BD4859G-TR Integrated Circuits (ICs)

Power management integrated circuit (PMIC) is an essential component in today\'s electronics. It enables efficient, safe, and reliable powering of a range of electronic devices. Supervisors are a type of PMICs that can be used to monitor conditions on various power rails, systems, and components and enable safe, reliable operation of the system. In this article, we will discuss the application fields and working principles of BD4859G-TR, a supervisor IC manufactured by Rohm Semiconductor.

BD4859G-TR is a single-phase voltage supervisor that monitors the voltage on one particular power rail, pin, or component. It incorporates a reset generator, a comparator, a delay timer, and an output driver, enabling the supervisor to detect situations wherein the power rail, pin, or component drops below, or rises above, a preset threshold. It is designed to operate with a 4.5 V to 5.5 V voltage range and can support a maximum current of 1.2 A.

BD4859G-TR can be used in a wide range of applications, including battery monitoring systems, DC-DC converters, power supply systems, and embedded systems. In battery monitoring systems, it can be used to monitor the voltage of a lithium-ion cell and detect its voltage variations. In DC-DC converters, it can be used to detect undervoltage and overvoltage conditions. In power supply systems, it can be used to detect load faults, short circuits, and other conditions that may affect the system. In embedded systems, it can be used to detect system resets and to detect temperature variations.

The working principle of BD4859G-TR is based on a comparator circuit. The comparator compares the voltage at its input pins to a preset voltage reference level, which is typically set equal to the desired voltage threshold. When the input voltage falls outside of this range, the comparator output shifts to a high voltage level, which triggers the reset generator, delay timer, and output driver. The reset generator generates a reset signal, the delay timer adds a fixed amount of delay time to the reset signal, and the output driver drives the reset signal to the monitored device.

In addition to these basic components, BD4859G-TR also contains several other features, such as a digital soft-start function and an open-collector output driver. The digital soft-start function increases the system startup time and prevents sudden current fluctuations. The open-collector output driver provides a low-side control signal for external power sources, allowing for easier system integration.

BD4859G-TR is an ideal solution for applications requiring a reliable, efficient, and cost-effective voltage supervisor. It integrates all the necessary components into a single IC, making it easy to integrate into a variety of power supply systems, embedded systems, and other applications.