NCP301LSN34T1G

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PMIC, or power management integrated circuits, are semiconductor devices that manage the power delivery to electronic systems, rebalancing the loads and consolidating multiple regulator functions and power supply control into a single component. Supervisors are a subset of PMICs which provide a “watchdog” for overvoltage and undervoltage trip points (and associated reset output), thus providing a failsafe for production and operation. The NCP301LSN34T1G is a Voltage-Detection Supervisory IC designed by ON Semiconductor, and is a cost-effective solution for protecting against unintended supply situations providing both manual reset functionality and basic power-on reset functions.

Application Field

The NCP301LSN34T1G is specified to function across a wide operating temperature range of -40°C to +125°C. It has an ultra low operating current of 2μA or less with a supply voltage of 2.1V Thus, it enables efficient power supplies and extended battery life, making it ideal for applications such as;

• Industrial Control Systems
• Automotive systems
• Home Appliances
• Consumer Electronics
• Automated Test Equipment
• Specialized Battery-Powered Equipment
• Instrumentation

Working Principle

The NCP301LSN34T1G is an open drain reset generator that provides a reset output that is active low and will remain active low until the voltage rises above the predefined trip point. An internal battery backup switch allows the voltage sense pin to be connected to a stable reference voltage while the power is off.

The reset output is generated using an internal comparator with an ultra low supply current that is written to a reset flip-flop. The reset flip-flop will remain set (reset output active low) until the voltage at the voltage sense pin rises above the predefined trip point. If the voltage falls below the trip point again, the reset output will return to the active low state.

The NCP301LSN34T1G also offers manual reset functionality. When the manual reset pin is taken to a high logic level, the reset output will be reset and the device will continue to monitor the voltage levels as normal. Once the manual reset pin is returned to a low logic state, the monitored voltage will be checked and the reset will be driven low indicating a reset condition if the supply voltage is below the predefined trip point.

The NCP301LSN34T1G also offers a VDD monitoring pin. When power is applied to the device, the VDD monitoring pin allows for monitoring of the VDD voltage level and only once the voltage is within the specified acceptable levels is the reset pin released. This prevents any unwanted system behavior resulting from incorrect power being applied to the device.

Conclusion

The NCP301LSN34T1G is a highly robust Voltage-Detection Supervisory IC, suited for a wide range of applications from Industrial Control Systems to Automotive systems and Home Appliances. It offers ultra low operating current and voltage threshold trip points, manual reset and power-on reset circuit functions, while also offering VDD monitoring protection against unintended power application. All these features combine to create an effective protection system for the applications in which it is used, creating a failsafe for both production and operation.

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