LP3470M5-4.00/NOPB

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Power Management Integrated Circuit (PMIC) is a device that helps manage power in a variety of electronic products. The Texas Instruments LP3470M5-4.00/NOPB is a family of Power Supply Supervisors (PSS) designed to accurately monitor multiple power supply lines, interpret the data and trigger a reset or other action if any of the supply lines deviate from predetermined settings. This application field and working principle will be addressed thoroughly in this article.

Application Field

The LP3470M5-4.00/NOPB is applicable in a variety of settings such as industrial, consumer, and automotive electronics as well as medical and telecommunications. This family of Power Supply Supervisors works within a supply voltage range of 2.5 to 5.5 Volts and temperature range of -40 to 85C. The LP3470M5-4.00/NOPB family provides monitoring of multiple power supply voltage lines with a three-level sampling system, ensuring maximum measurement accuracy. This ensures that the supply line is properly monitored if there is any fluctuation in voltage or current, taking pre-ventative measures to protect the device’s components and to ensure quality performance.

Working Principle

The LP3470M5-4.00/NOPB PSS family is composed of two integrated circuits, a voltage supervisor and a watchdog timer. The voltage supervisor monitors the supply voltage of the system for undervoltage, overvoltage, and power loss conditions via the three-level sampling system. The voltage supervisor outputs a reset signal and interrupts a connected A/D converter or a microprocessor if any of these conditions are detected, thus maintaining system stability. The watchdog timer is designed to ensure the integrity of control and timing elements in the system. The watchdog timer has the ability to detect if the system has stopped or stalled, namely if the microprocessor or an A/D converter has dropped to an idle or stopped state, and will generate a reset signal to restart the system.

The LP3470M5-4.00/NOPB PSS family utilizes two pins to control the watchdog timer; a Trigger Enable (TENA) pin that enables and disables the watchdog, and a Watchdog Pulse (WD) pin that periodically resets the timer depending on the set time interval. When the pulse comes through the WD pin, the system will reset the reset timer. If the TENA pin is set to the low logic state, the timer will be disabled and will not be triggered by either the WD pin or timeout of the reset timer. The LP3470M5-4.00/NOPB PSS family includes an internal voltage comparator that is used to detect if the voltage in the system has gone above or below a predetermined threshold. If either of these conditions is detected, the voltage supervisor will trigger the reset signal.

The LP3470M5-4.00/NOPB PSS family is designed with integrated level shifters to facilitate communication between multiple voltage domains. It also offers protection against overcurrent and over temperature conditions, thus further enhancing the safety of the system.

The LP3470M5-4.00/NOPB PSS family is well-suited for many various electronic systems, providing accurate monitoring of multiple power supply voltage lines and providing timely reset signals to ensure the stability of the system. In addition, its integrated level shifters provide communication between multiple voltage domains, and its protection against overcurrent and over temperature conditions add an extra layer of protection.

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