NCP304LSQ33T1G

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The NCP304LSQ33T1G from ON Semiconductor is a low temperature soldering (O 260°C/60 sec) 3-pin circuit protect SmartZip SOT-23 voltage supervisor device. This device offers precision voltage detection, guaranteed start-up into either 5V or 3.3V, and undervoltage lockout (UVLO) thresholds. Typical applications of NCP304LSQ33T1G include systems requiring active power management, real-time clock (RTC) systems with or without battery backups, battery operated systems, 3.3V powered systems, peripheral management with sequencing of power supplies, DSP and port processor system power management, logic level shifting, and many other control IC applications such as system reset systems, power station monitoring, battery conditioning, switches and LEDs control.

The NCP304LSQ33T1G is a small, low-power voltage supervisor device designed to detect out-of-tolerance supply voltages and help minimize system initialization time and power consumption. With its low quiescent current and high accuracy threshold detection of 2.8V to 4.6V (5V supply) and 1.8V to 3.5V (3.3V supply), the NCP304LSQ33T1G serves as an efficient, smart voltage supervisor fault protector in a variety of systems. The device is designed to be used in systems requiring active power management, such as real-time clock (RTC) systems requiring both 3V and 5V power supplies, battery operated systems, and logic level shifting.

The working principle of the NCP304LSQ33T1G is fairly simple. The device offers voltage sense pins that can be connected directly to the power supplies providing essential power regulation and fault detection requirements. This device monitors the input voltage and if this voltage falls below or above the specified thresholds, the device latches-off the output and maintains it in the low state, thus allowing the microcontroller to detect a system fault or error condition and take appropriate corrective action. With a hysteresis of 170mV at the output, the NCP304LSQ33T1G can ensure proper device operation in noisy environments and at varying temperatures. The device’s active high output and dual-supply operation are designed to reduce the time needed to re-assert the device’s output once the reset event is cleared.

In addition to undervoltage detection and latching off protection, the NCP304LSQ33T1G can also be used to provide power-on reset (POR), undervoltage lockout, and overtemperature protection. Its UVLO feature provides state-of-the-art protection, allowing the system to remain in reset until the supply voltages return to their nominal values, thus preventing system malfunction due to brownouts. The device also features an overtemperature protection that shuts-off the device to prevent damage due to system overheating.

The NCP304LSQ33T1G has proven to be a valuable tool for microcontroller application systems with accuracy, fast response time, and low quiescent current. Its wide input range and low power consumption makes it an ideal choice for a wide range of applications and allows the user to precisely monitor the supply voltage of the system and detect any unusual conditions at various levels. This device can be used in systems ranging from automotive to industrial and consumer applications due to its high level of accuracy and robust protection.

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