the integrity of the host system, and any input can be selected for monitoring for up to five additional monitored parameters.

Typical Applications

The XC6121D350MR-G is typically used in mobile phones, tablets, and other portable applications, where it is beneficial to have a supervisor device that is compact and cost-effective. The device is also ideal for PCs, servers, and other systems with many power supply components that require protection. Additionally, it is suitable for automotive applications that use power management systems.

Working Principle

The XC6121D350MR-G works by monitoring the power supply levels of two external inputs. When any input voltage falls out of range, or when an over-temperature condition is detected, the device will assert an active-high signal to the associated output. The outputs are valid both in active and shutdown modes. The device can be enabled and disabled as needed, and a watchdog timer is also provided to monitor the integrity of the system.

The XC6121D350MR-G also includes two internal linear regulators with adjustable output voltage ranging from 1.212 V to 5 V. The regulators can be used for up to ±80 mA of active load current and are ideal for providing consistent and stable power to sensitive logic and analog circuits.

Conclusion

The XC6121D350MR-G is a low-cost, functional supervisor device that provides overvoltage, undervoltage, over current and over temperature protection. It is typically used in mobile phones, tablets and other portable applications, and it is also suitable for PCs and servers. The device integrates two internal linear regulators, and it has an active-high enable input to enable or disable the device. Additionally, a watchdog timer is provided to monitor the integrity of the system.

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