Texas Instruments TPS259540DSGR

Overview

TPS259540DSGR 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 against overcurrent, overvoltage, inrush, and thermal faults.

For engineers reviewing the TPS259540DSGR datasheet, TPS259540DSGR pinout, TPS259540DSGR application, or TPS259540DSGR equivalent, key selection criteria include its latch-off fault response, WSON-8 package thermal performance (R_θJA = 65.6°C/W), IEC 62368-1 certification, and precise ±7.5% current limit accuracy across –40°C to +125°C.

Technical Context

The TPS259540DSGR integrates a low-R_ON N-channel MOSFET with internal charge pump, precision current-sense amplifier, and fast analog overvoltage clamp circuitry. Its 13.7-V fixed OVC threshold activates within 5 µs at 4-A load, limiting output voltage without external components.

It uses an external resistor on the ILM pin to set current limit (R_ILM = 487 Ω → 4.17 A typical), while the dVdt pin accepts a capacitor to control output slew rate (e.g., 3300 pF yields ~12.4 V/ms at 12 V). Fault indication is provided via open-drain FLT pin with 12-Ω pull-down resistance.

Key Specifications

Pinout & Package

TPS259540DSGR is housed in an 8-pin WSON package (2.00 mm × 2.00 mm) with exposed thermal pad soldered to GND for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS259540DSGR, TPS259541DSGR offers identical protection thresholds but replaces latch-off with auto-retry - useful in infrastructure gear where uptime outweighs fault persistence risk; TPS259621RVCR trades pin count and size for higher current, integrated QOD, and extended OVC, making it preferable for next-gen 6-A industrial modules.

Availability

TPS259540DSGR is available at Aetrix Electronics and suitable for industrial power distribution, adapter-powered consumer devices, and SSD/HDD power management requiring stable component supply and long-term lifecycle support.

Supply support for TPS259540DSGR 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 over 50 years of innovation in high-reliability IC design.

The TPS2595xx family was engineered specifically for robust, space-constrained board-level power protection - delivering integrated overvoltage clamping, precise current limiting, and safety certifications in sub-4-mm² packages.

FAQ

What is the overvoltage clamp threshold and response time of the TPS259540DSGR?

The TPS259540DSGR features a fixed 13.7-V overvoltage clamp threshold with a typical response time of 5 µs at 4-A load current. This clamping action limits the OUT pin voltage to ≤14.1 V during transients, protecting downstream 12-V logic without requiring external components. The clamp is internal and always active when the device is enabled.

How is current limit set and monitored on the TPS259540DSGR?

Current limit on the TPS259540DSGR is set using an external resistor (R_ILM) from the ILM pin to GND - for example, 487 Ω yields a typical 4.17-A limit. The same ILM pin provides a proportional analog monitor signal (276 µA/A gain), enabling real-time load current measurement without adding a sense resistor or ADC overhead.

Does the TPS259540DSGR support adjustable undervoltage lockout (UVLO)?

Yes, the TPS259540DSGR supports adjustable UVLO via its EN/UVLO pin. A resistor divider from IN to GND sets the enable threshold - the internal UVLO comparator triggers at 1.2 V (typ), allowing precise control of turn-on voltage (e.g., 3.3-V system enables at ~3.0 V input). The pin has ±0.1-µA leakage and requires no pull-up.

What fault response mode does the TPS259540DSGR use, and how is it signaled?

The TPS259540DSGR uses a latch-off fault response: upon overcurrent, overvoltage, or thermal shutdown, it disables the FET and holds OFF until the EN pin is cycled. Fault status is signaled via the open-drain FLT pin, which pulls low with 12-Ω effective resistance - requiring an external pull-up to monitor in systems like PLCs or SSD controllers.

What package type and thermal characteristics does the TPS259540DSGR have?

The TPS259540DSGR is packaged in an 8-pin WSON (2.00 mm × 2.00 mm) with exposed thermal pad. Its junction-to-ambient thermal resistance is 65.6°C/W, and junction-to-board is 28.3°C/W. The pad must be soldered to a GND plane for optimal thermal performance - enabling ≥1.5 W continuous dissipation at +85°C ambient.