NCP305LSQ40T1

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PMIC – Supervisors are integrated circuits that are designed to simply monitor a system’s power rails and alert if any kind of irregularity is sensed. NCP305LSQ40T1 is one such PMIC – Supervisor IC from ON Semiconductor and it is widely used for monitoring of a system’s power rail. This application note explains the application field and working principle of NCP305LSQ40T1.

Application field

The NCP305LSQ40T1 voltage supervisor is a low power, precision power-on-and-off reset circuit. This IC has been designed to be used in applications such as load switch monitoring, logic power supply sequencing, and supervisory functions in programmable logic devices, microprocessors and logic families. This IC can be used in many electronic applications such as automotive, industrial and consumer electronics. Its versatile design allows it to be used in applications where a low start-up current/reset circuit is necessary.

Working Principle

The NCP305LSQ40T1 voltage supervisor works according to a simple working principle – it senses the voltage of the power rails and if the voltage is at an acceptable level, it sends an “ON” signal to the system. When the sensed voltage drops below the acceptable level, an “OFF” signal is generated and the system is “reset”. It also provides power-on delay and power-off delay time as well as an output enable function. This IC has a voltage level detection range of +/-0.1% and a wide power on reset delay range of 1-2 seconds. It also has an in-built resistance network which is used to reduce the risk of variation due to power supply modulation.

The NCP305LSQ40T1 voltage supervisor also helps to protect against inrush current, as it has an over-current and over-voltage protection circuit. It also offers an additional power-off delay option, allowing the IC to provide an additional delay between the end of the power-on reset signal and the start of the power-off reset signal, which helps to reduce potential risk of system malfunction due to sudden loss of power.

The NCP305LSQ40T1 voltage supervisor is a precision, reliable, and cost-effective solution for powering and protecting applications. Its features make it suitable for a wide range of applications, from automotive and industrial to consumer electronics.

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