UCC3913DTRG4

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The UCC3913DTRG4 is part of Texas Instruments’ Power Management Integrated Circuit (PMIC) series, specifically designed to serve as Hot Swap Controllers. This type of ICs provide a powerful means of removing in-rush currents associated with circuit or system startup power applications. Hot Swap Controllers provide a linearly adjustable current limit in order to enable or disable hot-insertion capability of a specific circuit or system design, allowing the user to adjust the amount of current applied to the circuit or system once the proper voltage has been reached and detected. This linear current limit is typically set using a current-setting resistor.

UCC3913DTRG4 Application Field

The UCC3913DTRG4 is particularly suitable for applications requiring Hot Swap functionality, such as hotswapping an FPGA/ASIC onto an application board. It is also suitable for determining the proper voltage level and current limit of a circuit or system being powered up and allowing the user to adjust the same. Since the circuit is adjustable, the user has control over current flow and can adjust to lower current levels if needed.

UCC3913DTRG4 Working Principle

The UCC3913DTRG4 PMIC consists of a voltage detector, a current-limiting circuit and a logic block.

The first block monitors the supply voltage and when the user-specified voltage level has been reached, it initiates the Hot Swap transition.

The second block is a current-limiting circuit which adjusts the output current to the desired level. This block also triggers the third block, which sets the Hot Swap output pin of the UCC3913DTRG4 high, simulating a conventional switch-on behavior to the load.

In addition, the UCC3913DTRG4 also features outputs that indicate the corresponding conditions: the transition from normal (continuous) mode to Hot Swap, the power-up transition, the current-limit transition and the over-current fault.

Conclusion

The UCC3913DTRG4 is an ideal solution for Hot Swap Controller applications, since it provides a reliable, adjustable and fault-detecting way of identifying and controlling the power needs of a specific circuit or system. The current-limiting circuit helps to monitor and adjust the power consumption of the circuit or system, while the other outputs allow for the quick detection of any over-current events that may occur.

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