TPS26630RGET

The TPS26630RGET is a member of Texas Instruments’ TPS2663x family of industrial eFuse protection devices. It is designed to provide robust power path protection in industrial systems operating from 4.5V to 60V supply rails. The device integrates a 31mΩ hot-swap MOSFET, eliminating the need for an external power switch and significantly reducing solution footprint compared to traditional hot-swap controller plus external FET architectures. The TPS26630 variant features adjustable overvoltage cutoff and active current limiting at 1× IOL without pulse overcurrent support. A key differentiator is the device’s ability to achieve IEC 61000-4-5 Class-A system performance during surge events, enabled by its fast reverse current blocking capability (0.17µs) and B-FET driver for external blocking FETs. The integrated thermal regulation loop allows reliable startup even with large and unknown capacitive loads, while the analog current monitor output (IMON) provides real-time load current visibility with ±6% accuracy. Target applications include PLCs, industrial PCs, servo drives, and any 24V/48V industrial system requiring comprehensive power path protection with regulatory compliance.

The TPS26630RGET operates as a fully integrated power path protector with three core subsystems:

1. **Hot-Swap and Inrush Control Subsystem**: At power-up, the internal FET is controlled by the dVdT slew rate circuit. An external capacitor on the dVdT pin sets the output voltage ramp rate, limiting inrush current to charge downstream capacitors. The thermal regulation loop monitors die temperature and modulates the FET gate drive to keep junction temperature within safe limits during startup with large capacitive loads.

2. **Overcurrent and Short-Circuit Protection Subsystem**: The current limit is set by an external resistor on the ILIM pin (RILIM ≥ 3kΩ), establishing a threshold from 0.6A to 6A with ±7% accuracy. During overload, the device actively limits current to the programmed threshold. During a hard short circuit, the fast-acting comparator trips within microseconds to protect downstream circuitry. The MODE pin selects between latch-off and auto-retry fault responses.

3. **Voltage Supervision and Reverse Protection Subsystem**: Adjustable UVLO and OVP circuits monitor the input voltage via resistor dividers on the UVLO and OVP pins, disconnecting the load when input voltage falls outside the programmed window. The B-FET driver controls an external N-channel FET for reverse polarity protection and reverse current blocking in 0.17µs. The PGOOD output signals when the output voltage is valid, enabling coordinated startup of downstream DC-DC converters.

• PLC power path protection: Provides hot-swap, overcurrent, overvoltage, and surge protection for 24V PLC backplane power rails with IEC 61000-4-5 Class-A compliance
• Industrial PC power distribution: Protects multiple power domains with adjustable current limits, voltage supervision, and coordinated startup via PGOOD output
• Servo drive auxiliary supply input: Safeguards 24V auxiliary power input against reverse polarity, surge transients, and short circuits in motor drive systems
• Redundant power supply multiplexing: Enables priority-based power mux operation using PGOOD and SHDN pins for seamless supply switchover
• Industrial fieldbus and sensor power: Protects remote field devices with accurate current monitoring (IMON) and fast fault isolation for system diagnostics