NCP305LSQ36T1

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PMIC - Supervisors is an application field that focuses on areas of power management, controlling, monitoring and protection available to the modern electrical engineer. A power system supervisor is a device that monitors and manages components to ensure that the application system or subsystem is operating in an optimal state.

The NCP305LSQ36T1 is a low drop-out voltage supervisor that is specifically designed for battery-powered applications. It provides high accuracy and fast response time coupled with low power-on reset threshold capabilities. In addition, it features wide temperature operation range, wide operating voltage range and low current requirements.

The NCP305LSQ36T1features two comparators, one for power-on reset and one for battery monitoring. The power-on reset comparator keeps the output in the reset state until the voltage on the VDD pin goes above the reset threshold. The battery monitor comparator monitors the voltage on the BAT pin and can trigger an active reset output if the voltage drops below the threshold set by the BAT resistor network. It also has an SPDT alarm output that can be setup with either a logic high or logic low or with a pulse width modulation (PWM) output.

The NCP305LSQ36T1 automatically begins monitoring both the VDD and BAT pins and puts the reset output in the reset state if either of the comparator thresholds are met. It has an active-high reset output and an active-low interrupt output that can be used to track the system and battery activity. With its features, the NCP305LSQ36T1 is ideal for applications that need to keep track of multiple power supplies, such as for industrial, automotive and consumer applications.

The working principle of the NCP305LSQ36T1 is straight forward. The power-on reset comparator monitors the VDD pin and will keep the reset output in the reset state until the VDD rises above the reset threshold. Once the VDD voltage reaches the threshold, the reset output will be de-asserted and the device will begin monitoring the BAT pin. If the voltage on the BAT pin drops below the threshold set by the BAT resistor network, the reset output will be asserted again and the device will enter back into the reset state.

The NCP305LSQ36T1 also has a hysteresis option that can be enabled by connecting the HYST pin to ground which ensures that during power-on, the reset output remains asserted until the VDD voltage rises above the VDDhyd pin voltage. The hysteresis option prevents the reset signal from "bouncing" and causing false alarms.

In summary, the NCP305LSQ36T1 is a highly versatile low drop-out voltage supervisor, specifically designed for battery-powered applications. It is capable of providing power-on reset, battery monitoring and SPDT alarm output and has a wide temperature range, wide operating voltage range and low current requirements. It is ideal for applications that need to keep track of multiple power supplies, such as for industrial, automotive and consumer applications.

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