TPS3707-50DG4

Introduction to TPS3707-50DG4

The TPS3707-50DG4 is an IC from Texas Instruments, designed to provide a highly accurate voltage supervisor used to detect under-voltage (UV) or over-voltage (OV) conditions in electronic systems. It is part of the supervisor family in the PMIC (Power Management Integrated Circuit) series.

Its features include an ultra-low quiescent current of 2 μA with delay of up to 100 ms, integrated programmable reset thresholds and two open drain reset outputs for dual reset feedback. It is applicable in various systems such as notebook/tablet computers, motherboards, modems, appliances, and home automation.

Application Fields and Working Principle of TPS3707-50DG4

Application Fields

This voltage supervisor is suitable for communication, consumer, industrial, and automotive applications where accurate reset is required. Examples include notebook/tablet computers, motherboards, modems, appliances, and home automation. Other applications involve integrated circuit board protection, microcontroller reset, NVRAM protection and power supply monitoring/control.

Working Principle

The working principle of TPS3707-50DG4 is based on monitoring the load voltage. The load voltage is compared to an internal Reference input that has been programmed. When the load voltage drops below the programmed voltage, the device will pull its two open drain outputs low. The inputs and outputs of this chip are designed to operate at 3.0V to 5.5V and it has a hysteresis of 0.1V to 0.9V, adjustable with external resistor, to improve noise immunity.

The operation of this device is fairly straightforward. It monitors the voltage of the load and outputs an active-low reset signal if the voltages falls below the preset levels. It has two open-drain outputs; RESET (RESETB) and RESET# (RESET), which can be used to provide dual feedback when the reset is engaged. In addition, the device has an internal pull-up resistor of 24K in RESET pin.

The device has an adjustable delay which is used to prevent spurious resets. A capacitor is connected between the DELAY pin and ground to externally adjust the delay time by choosing the appropriate capacitor value.

Summary

In summary, the TPS3707-50DG4 is a voltage supervisor from Texas Instruments, designed to provide highly accurate reset for communication, consumer, industrial, and automotive applications. The device operates by monitoring the load voltage, and provides two open drain outputs (RESET and RESET#) that can be used to provide dual feedback when the reset signal is engaged. It has an adjustable delay to prevent spurious resets and has an ultra-low quiescent current of 2 μA with delay of up to 100 ms.