LTC4229IG#PBF

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PMIC - Hot Swap Controllers technology provides a robust system solution enabling safe and reliable insertion and removal of live power supplies from a system. The LTC4229IG#PBF is an integrated controller and FET for Hot-Swap applications. This part is capable of providing controlled inrush currents and eliminating unexpected supply drops from a system.

Features of the LTC4229IG#PBF allow battery backed systems, +3.3V or +5V rail Hot-Swapping, eliminating system reset when adding supplies and delivering up to 16A of current at 6V.

Application Field

The LTC4229IG#PBF is a Hot-Swap controller that is used in applications such as accessing SRAM, FLASH, digital signal processing (DSP) and FPGA devices when system power is turned off. This helps systems drawing power directly from the supply to remain reliable when adding a live supply.

It also enables a system to be powered up when gate drivers and workloads can draw a large amount of current while the supply power rails are still below the device’s supply voltage.

As Hot-Swap controllers offer a safe and reliable way to add and remove power from a system, the LTC4229IG#PBF can be used in applications such as Hot-Swap power controllers, mobile device chargers, power supplies, server backplanes, switches, PDAs and smartphones.

Working Principle

The LTC4229IG#PBF combines a high-side n-channel MOSFET, hot-swap controller, overcurrent and overtemperature protection, system power supply monitor and gate driver. The part can handle a high inrush current of up to 16A of current at 6V, as well as over-current and over-temperature protection.

The LTC4229IG#PBF also features an UVLO (under-voltage lockout) function to safely shutdown the system if the voltage dips too low for any application. It has an active discharge feature, which pulls the output pin to ground when the load is connected and then back up when the load is removed.

The LTC4229IG#PBF also provides an asynchronous input pin, which can be used to monitor other system supplies or act as a power-on reset signal. The part has a programmable slew-rate controlled switching frequency, allowing the user to optimize operation and reduce system noise. The part also features conductor impedance measurements to reduce application board area.

The LTC4229IG#PBF also provides an open-drain RESET output pin that can be used to reset other parts in the system. This allows the system to stay in reset until the device has been thoroughly checked and the power has been stabilized. It also adds an extra layer of protection to the system.

Conclusion

Overall, the LTC4229IG#PBF is an excellent choice for Hot-Swap applications, providing controlled inrush currents, over-current and overtemperature protection, conductor impedance measurements and UVLO protection. In addition, its programmable slew-rate controlled switching frequency and open-drain RESET output pin, allow the user to optimize operation and reduce system noise at the same time.

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