LTC4224IMS-2#PBF

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The LTC4224IMS-2#PBF is a Hot Swap controller specifically designed to control inrush currents associated with board-level circuitries. This IC ensures that batteries, memory, or other power supplies are connected to a system along with the rechargeable battery while keeping the peak currents low without sacrificing system performance. It also provides overcurrent protection, undervoltage lockout, and fault indication. The LTC4224IMS-2#PBF is an ideal choice for applications such as USB PD, Bluetooth speakres, automotive, and industrial control systems.

The LTC4224IMS-2#PBF belongs to the PMIC (Power Management IC) category. Power management integrated circuits (PMIC) are chips that integrate various power management functions, such as voltage regulation, power sequencing and timing, protection, and monitoring. They provide coordination of various power components for efficient power supply management. Hot Swap controllers are a type of PMIC used to control inrush currents in the electrical systems.

The LTC4224IMS-2#PBF is a single Hot Swap controller that helps control inrush currents associated with board-level circuitry. It helps safely add or remove a board to a live system using an externally controlledN MOSFET. The device features an accurate current limit and built-in thermal shutdown protection.It also features a selectable current limit, allowing up to 200W of power while keeping the peak currents low. In addition, the device provides overvoltage, undervoltage lockout, and fault indication.

In terms of working principle, the LTC4224IMS-2#PBF can be configured to enable it when the control signal is logic low or enable it when the external control signal is logic high. During insertion, the external control signal is applied to the enable input, causing thewithstand lower voltage due to transient voltages. In order to reduce the peak inrush currents and prevent the power source from being short-circuited by the live system, the LTC4224IMS-2#PBF includes a low-side N MOSFET with CS level dependent current limit and thermal foldback. When the load current crosses the current limit the CS pin pulls low, restricting the current.

Once the current reaches the pre-set current limit level, the device enters auto-retry mode. During this auto-retrymode, the LTC4224IMS-2#PBF monitors the VIN andIN pins to detect a voltage threshold. If the voltage stays below the low voltage threshold, the device resets itself, the N MOSFET is re-enabled, and the current-limiting cycle is repeated. If the voltage exceeds the high voltage threshold, theRetry output is logically high, indicating that the system can be safely powered.

Overall, the LTC4224IMS-2#PBF is an ideal choice for applications where board-level circuitries need to be connected or disconnected from a system safely with minimum stress and maximum performance. It eliminates the need for transient voltage suppressors and external current-limiting resistors. This Hot Swap controller provides the highest efficiency with the capability to withstand up to 200W of power and accurately regulate inrush currents. It is an ideal choice for applications such as USB PD, Bluetooth speakers, automotive systems and industrial control systems.

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