LT4256-2IS8#TRPBF Integrated Circuits (ICs)

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The LT4256-2IS8#TRPBF is a Hot Swap controller from Linear Technology, designed to manage the power distribution supply in a system. It is composed of a programmable current limit, an analog digital converter and output drivers, with the main goal of controlling input and output voltages; limiting currents during start-up, shut-down and fault conditions; and providing digital drive for external devices such as FETs, MOSFETs and relay drivers. The LT4256-2IS8#TRPBF also includes dual over-current, over-voltage, under-voltage and negative voltage protection, as well as thermal shutdown.

Application Field

Structural electronics, IoT, industrial electronics, the medical industry, and automotive applications are amongst the many areas in which Linear Technology’s LT4256-2IS8#TRPBF is suitable. But this PMIC (Power Management IC) includes more than just the Hot Swap controller function.

The LT4256-2IS8#TRPBF is ideal for use in high power supply applications and circuit boards in which power surges could potentially cause damage. Power supply features such as remote sensing, current limiting and overvoltage protection increase the system robustness significantly.

It is also suitable for telecommunication devices and systems, where instantaneous power shut down is desired for various reasons, such as a faulty system, short circuit or the remote shut down of other devices and components in the system.

Working Principle

The LT4256-2IS8#TRPBF works by monitoring the input and output voltages, turning the power off if both of these values fall below the thresholds set in the specifications. When the circuit turns off, a soft-start ramp sequences the power on slowly enough so as to avoid current surges in the system and thereby minimize potential damage.

It includes an integrated delta current monitor which has a programmable threshold that can detect a small current pulse and can be used to protect against system overloads. It also provides a pin to enable remote sensing, that is, compensating for the voltage drops caused by long distance wires.

It functions with a peak current limit and a timer controlled current limit, where the last one will hold the output voltage for a specified time during start-up and shut-down, reducing the probability of overshoot/undershoot which can potentially damage the system.

This PMIC also includes a high efficiency-rail-to-rail output driver that is capable of sourcing and sinking up to 600mA. Since internal fault protection limits the output current, allowing the external FET to switch both the positive and negative rail of a system, the LT4256-2IS8#TRPBF PMIC can switch large rail voltages up to 24V within a few microseconds.

Conclusion

To sum up, the LT4256-2IS8#TRPBF PMIC Hot Swap controller from Linear Technology provides a complete power management solution for industries with high power supply requirements, and is suitable for various applications where instantaneous power shutdown, current limiting and overvoltage protection are critical features.

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