TPS3850G18QDRCRQ1

The TPS3850G18QDRCRQ1 is a voltage supervisor device, which can monitor the voltage levels of an application to ensure proper system power-up and power-shutdown operations. It is a part of the Supervisors family which is a type of PMIC (Power Management Integrated Circuits).

The TPS3850G18QDRCRQ1 comes in a 4-pin package and provides voltage supervisory functions for applications that require precise power-up and power-down timing. It is a low-power device, usually drawing only 0.75 µA from a 5V power source. The device also has a reset active-low output that activates when the voltage drops below the preset threshold. The threshold voltage can be adjusted through an external resistor and capacitor network.

The device can be used to monitor the input voltage of a processor core or other high value power rail, such as +3.3V, +1.8V, or +1.2V. The power rail voltage can be monitored using a resistive divider operating on the same reference voltage as the output rail. The programming of the device is done using an external resistor-capacitor (RC) network, and the reset output is enabled when the programmed threshold voltage is dropped by more than 1.5V or when the power input voltage is lower than the internal 1.3V comparator threshold. This is designed to ensure that the output does not switch on too soon when the voltage drops, thus providing for improved accuracy of the reset operation.

For a basic level of protection, the TPS3850G18QDRCRQ1 can be used to assert a reset signal when the input voltage falls below the adjustable threshold, ensuring that the processor core or power rail voltage does not drop to a level where it can cause damage to the system. The voltage supervisor can also be used to detect a power supply failure, as the reset output will be activated when an input voltage dip is detected that is greater than the programmed threshold.

The device also has a “tolerant” feature which allows it to tolerate supply voltage dips down to 1.5V below the programmed threshold before triggering the reset output. This feature adds additional protection in the event of temporary voltage spikes, as the reset output will remain inactive until the dip extends beyond the 1.5V limit.

In addition to these features, the device also contains circuit protection such as an active-low power good signal, a push-pull output, and a reset timer to ensure that the processor does not remain in a reset state for an indefinite amount of time. The reset timer is programmed using an external RC network, and the reset output remains asserted for a period between 100ms and 200ms after the input voltage reaches the programmed threshold.

In summary, the TPS3850G18QDRCRQ1 is a voltage supervisor device which is designed to protect processors and other high value components from damage due to too-low input voltages. It contains features such as an active-low power good signal and reset timer, as well as a “tolerant” feature which allows it to tolerate voltage dips of up to 1.5V below the programmed threshold before triggering the reset output. The device is programmable using an external RC network, and is able to detect drops in the input voltage that are greater than the programmed threshold.