Texas Instruments TPS259520DSGT

Overview

TPS259520DSGT from Texas Instruments is a 2.7 V to 18 V, 4-A eFuse IC with 34 mΩ on-resistance, 3.8-V fast overvoltage clamp (5 µs response), active-high enable with adjustable UVLO, and integrated current limit/monitor (±7.5% accuracy). It protects power rails in hot-swap, SSD, and industrial systems against overcurrent, overvoltage, and inrush surges.

For engineers reviewing the TPS259520DSGT datasheet, TPS259520DSGT pinout, TPS259520DSGT application, or TPS259520DSGT equivalent, key selection criteria include its latch-off thermal shutdown behavior, fixed 3.8-V OVC threshold, absence of quick output discharge, and WSON-8 (2.0 mm × 2.0 mm) package with exposed thermal pad.

Technical Context

The TPS259520DSGT implements a single-channel integrated FET eFuse with internal charge pump driving an N-channel MOSFET. Its protection architecture combines fast analog overvoltage clamping (no external components), digitally controlled current limiting via ILM pin resistor, and independent fault detection logic that pulls FLT low on overcurrent, overtemperature, or overvoltage events.

It operates across –40°C to +125°C junction temperature, supports adjustable slew rate via external dVdt capacitor, and features UVLO hysteresis (100 mV) on the EN/UVLO pin. The device uses a dedicated GND pad for thermal dissipation and requires no external gate driver or sense resistor beyond RILM and CdVdt.

Key Specifications

Pinout & Package

TPS259520DSGT is housed in an 8-pin WSON package (2.00 mm × 2.00 mm) with an exposed thermal pad (GND-connected) for enhanced thermal performance. The package is RoHS-compliant and optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar eFuse applications.

Compared with TPS259521DSGT, the TPS259520DSGT provides deterministic fault handling via latch-off behavior-critical for safety-critical industrial resets-while TPS259421RGET trades current capacity and package size for cost-sensitive consumer designs lacking 4-A requirements.

Availability

TPS259520DSGT is available at Aetrix Electronics and suitable for hot-swap systems, SSD/HDD power management, and industrial control panels requiring stable component supply, long-term lifecycle support, and compliance with IEC 62368-1.

Supply support for TPS259520DSGT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management ICs and industrial-grade reliability.

The TPS2595xx product line delivers highly integrated eFuse solutions for robust circuit protection in demanding environments-designed specifically for hot-swap, adapter-powered, and safety-certified systems where precision current limiting and fast overvoltage response are critical.

FAQ

What is the overvoltage clamp threshold of the TPS259520DSGT?

The TPS259520DSGT has a fixed overvoltage clamp threshold of 3.8 V (typical), with a guaranteed range of 3.65 V to 4.1 V. This internal clamp activates within 5 µs when the output exceeds the threshold, protecting downstream components without requiring external TVS diodes. The TPS259520DSGT does not support programmable overvoltage lockout-only the TPS259573 variant offers that feature.

Does the TPS259520DSGT support quick output discharge (QOD)?

No, the TPS259520DSGT does not support quick output discharge. The QOD function is exclusive to the TPS2595x5 variants (e.g., TPS259525DSGT), which feature a dedicated QOD pin. The TPS259520DSGT uses the FLT pin for fault indication and lacks both QOD functionality and the associated pin configuration-its OUT pin discharges only through the load or external bleed circuitry.

How is current limit set on the TPS259520DSGT?

Current limit on the TPS259520DSGT is set using a single external resistor (RILM) connected between the ILM pin and GND. With RILM = 487 Ω, the typical current limit is 4.17 A (range: 3.87–4.42 A). The relationship is inverse: higher resistance yields lower current limit (e.g., 4420 Ω → 0.49 A). The ILM pin also provides a proportional monitor voltage (276 µA/A) for real-time load current measurement.

What is the thermal shutdown behavior of the TPS259520DSGT?

The TPS259520DSGT features latch-off thermal shutdown: when junction temperature reaches 157°C, the device turns off and holds the output disabled until the EN/UVLO pin is cycled (driven low then high). It does not auto-retry. This behavior differs from the TPS259521DSGT, which implements auto-retry with a 93-ms interval. The latch-off mode ensures fault persistence is acknowledged before resuming operation.

What package type and footprint does the TPS259520DSGT use?

The TPS259520DSGT uses an 8-pin WSON package (DSG suffix) measuring 2.00 mm × 2.00 mm with an exposed thermal pad. The pad must be soldered to a PCB GND plane for thermal performance. Pin 1 is dVdt, pins 3–4 are IN, pin 5 is OUT, pin 6 is FLT, pin 7 is ILM, and pin 8 is GND-with the thermal pad electrically and thermally connected to GND.