In the realm of hot swap applications, Analog Devices (ADI) presents the LT4200, a groundbreaking 50 A hot swap E-fuse with guaranteed SOA. This integrated solution enables boards to be safely inserted and removed from live backplanes, addressing the challenges associated with hot swapping.
The LT4200 amalgamates a hot swap controller, power MOSFET, and current sense resistor into a single package, making it an ideal choice for small form factor applications. Its MOSFET is rigorously tested during production to ensure it can withstand the stresses encountered in hot swap scenarios.
With a remarkable ability to sustain continuous operation at up to +85°C ambient temperature, the LT4200 offers a reliable solution for demanding environments. It incorporates separate inrush current control and a ±12% accurate 57 A current limit with output-dependent foldback. Moreover, the current limit threshold can be dynamically adjusted using the ISET pin, providing flexibility in controlling the system.
The LT4200 also boasts several additional features, including a current monitor output for ground-referenced current sensing and a MOSFET temperature monitor output. Furthermore, it incorporates thermal limit, overvoltage, undervoltage, and power good monitoring capabilities, ensuring comprehensive protection and reliable operation.
To demonstrate the LT4200's capabilities, Analog Devices has developed the DC3024A demonstration circuit. This circuit showcases the 50 A hot swap E-fuse and includes input voltage dividers for undervoltage and overvoltage protection. LEDs are incorporated to indicate input voltage, output voltage, fault and power bad conditions, while jumpers facilitate the enabling of auto retry and selection of circuit breaker delay. Turrets are also provided for monitoring various parameters, such as input voltage, output voltage, output status, and most of the pins on the LT4200.
In conclusion, Analog Devices' LT4200 emerges as a comprehensive solution for hot swap applications. Its integration of essential components, robustness in demanding environments, adjustable current limit, and advanced monitoring features make it a reliable choice for designers seeking efficient and safe hot swapping capabilities.
MOSFET SOA guarantees protection and reliability during hot swap stresses, including start-up inrush and current limiting
Integrated MOSFET simplifies design and reduces solution size
28 V abs max voltage rating on supply pin has better chance of surviving any transients beyond the 15 V max operating voltage
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