LTC1421ISW-2.5#TRPBF

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PMIC - Hot Swap Controllers are widely used in system level protection and optimization, providing safety of components when exposed to external power surges. The LTC1421ISW-2.5#TRPBF is a high-quality IC (Integrated Circuit) belonging to this category, which is a high-efficiency, low-cost solution for hot-swap protection applications.

In hot-swap circuits, it is essential to ensure reliable data and power connectivity, while preventing high inrush currents and reducing system power consumption. The LTC1421ISW-2.5#TRPBF is engineered to maximize the load current capability of load sources while minimizing the inrush current on supply sources. The device provides protection from overvoltage, overcurrent, shoot-through and transients from the applied supply. When connected between the supply and the load, it monitors both the load current and supply voltage and controls switching of loads to protect the system from damages due to overloads and shorts.

The circuit utilizes the MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) switching technique with dynamic current limiting. When the load is connected to the supply, the device charges a small capacitor and supplies enough gate voltage to the MOSFET, opening the switch. As the supply voltage increases, the device reduces the gate voltage to a safe level which turns off the switch in order to prevent damage caused by over voltage. When the load current rises above the preset level, the device reduces the gate voltage based on a linear current-mode function. This restricts the MOSFET current to the preset level, limiting the load current. The reverse current flow is prevented by the shoot-through protection circuitry of the LTC1421ISW-2.5#TRPBF.

The LTC1421ISW-2.5#TRPBF comprises of an internal linear regulator that monitors the power sources and provides direct control over the external MOSFET. The over-current protection is also enabled by an internal comparator that monitors the current through a sense resistor. An open-drain fault status output pin is used to indicate an over-current fault. A low voltage level drop-out at the enable pin allows system shut-down for preventing fault conditions. Moreover, the integrated under-voltage lockout (UVLO) circuitry with hysteresis provides an extra layer of system protection from under-voltage conditions.

Nowadays, hot-swap circuits employed in multi-movement system protection and other delicate circuits are widely used applications. The LTC1421ISW-2.5#TRPBF offers high power efficiency, low device cost and highly reliable current limiting protection that make it a natural choice for strategic hot-swap solutions. Moreover, its fault reporting and hysteresis features along with the over-voltage protection, provide an effective way to ensure system safety.

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