TPS3809I50DBVTG4

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 to TPS3809I50DBVTG4

TPS3809I50DBVTG4 is a low-voltage supervisor device, which belongs to Texas Instruments’ PMIC - Supervisors. It is a precise digital-data monitoring device which monitors critical power supplies and system functions.

Application Field of TPS3809I50DBVTG4

TPS3809I50DBVTG4 is designed for a wide range of self-supplied system applications such as cellular phone, personal digital assistants (PDA), digital cameras, and other hand-held products. It is particularly useful in applications requiring additional supply current parking, accurate VDD detection, and operation across a wide range of supply voltages.This supervisor device can be used for monitoring multiple supplies for safe shutdown of a system under out-of-spec conditions. It is also used for monitoring the supply and ground (VCC and GND) signals in Ultra Low Power (ULP) applications, such as medical and security systems and safety-critical systems.

Working Principle of TPS3809I50DBVTG4

TPS3809I50DBVTG4 is a two-pin supervisory circuit with a wide operating range and a single chip form factor. It is designed to detect a system power supply\'s VCC power supply voltage level. The device has a variety of features, including an adjustable over-voltage detector, an adjustable under-voltage detector, interrupt pin output, dual internal thresholds, and a low supply-current consumption.The supervisor device is composed of 2 pins, the VDD pin, which is the input power pin, and the ISEN pin, which is the IC\'s ground pin. When the VDD pin receives a voltage with a range from 1.87V - 5.5V, the IC enters the Supply Monitor Mode and the output signal state is determined by the voltage of the VDD pin in relation to the set threshold value.If the input voltage surpasses the highest threshold value, the device will initiate a power-on reset and its output signal would remain low until the voltage of VDD falls back to or below the highest threshold point. With this reset, the device is able to protect a system from damage due to overvoltage.The device also provides an adjustable under-voltage monitor that can detect when the input voltage drops below a certain value. When the input voltage drops below the undervoltage detection threshold, the device will trigger a power-on reset event and the output signal will remain low until the voltage of VDD rises back above the under-voltage threshold point. This reset feature provides additional protection from events due to low voltage conditions.

Conclusion

In summary, TPS3809I50DBVTG4 is a low-voltage supervisor IC, specially designed for self-powered systems such as cellular phones and PDAs. It monitors the supply and ground signals in Ultra Low Power applications and employs an adjustable over-voltage detector, an adjustable under-voltage detector, interrupt pin output, dual internal thresholds, and a low supply-current consumption in order to ensure the stable power supply to the system and protect it from over-voltage and under-voltage events.

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