The LM3420AM5-16.8 is a micropower undervoltage sensing circuit manufactured by National Semiconductor (now Texas Instruments). It is designed to monitor a voltage and provide an active low reset signal when the voltage falls below a specified threshold. The LM3420AM5-16.8 is specifically designed for monitoring 16.8V supplies. It's useful for protecting battery-powered devices or ensuring proper operation in systems with voltage fluctuations.

Applications:

• Undervoltage detection
• Battery monitoring
• Power supply monitoring
• Microcontroller reset circuits
• System power management

Features:

• Precision undervoltage detection
• Micropower operation
• Active low reset output
• Hysteresis
• Small SOT-23 package

Benefits:

• Protects against damage or malfunction due to low voltage conditions.
• Extends battery life in portable applications due to low power consumption.
• Provides a reliable reset signal to microcontrollers and other digital circuits.
• Prevents oscillations and false triggering with built-in hysteresis.
• Saves board space with a small SOT-23 package.

Additional Details:

The LM3420AM5-16.8 undervoltage sensing circuit provides a reliable and accurate way to monitor voltage levels in electronic systems. Its micropower operation makes it suitable for battery-powered applications where power consumption is a critical concern. The active low reset output can be directly connected to the reset input of a microcontroller or other digital circuit, ensuring a proper reset sequence when the voltage falls below the threshold. The built-in hysteresis prevents oscillations and false triggering caused by noise or voltage fluctuations. National Semiconductor, now part of Texas Instruments, is a reputable manufacturer of high-performance analog and mixed-signal integrated circuits. Specifically, this part number is meant to trigger a reset when the voltage falls to 16.8V, making it useful for monitoring multi-cell battery packs.