LTC2905HDDB#TRPBF

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Power management integrated circuits (PMICs) are a set of integrated circuits that control a variety of power supply tasks in electronics, ranging from voltage regulation to monitoring, planar protection and more. Supervisory PMICs, in particular, dedicated to connecting, monitoring, and controlling protection circuits to maximize system reliability, are a type of PMICs. One such product is the LTC2905HDDB#TRPBF from Linear Technologies. This application note looks at the LTC2905HDDB#TRPBF in more detail, including its application field and working principle.

Application Field

The LTC2905HDDB#TRPBF is primarily used to monitor system load currents and input voltages, with a focus on providing protection to devices and systems in industrial, automotive, and commercial applications. Its high-side current measurement capability allows systems to monitor direct-to-battery loads, with the monitoring range extending down the 10s of mA, while its analog-to-digital converters (ADCs) can accurately measure input voltage range from 0.6 V to 27 V. This scalability makes the LTC2905 ideal for monitoring a wide range of voltages and currents in a single chip.

In terms of protection, the LTC2905 offers overvoltage and undervoltage protection in both high-side and low-side configurations, as well as overcurrent protection through the current sense amplifier (CSA). It also offers a wide range of system-level diagnostics and protection, including short-circuit detect and over-power detect modes, as well as reverse current sensing and extended duration diagnostics.

Working Principle

At the core of the LTC2905’s working principle are its various built-in analog-to-digital converters and current sense amplifiers. The ADCs, built using Linear Technologies’ proprietary Analog-to-Digital-Converter (ADC)-on-a-Chip technology, provide accurate analog-to-digital conversions of both voltages and currents. The ADCs have an eight-bit resolution, which allows for flexible monitoring of input voltages and current load states.

The LTC2905’s current sense amplifier, meanwhile, is tailored to meet the needs of industrial, automotive, and commercial applications. It is specially designed to be able to measure load currents with high accuracy, even in situations where the power supply is slightly overloaded or subject to rapid changes. The CSA also supports analog circuit protection by allowing the chip to detect overcurrent conditions and immediately shut off to protect the load.

In addition to these components, the LTC2905HDDB#TRPBF includes a variety of control and diagnostic functions. For instance, the chip can detect a loss of its own power, as well as extended duration faults. Additionally, the chip can detect a sequence of faults that may be indicative of a system fault and can immediately trip its over-current protection circuit. The range of diagnostics provided by the LTC2905 make it an effective solution for a range of applications.

Overall, the LTC2905HDDB#TRPBF from Linear Technologies is an effective power management integrated circuit for applications demanding high levels of protection and diagnostic capability. It combines a range of analog-to-digital converters and current sense amplifiers to accurately measure voltage and load states, while offering comprehensive protective and diagnostic control options. As such, it is a great choice for any application where power management and system monitoring are important.

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