BD4742G-TR Integrated Circuits (ICs)

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Power Management Integrated Circuits (PMICs) are key components in many design applications, providing an efficient, cost-effective way to ensure a reliable supply of power. The BD4742G-TR is an example of a PMIC for Supervisors. This article will discuss the application fields and working principle of this device.

BD4742G-TR Overview

The BD4742G-TR is a 4-channel power management IC (PMIC) supervisor with built-in power supply monitoring and system reset function. It supports the power management of four power sources (VCC1 to VCC4) with different voltage regulators and reference voltages. It is designed for system supervisors in general applications such as embedded systems, telecommunications equipment, automotive and medical systems.

Equipped with an internal reset circuit, it detects 8 types of power supply monitoring conditions and performs a system reset when the internal reset circuit is triggered. It also has an in-system programmable reset delay time of up to 8 seconds.

Application fields and working principle

The BD4742G-TR is a voltage supervisor with two main application fields. One is power supply monitoring, as the device is able to detect 8 types of power supply monitoring conditions and perform a system reset when the internal reset circuit is triggered. This helps to ensure reliable power delivery and signal output. The second is system reset, in which the device can generate reset signal with a maximum delay of 8 seconds. This helps to better protect the power supply and system from abrupt power failure and improve the system\'s stability.

The device is based on a hysteresis comparator with a fixed reference voltage to monitor the power supply. The hysteresis comparator acts like a switch, designed to open and close in response to the input voltage. When the input voltage exceeds the reference voltage, the comparator goes from the "open" state to the "closed" state, and when the input voltage falls below the reference voltage, the comparator goes from the "closed" state to the "open" state. This cyclic switching of the comparator is used to control the system reset signal.

When the power supply is monitored, the BD4742G-TR monitors the input voltage according to the set threshold and will generate an internal reset signal when the voltage exceeds the threshold. The reset signal is output to the system reset pin and the system is reset if the voltage threshold is exceeded. The internal reset can also be programmed with a delay timer, which delays the reset signal if the voltage threshold is exceeded. The delay timer helps to reduce the number of false reset by allowing the system to adjust the voltage back to acceptable levels before resetting the system.

The BD4742G-TR is designed for applications that require reliable and robust power supply, such as embedded systems, telecommunications equipment, automotive and medical systems. It is a cost-effective solution for providing reliable power monitoring and system reset functions. The device\'s internal reset is triggered by the power supply and is easily programmable via the delay timer, making it an ideal choice for applications that require reliable and robust power management.

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