BD4840G-TR Integrated Circuits (ICs)

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Power management integrated circuits (PMICs) have enabled enormous advances in reducing power consumption and increasing efficiency for systems and components. PMICs can reduce power usage, maximize battery life, and provide reliable system operation. The BD4840G-TR is a great example of the capabilities of a PMIC, and it is classified as a Supervisors device.

Supervisors provide a variety of functions, such as monitoring power supplies, detecting voltage droops, or resetting a system if an over-current or thermal event is detected. The BD4840G-TR has all of these features and more, enabling a wide range of applications.

BD4840G-TR Features

The BD4840G-TR is a highly integrated PMIC that combines many systems-level functions into a single device. Its features include:

• Two power supply voltage monitors, with selectable reset thresholds
• Programmable reset delay time
• Power supply monitoring range 0.9 to 5.5 V
• Software disable/enable of reset output
• Digital reset and manual reset input signals
• PMU power supply monitoring
• Over-voltage detection and circuits for protection
• Symmetrical and non-symmetrical over-current detection

The BD4840G-TR is designed to provide reliable system reset and monitoring of power supplies, with adjustable fields for specific applications. It is well-suited for power systems with multiple power rails, managing each rail\'s power usage and detecting over- or under-voltage events.

BD4840G-TR Working Principle

The BD4840G-TR operates by monitoring input power supplies and detecting when they enter an over- or under-voltage condition. The device can then send a reset signal to reset the system, protecting it from damage.

The device supports two power supply voltage monitoring channels. The first channel can be set to be used as a comparator and provide an active low reset output when the input voltage is either too high or too low. The corresponding threshold voltage can be programmed externally. The reset delay time can also be set for each supply, to allow for slight voltage spikes. The second channel compares the voltage of two voltage rails, and provides an active low reset output when the voltage difference exceeds the programmed threshold.

The device also supports PMU power supply monitoring, which monitors the 3.3V voltage Supply for over-voltages. If an over-voltage is detected, the device shuts off the power to the system, and the reset output is generated.

The BD4840G-TR also provides over-current detection and protection. It supports symmetrical and non-symmetrical over-current detection, so that an over-current event can be detected and the system reset.

Applications

The BD4840G-TR is well-suited for a variety of applications, such as server and blade servers, telecom and networking equipment, ASIC cards, and embedded systems. It is ideal for multi-rail systems, as its adjustable fields enable greater flexibility and control.

The BD4840G-TR provides reliable protection from over- and under-voltage events, over-voltage on the PMU node, and over-current, ensuring that system integrity is maintained. It is also easy to use and program, enabling faster system design, prototyping, and implementation.

Conclusion

The BD4840G-TR is a great example of a PMIC Supervisor, offering a wide range of features in a compact package. Its adjustable fields enable it to be used in multiple power supply systems, while its flexible reset and protection functions ensure reliable system operation. Its easy-to-use programming and implementation enable faster design and implementation, making it ideal for a variety of applications.

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