Texas Instruments TPS259540DSGT

Overview

TPS259540DSGT from Texas Instruments is a 2.7 V to 18 V, 4-A eFuse IC with 34 mΩ on-resistance, 13.7-V fast overvoltage clamp (5 µs response), adjustable current limit (0.5–4 A), and active-high enable with UVLO. It protects power rails in adapter-powered industrial systems and SSDs against overcurrent, overvoltage, and inrush surges.

For engineers reviewing the TPS259540DSGT datasheet, TPS259540DSGT pinout, TPS259540DSGT application, or TPS259540DSGT equivalent, key selection criteria include output voltage clamp threshold (13.7 V typ), latch-off fault behavior, thermal shutdown at 157°C, WSON-8 package footprint, and ILM-based current monitoring accuracy (±7.5%).

Technical Context

The TPS259540DSGT implements a single-channel integrated FET hot-swap controller with factory-trimmed 13.7-V overvoltage clamp and latch-off fault response. Its control logic combines UVLO-enabled startup sequencing, dVdt-controlled slew rate via external capacitor, and real-time load current sensing through the ILM pin.

It features internal charge-pump gate drive for low RON (34 mΩ typ at 25°C), thermal shutdown with 5°C hysteresis, and open-drain FLT pin signaling overtemperature, overcurrent, or overvoltage events - all without requiring external protection components beyond RILM and CdVdt.

Key Specifications

Pinout & Package

TPS259540DSGT is housed in an 8-pin WSON package (2.00 mm × 2.00 mm, 0.5-mm pitch) with exposed thermal pad connected to GND for enhanced heat dissipation (R_θJB = 28.3°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS259540DSGT, TPS259541DSGT offers identical protection thresholds but trades latch-off safety for auto-retry convenience, while TPS259621RTER adds integrated biasing capability at the cost of higher quiescent current and different fault-handling architecture.

Availability

TPS259540DSGT is available at Aetrix Electronics and suitable for industrial control modules, adapter-powered systems, SSD/HDD power management, and set-top box designs requiring stable component supply with full production lifecycle support.

Supply support for TPS259540DSGT 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 leader specializing in analog, embedded processing, and power management technologies with decades of industrial-grade reliability validation.

The TPS2595xx family is designed specifically for robust, space-efficient circuit protection in high-reliability DC power distribution - targeting hot-swap, adapter-fed, and industrial edge equipment where fault containment and certification compliance are critical.

FAQ

What is the overvoltage clamp threshold and response time for TPS259540DSGT?

The TPS259540DSGT features a factory-set overvoltage clamp threshold of 13.7 V (typical), with a response time of 5 µs when output current exceeds 4 A. This clamping action limits the OUT pin voltage to ≤14.1 V (max) during transients, protecting downstream 12-V logic without external components. The TPS259540DSGT does not support user-programmable OVLO - only fixed 13.7-V clamping.

How is current limiting configured on TPS259540DSGT?

Current limiting on the TPS259540DSGT is set using a single external resistor (RILM) connected from the ILM pin to GND. With RILM = 487 Ω, the device delivers a typical current limit of 4.17 A (±7.5% accuracy). The ILM pin also provides a proportional analog monitor signal (276 µA/A) for real-time load current measurement, enabling closed-loop diagnostics without additional sensing hardware.

Does TPS259540DSGT support adjustable output slew rate, and how is it implemented?

Yes, the TPS259540DSGT supports adjustable output slew rate via the dVdt pin. Connecting an external capacitor (e.g., 3300 pF) from dVdt to GND slows the output voltage ramp, reducing inrush current during hot-plug events. With no capacitor, the device achieves maximum slew rate (e.g., 38.2 V/ms at 12 V input); with 3300 pF, it drops to 12.4 V/ms - enabling precise control of capacitive load charging without redesigning the power stage.

What fault response mode does TPS259540DSGT use, and how is it signaled?

The TPS259540DSGT uses a latch-off fault response mode: upon overcurrent, overvoltage, or overtemperature detection, it disables the internal FET and holds the FLT pin low until the input power is cycled or the EN pin is toggled. The FLT pin is open-drain and requires an external pull-up resistor. This behavior ensures persistent faults do not cause uncontrolled retry cycles - a critical safety feature for industrial and storage applications.

What package type and thermal characteristics apply to TPS259540DSGT?

The TPS259540DSGT is packaged in an 8-pin WSON (DSG) case measuring 2.00 mm × 2.00 mm with 0.5-mm pitch and an exposed thermal pad. Its thermal resistance is characterized as R_θJA = 65.6°C/W (junction-to-ambient) and R_θJB = 28.3°C/W (junction-to-board), enabling reliable 4-A operation at +125°C junction temperature when mounted on 2 oz copper with adequate thermal vias under the pad.