MCP121-270E/TO

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Power Management IC (PMIC) Supervisors, such as the MCP121-270E/TO, are integrated circuits designed to perform supervision of multiple power rails and system power-on functions, allowing the monitoring of power rail and other system voltages and controlling the reset of power supplies and the power sequencing of several different voltage rails. Generally, an IC supervisor provides on-chip reset sources and/or other system control outputs.

The MCP121-270E/TO is a microprocessor supervisor with an adjustable voltage-fault monitor, an output disable function, power supply sequencing and glitch filter circuits. The device features an active-low reset output and three open-drain outputs, four digital input comparators, two reset delay inputs, an adjustable brown-out detect (BOD) threshold, a power-on reset (POR) threshold and a timer to ensure a minimum reset delay. The supervisor also has a POR timer and a Watchdog Timer (WDT) to provide coverage of monitoring system activity. In addition, the device provides a POR temperature monitor to protect against extended power supply operation during periods of elevated temperatures.

The MCP121-270E/TO is mainly used for systems with multiple voltage rails and/or power supplies. This IC supervisor provides a 2.7V to 5.5V tolerance range and can monitor up to four system voltages. It also provides adjustable BOD voltage detection and output sequencing, configurable reset delay, open drain outputs or active output, adjustable watchdog timer and system temperature monitor.

The supervisor can be used in a variety of application fields, from consumer electronics to automotive. Its main applications include handheld consumer electronics (e.g. cellphones and PDAs), PC motherboards, automotive electronics, power supplies and other smart embedded systems. The built-in temperature monitor makes it suitable for systems requiring high reliability, such as medical and avionic electronics.

MCP121-270E/TO provides on-chip power-on reset (POR) and adjustable voltage-fault detection using internal voltage reference. It measures and compares the input voltage by subtracting the voltage reference from the voltage on the external supply and trips an output signal when it is lower than the predetermined value. It also has the ability to delay the reset signal for a predetermined time interval in order to provide time for power supplies to stabilize. The time interval may vary depending on the supply voltage.

The MCP121-270E/TO also provides power supply sequencing and glitch filter circuits. Output sequencing allows for the output voltage level of each voltage rail to be adjusted in order to control the power-up sequence of the load. Glitch filter circuits prevent short-term voltage fluctuations from triggering a reset signal. This ensures that the system can remain stable and properly functioning in the event of supply voltage fluctuations.

The MCP121-270E/TO, then, can be used as an all-in-one IC supervisor, integrating all the necessary components to monitor and control various power-related aspects of embedded systems. It offers a complete solution for power supply monitoring and fault detection, providing flexible configurations to match each system’s requirements as well as adjustable reset delay and power supply sequencing.

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