MCP131-450E/TO

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PMIC (Power Management Integrated Circuit) - Supervisors are widely used as chips featuring Voltage Monitoring and Reset functions. Among them, MCP131-450E/TO is a typical supervisor IC whose application and working principle will be discussed in this article.

MCP131-450E/TO is a low-power CMOS (Complementary Metal Oxide Semiconductor) supervisor which integrates Brown Out Detector (BOD), System Reset and watchdog timer into one chip. The BOD uses an analog comparator to detect an output voltage drop lower than a programmed threshold voltage. Particularly, the BOD of this supervisor can detect a drop as low as 1.3V and operate over a wide voltage range from 1.3V to 4.5V at a supply current of less than 600nA. The System Reset is designed with a push-pull output which is triggered to low level whenever the BOD detects an undervoltage. To prevent the system reset from being falsely triggered, a timeout period is set in the watchdog timer which generates a reset pulse with a scan period of 2.5 ms to 15.4 sec.

MCP131-450E/TO supervisor is mainly used in battery-operation and power-supplied products whose operation is under very critical conditions, such as smart phones, Tablet PCs, using Li-on batteries, and PDAs (personal digital assistants). It also provides device monitoring in power system, etc.

The working principle of MCP131-450E/TO can be explained as follows. When the system starts to run, the voltage at the input pin will detect by the BOD and compare to the programmed threshold. If the voltage is lower than the threshold, the user-programmed System Reset will be activated and the integrated watchdog timer will be enabled. Afterward, there will be regular pulses generated to make sure the system is stable. If the output voltage drops below the selected threshold for a certain period of time, the reset signal will keep its low level, otherwise, reset will be released and the system will recovery.

In this way, with an internal supply current less than 600nA, MCP131-450E/TO is capable of providing a high accuracy and reliable reset and monitoring over a wide voltage range from 1.3 to 4.5V. The dimensions of MCP131-450E/TO is small, allowing for space-saving designs. Furthermore, it features an excellent protection for product design to prevent against voltage malfunction or unexpected shutdown.

In conclusion, MCP131-450E/TO is a typical Voltage Monitor and Reset IC among PMIC – Supervisors. Its application field covers wide areas such as battery-operation and power-supplied products, system monitoring, etc. It is designed with an excellent protection against voltage malfunction, small size and low power consumption. Its working principle is simple, BOD detecting an output voltage drop less than a programmed threshold voltage and then System Reset being triggered to low level.

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