X40421S14-AT1

The X40421S14-AT1 is a microcontroller supervisor from the PMIC (Power Management Integrated Circuit) Supervisors family. It is designed to protect digital systems from overvoltage, undervoltage, and power system faults. The device monitors the supply voltage and provides a reset output in response to a voltage fault. It also provides an output when the input supply voltage is within specification.

Features

• Wide operating voltage range: 2.7 V to 5.5 V with ± 10% overvoltage and undervoltage protection
• High reset thresholds: 4.2 V and 5 V
• Low reset threshold: 2.5 V
• Low supply current: 1.5 μA
• High accuracy: ±0.75%
• Low power-on-time detector: 140 μs
• Small package size: SOT23-6 small surface-mount package

Application field

The X40421S14-AT1 is an ideal solution for monitoring the supply voltage in battery-powered and mobile applications, where cost and power consumption are major considerations. With its wide operating voltage range and low supply current, it is suitable for monitoring battery/charge circuits, Li-ion battery cell start/stop levels, and battery voltage undervoltage levels. It is also suitable for any other application where the supply line has to be monitored and controlled.

Working principles

The X40421S14-AT1 uses a bandgap reference, comparator, and MOSFET (transistor) circuit to monitor the supply voltage. When the monitored supply voltage exceeds the upper threshold of 5V or drops below the lower threshold of 2.5V, the device generates a reset output. This reset output can be used to reset or shut down the system to prevent it from malfunctioning due to overvoltage or undervoltage conditions. It also has an open-drain output (OP-OUT), which can be used to generate an interrupt signal when the supply voltage is within the predefined range. The device also has a low-power-on-time detector, which enables the reset output to remain asserted for a minimum specified time after power-up, regardless of the power supply voltage.

The X40421S14-AT1 provides excellent tolerance to transient voltages, making it suitable for use in noisy power environments. It is available in a small 6-pin SOT23-6 surface-mount package, which makes it easy to integrate into tight circuit board designs. Lastly, the device is offered in extended temperature range, which makes it ideal for use in industrial, automotive, and outdoor applications.

Conclusion

In conclusion, X40421S14-AT1 is an ideal solution for applications where supply voltage monitoring and protection are required. It offers excellent performance and is available in a small, low-cost package that makes it easy to integrate. The device is designed to protect digital systems from overvoltage, undervoltage, and power system faults, and provides an output when the input supply voltage is within specification.