Texas Instruments TPS259521DSGR

Overview

TPS259521DSGR 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), auto-retry thermal shutdown, and adjustable current limit (0.5–4 A) via external resistor. It protects power rails in hot-swap, SSD, and industrial systems by limiting inrush, clamping surges, and monitoring load current via the ILM pin.

For engineers reviewing the TPS259521DSGR datasheet, TPS259521DSGR pinout, TPS259521DSGR application, or TPS259521DSGR equivalent, key selection criteria include its 3.8-V OV clamp threshold, auto-retry fault recovery mode, EN/UVLO active-high enable with programmable undervoltage lockout, and WSON-8 package compatibility with space-constrained PCB layouts.

Technical Context

The TPS259521DSGR integrates a low-R_ON N-channel MOSFET switch, precision current-sense amplifier, fast analog overvoltage clamp circuit, and digital fault logic with auto-retry behavior. Its UVLO is set via external resistor divider on the EN/UVLO pin, and output slew rate is controlled by capacitor on dVdt pin.

It operates across –40°C to +125°C junction temperature, supports up to 4 A continuous current at full temperature range, and features IEC 62368-1 certification and UL 2367 recognition for safety-critical power distribution. Fault reporting occurs via open-drain FLT pin with 12 Ω pull-down resistance.

Key Specifications

Pinout & Package

TPS259521DSGR uses an 8-pin WSON package (2.0 mm × 2.0 mm) with exposed thermal pad soldered to PCB ground plane for optimal 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 TPS259521DSGR, TPS259520DSGR offers identical protection thresholds but removes auto-recovery-critical for fail-safe systems-while TPS259421RVCR trades current monitoring and higher current capability for reduced cost and size in less demanding applications.

Availability

TPS259521DSGR is available at Aetrix Electronics and suitable for hot-swap, SSD/HDD power management, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and certified safety compliance.

Supply support for TPS259521DSGR 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 automotive and industrial qualification expertise.

The TPS2595xx family is designed for robust, integrated power path protection in space-constrained, high-reliability systems-emphasizing fast transient response, programmable thresholds, and safety certification out-of-the-box.

FAQ

What is the overvoltage clamp threshold and response time of the TPS259521DSGR?

The TPS259521DSGR features a factory-set 3.8-V (typical) overvoltage clamp with a 5-µs typical response time when output current exceeds 4 A. This clamping action limits the OUT pin voltage to protect downstream 3.3-V components during input surges, and no external components are required to enable this function. The TPS259521DSGR maintains this specification across its full operating temperature range (–40°C to +125°C).

How does the TPS259521DSGR implement auto-retry thermal shutdown?

The TPS259521DSGR triggers thermal shutdown at 157°C junction temperature and enters auto-retry mode, attempting re-enabling every 93 ms once the die cools below 152°C (5°C hysteresis). This behavior is inherent to the TPS259521DSGR variant and does not require external circuitry. It contrasts with latch-off variants like TPS259520DSGR, making the TPS259521DSGR ideal for applications needing autonomous recovery from temporary overloads.

Can the current limit of the TPS259521DSGR be adjusted, and what is its accuracy?

Yes-the TPS259521DSGR current limit is set by an external resistor (R_ILM) from the ILM pin to GND, supporting 0.5 A to 4 A range. With R_ILM = 487 Ω, the nominal limit is 4.17 A, with ±7.5% accuracy over temperature and line conditions. The TPS259521DSGR also provides proportional current monitoring (276 µA/A) on the same ILM pin, enabling real-time load telemetry without additional sensing components.

What package type and thermal characteristics does the TPS259521DSGR use?

The TPS259521DSGR uses an 8-pin WSON package (2.0 mm × 2.0 mm) with an exposed thermal pad. Its thermal metrics include R_θJA = 65.6°C/W (JEDEC standard board) and R_θJB = 28.3°C/W, enabling reliable 4-A operation at +105°C ambient when the pad is properly soldered to a ≥100-mm² GND copper area. The TPS259521DSGR's R_θJC(bot) of 9.8°C/W confirms efficient heat transfer through the bottom thermal pad.

Does the TPS259521DSGR support programmable undervoltage lockout (UVLO)?

Yes-the TPS259521DSGR implements programmable UVLO via its EN/UVLO pin. Applying a resistor divider from IN to GND sets the turn-on threshold (e.g., 2.7 V input = 1.2 V at EN/UVLO). The internal UVLO comparator has 1.20 V (rising) and 1.10 V (falling) thresholds, providing hysteresis. This feature allows the TPS259521DSGR to delay power delivery until input voltage stabilizes, preventing brownout-induced system resets.