BU4832G-TR

A power management integrated circuit (PMIC) is a device that combines multiple power handling circuits such as voltage supervisors, voltage regulators, current regulators, power switches and power regulation logic into a single packaged unit. Supervisors, or supervisor ICs, are an important part of PMICs and require special attention to understand and select. This article will provide a comprehensive look into the features and applications of one type of voltage supervisor, the BU4832G-TR, and explain its working principle.

Introduction to the BU4832G-TR - a Voltage Supervisor IC

The BU4832G-TR is a voltage supervisor IC manufactured by ROHM Semiconductor. It is an ultra-low power, ultra-low voltage chip that is designed to monitor and detect the power supply rail of systems designed to operate on very low voltage power supplies. It is capable of measuring supply voltages up to 15V, and can handle an input voltage range of 1.5V to 9V. The chip is specifically designed to operate with a tight supply voltage tolerance, making it ideal for monitoring and controlling the power supply of low voltage systems. It is also designed to function in any orientation, with both temperature and humidity tolerance.

Features and Benefits of the BU4832G-TR

The BU4832G-TR is a fully integrated voltage supervisor IC that offers several features and benefits, such as:

• Adjustable voltage threshold: The BU4832G-TR has an adjustable voltage threshold with a range of 1.25V to 5V. The adjustable threshold allows for optimal power supply performance. It also prevents false triggering at the other power supply rails.
• Low current consumption: The chip has very low current consumption, allowing it to be used in battery-powered applications.
• Powered-down reset: The BU4832G-TR has a powered-down reset circuit that is able to detect power loss and reset the system accordingly. This prevents the system from hanging and keeps it in a safe state during power down.
• Tri-state outputs: The BU4832G-TR has two tri-state outputs, which allows different signals to be sent when the power supply voltage is above or below the threshold voltage.

Applications of the BU4832G-TR

The BU4832G-TR is a versatile voltage supervisor IC that can be used in a variety of applications, including:

• Battery operated device: The BU4832G-TR can be used in battery powered devices such as mobile phones, laptops, and tablets. Its low power consumption and adjustable voltage threshold makes it ideal for monitoring and controlling the power supply of battery-powered devices.
• Wearable and portable devices: The low power consumption and flexibility of the BU4832G-TR make it well-suited for use in wearable and portable devices, including watches, pedometers, and hearing aids.
• Portable health monitoring devices: The BU4832G-TR can be used in portable health monitoring devices such as blood pressure monitors, glucose monitors, and heart rate monitors. Its low power consumption, adjustable voltage threshold, and tri-state outputs make it an ideal choice for these applications.
• IoT devices: The BU4832G-TR can be used in IoT devices such as smart thermostats, security systems, and home automation systems. Its low power consumption and adjustable voltage thresholds make it suitable for these applications.

Working Principle of the BU4832G-TR

At its core, the BU4832G-TR is a comparator circuit. It has an input voltage and a reference voltage. The chip compares these two voltages and outputs a logic signal reflecting the difference between them. The input voltage can be set to any voltage within the chip’s range. The reference voltage is set using a resistor divider. When the input voltage is below the reference voltage, the chip outputs a logic low signal. Conversely, when the input voltage is above the reference voltage, the chip outputs a logic high signal.

This feature of the BU4832G-TR is used for two purposes. First, it can be used to detect when the power supply voltage drops below a certain threshold and send a signal to the system, which can then take appropriate action. This prevents system hangs or crashes that can be caused by power loss. The second purpose is to detect when the voltage rises above the threshold and send a signal to the system, which can be used to turn the system on or activate certain functions.

Conclusion

The BU4832G-TR is an effective voltage supervisor IC designed to monitor and control the power supply of low voltage systems. Its adjustable voltage threshold, low current consumption, powered-down reset circuit and tri-state outputs make it an ideal choice for a variety of applications, ranging from battery-powered devices, wearable and portable devices, portable health monitoring devices, and IoT devices. Its working principle is based on a comparator circuit, where the input voltage is compared against a reference voltage. This feature enables the chip to detect when the power supply voltage drops below or rises above a certain threshold and send a signal to the system accordingly.