TPS2051DR

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TPS2051DR is a high-side power distribution switch and load driver designed to support hot-swapping in order to enable safe system power-up, power-down, and fault isolation. It is an integrated power switch and load driver optimized for regulating power and protecting the load from overvoltage/overcurrent conditions. This device is an ideal power distribution switch for a wide range of applications, such as ATX power supplies, point-of-load DC/DC converters, PCIe, SFF, and mobile power systems.

The TPS2051DR is a high-side n-channel MOSFET power switch that can support RDS(on) values down to 8 mΩ. It provides current limiting, overvoltage protection, soft-start, and Fault Status signaling that can be used to indicate a failure condition. The device has three sets of outputs: Main OUT, VCC, and SLV. The Main OUT sets the current limit as it is the output path when overcurrent is detected. VCC is Enable voltage that powers the internal circuitry present on the chip. SLV is the Slave pin which sets the current limit for the other pins, like the high-side switch, providing monitoring and protection.

The device also has an internal 2.2A current limit circuit that provides constant current edge on the Main OUT. This is configured using the external resistor. The edge current is proportional to the external resistor. This current limit circuit works with synchronization to the input current and protects the output from damage due to excessive load conditions. The device also has an overvoltage protection circuit that protects against voltage spikes and surges by providing a constant source current transistor to protect the outputs.

The device utilizes a unique current sharing technology to provide a low-impedance connection between the Main OUT and Slave pins. This provides a very low-current path between the pins and reduces the losses associated with interconnects. The current sharing between the pins ensures that the power delivered to the load is sourced from the Main OUT, providing a more reliable power delivery system.

The TPS2051DR also includes a Fault Status indicator (FS) output. This output pin provides information back to the system to indicate a reverse current, overvoltage, or overcurrent condition. When any of these conditions occur the output pin goes active low, providing the system with information about the cause of the fault. The Fault Status pin can then be used to initiate a power-down or fault isolation sequence.

The TPS2051DR is a versatile high-side power switch and load driver thanks to the wide range of features it provides, including current limit, overvoltage protection, soft start, and Fault Status signal output. This device is suitable for ATX power supplies, point-of-load DC/DC converters, PCIe, SFF, and mobile power systems. It is a critical component for providing a safe and efficient system power-up, power-down, and fault isolation.

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