TPS3809I50DBVR

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Push-Pull, Totem Pole
Reset:	Active Low
Reset Timeout:	120 ms Minimum
Voltage - Threshold:	4.55V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	SOT-23-3
Base Part Number:	TPS3809I50

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Introduction

TheTPS3809I50DBVR is a low-power microprocessor (MPU) power supervisory device that provides a quick response to fault conditions, including undervoltage, overvoltage and overcurrent. It features three independent power-on reset circuits, an analog-controlled reset (A/C RST) circuit, an adjustable watchdog timer, an undervoltage lockout function, and a temperature supervisor function.

Application Field

TPS3809I50DBVR is a multi-function supervisory and reset IC designed to protect and monitor power controllers such as buck converters, linear regulators, and hot swap circuits, or any other system requirements with an overvoltage, undervoltage, overcurrent, thermal, or power-on reset needs. It is widely used in industrial, automotive, and consumer electronic applications, such as MPU circuits, micro-controller boards, laptop PCs, battery chargers, data centers, and telecommunications systems.

Working Principle

The TPS3809I50DBVR device operates in three stages. In the first stage, low-voltage reset (LVR) and A/C RST enable protection against overvoltage and undervoltage faults. The device is configured with an integrated voltage comparator, which compares the external voltage to the internal voltage internally. When the external voltage falls below the threshold, the device triggers an undervoltage event, forcing the power state off until the voltage is restored. Similarly, if the external voltage is higher than the threshold, the device triggers an overvoltage event, forcing the power state off until the voltage is restored. The second stage of the device\'s operation is its watchdog timer. This timer monitors the system for abnormal behavior. If no updates or signals are received from the system over a specified period of time, the watchdog timer forces a reset of the system, allowing the system to reset and resume normal operation.The third stage of the device\'s operation is its temperature supervisor. The temperature supervisor monitors the system temperature and responds to temperatures outside of the specified temperature range. If the temperature falls outside of the acceptable range, the temperature supervisor triggers a reset of the system, allowing it to reset and resume normal operation.

Conclusion

The TPS3809I50DBVR is a versatile and powerful supervisor IC, providing a wide range of protection and monitoring functions for various applications. It provides quick response to fault conditions, including overvoltage and undervoltage, as well as overcurrent conditions. Its watchdog timer and temperature supervisor functions ensure that the system remains within the expected boundaries for safe and reliable operation. The TPS3809I50DBVR is an ideal choice for any system that needs reliable power-on reset and protection capabilities.

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