UCC2913NG4

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The UCC2913NG4 is a robust hot-swap integrated circuit designed to facilitate safe inrush current limiting and safe board powering applications in telecom, relay, data-center and other related systems. Its efficient design supports accurate current balancing and prevents inrush current from exceeding safe limits by distributing it over several channels. The device also features integrated power FETs, allowing for a great reduction in system size and cost, as well as for excellent thermal fault protection.

Overview

The UCC2913NG4 hot swap controller integrates switching transistor, current sense resistor, eddy current sensing and input voltage sensing into one highly integrated dual-channel device. The device helps protect system components from overvoltage, overcurrent and over temperature by providing accurate current monitoring and protection of load power transistors. The UCC2913NG4 also enables system designers to accurately set hot-swap inrush current limits, efficiently balance groups of load FETs, and measure supply/load side voltages.

The UCC2913NG4 is designed to provide strong fault protection across all channels. It enables monitoring of channel inductor current, channel fault current, channel temperature and channel voltage. The device can also detect supply rail fault, multi-fault detection, over temperature fault and VBUS under-voltage lockout.

Applications

The UCC2913NG4 is commonly used in applications where high power density, short circuit safety and high system efficiency are desired. Specifically, it is used for hot-swapping modules in telecom and data center systems, such as open blade servers, blade servers, line cards and other high-power modules. Additionally, it is also widely used in server power racks, access point power systems and DC power distribution systems.

Working Principle

The UCC2913NG4 works by using a dual P-channel MOSFET in a high side switch configuration that provides current limiting and hot swap control. When the input voltages reach the preset under-voltage lockout threshold, the device automatically places the switch in an off-state, preventing current from overloading downstream components. It also provides a controlled ramping of the two load power transistor gate drive currents, which allows the reduction of current stress on the load FETs, reducing power losses.

The device can measure supply voltage, load voltage, and load current. It then uses an inner-loop, adjustable frequency control to regulate the load current, thereby maintaining a constant current to the load. An outer loop controller then monitors both the load voltage and load current, in order to set the peak current limit before protection sets in. The device also features a thermal sensor, which allows the system to shut down itself in the event of an over temperature fault.

Conclusion

Overall, the UCC2913NG4 is a highly integrated hot-swap controller that provides an end-to-end solution for safe and efficient hot swapping, current balancing, and system monitoring. Its highly integrated design offers low design complexity, allowing for less components and cost on the board. The unique features of the UCC2913NG4 make it an ideal choice for applications such as blade servers, rack-mounted power systems, and DC power distribution, where reliable hot-swapping and fault protection are critical.

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