LTC4224IDDB-1#TRPBF

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Power management integrated circuits (PMIC) are essential components in any electronic device. PMICs are used to regulate the amount of power delivered to the device, monitor the battery levels, and adjust the working voltages to the optimal level. Hot-swap controllers are a specific type of PMICs used in power distribution. In this article, we will discuss the application field and working principle of the LTC4224IDDB-1#TRPBF hot-swap controller.

The LTC4224IDDB-1#TRPBF is a hot-swap power distribution controller IC designed to provide both hot-swap control and overvoltage protection for single-supply systems. It has an internal P-channel MOSFET and an adjustable undervoltage lockout (UVLO) to help protect circuits from inrush current, short-circuit current, and overvoltage conditions. It also has a soft-start capability, a built-in low-side current sense amplifier, overcurrent protection (OCP) to detect load current, and a hard-start clamp for providing appropriate drive to the MOSFET for current limiting applications.

The LTC4224IDDB-1#TRPBF is ideal for applications that require a hot-swap controller and overvoltage protection with adjustable UVLO. The device is designed to be used in computer motherboards, network switches, peripheral circuit boards, memory modules, HDDs, display cards, and other systems that require hot-swap/overvoltage protection. The adjustable UVLO feature makes the device suitable for use with a wide variety of DC voltage levels.

The LTC4224IDDB-1#TRPBF features an internal P-channel MOSFET that works as an active clamp for the adjustable UVLO. The MOSFET is activated by the UVLO signal, which reduces the input voltage on the hot-swap line to below the minimum UVLO threshold. The input current is then limited to a value that is half the gate voltage and only limited by the internal resistor. When the MOSFET is activated, the low-side current sense amplifier generates a signal that is proportional to the load current. The current sense signal is then integrated and compared to the OCP limit to determine when the current reaches the OCP limit, at which point the MOSFET is disabled.

The LTC4224IDDB-1#TRPBF also features a soft-start capacitor which reduces the inrush current during start-up. The soft-start capacitor is charged by the UVLO signal, and when the capacitor is fully charged, the device is enabled and the current limiting circuit is activated. The device also features a hard-start clamp, which provides a boost to the MOSFET drive during current limiting operation. The hard-start clamp can provide up to 1.3V of drive to the MOSFET, allowing it to draw up to 7A of current.

In conclusion, the LTC4224IDDB-1#TRPBF is a hot-swap power distribution controller IC with adjustable UVLO. It is ideal for applications that require current limiting, OCP, and hot-swap control. The adjustable UVLO allows the device to be used for a wide range of DC voltages, and the OCP and soft-start features help protect against overcurrent and overloads. The hard-start clamp can provide up to 1.3V of drive to the MOSFET. This allows the device to draw up to 7A of current, allowing it to be used in a wide range of applications.

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