TPS259541DSGR

Texas Instruments TPS259541DSGR eFuse for 12‑V Rails: Fast OVP, 2.7–18 V Input, Up to 4 A, 34 mΩ Rds(on)

Engineers designing robust power distribution into servers, industrial controllers, or edge devices often need a compact, fast-acting protection switch that won’t waste power or board area. The Texas Instruments TPS259541DSGR answers that need: it’s a 12‑V eFuse power switch in a tiny 8‑WSON (DSG) package that combines fast overvoltage protection with a programmable current limit up to 4 A and a low on‑resistance of 34 mΩ (typ). Part of TI’s TPS25954x family, the TPS259541 is built for hot‑plug events and power‑rail protection where uptime and reliability matter.

At a glance

• Brand/manufacturer: Texas Instruments
• MPN: TPS259541DSGR (TPS25954x family)
• Category: Power Management ICs (eFuses)
• Function: 12‑V eFuse power switch with protections
• Input voltage range: 2.7 V to 18 V
• Current limit: Up to 4 A (programmable)
• On‑resistance (typ): 34 mΩ
• Key protections: Fast overvoltage protection, overcurrent protection, inrush current limiting
• Package: 8‑WSON (DSG), 2 × 2 mm
• Packaging: Tape & Reel (TR)
• Mounting type: Surface mount
• Pin count: 8

What the TPS259541 does and where it fits

The TPS259541DSGR is an integrated electronic fuse (eFuse) that sits in series with your power rail, acting as a smart solid‑state switch. Unlike a traditional fuse, an eFuse actively monitors the input and load conditions and responds in microseconds to faults such as overvoltage and overcurrent. When conditions are safe, it delivers low‑loss power to the load; when conditions go out of spec, it limits current or disconnects quickly to protect downstream circuitry and upstream converters.

Typical scenarios include hot‑plugging boards into a live backplane, protecting sensitive 12‑V rails in servers or storage, safeguarding industrial control cards, or partitioning power domains in embedded systems. The Texas Instruments TPS259541DSGR is optimized for these jobs with its combination of fast OVP, adjustable current limit up to 4 A, and small, thermally efficient 8‑WSON package.

Key specifications

• Input voltage range: 2.7 V to 18 V
• Maximum programmable current limit: Up to 4 A
• Typical on‑resistance (Rds(on)): 34 mΩ
• Integrated protections: Fast overvoltage protection, overcurrent protection, inrush current limiting
• Package/case: 8‑WSON (DSG), 2 × 2 mm
• Packaging: Tape & Reel (TR)
• Mounting type: Surface mount
• Pin count: 8

Note: Only parameters provided by the manufacturer’s product page and datasheet are listed here. For additional electrical characteristics and timing information, refer to the linked TI documentation.

How the protection works (and why it matters)

Fast overvoltage protection (OVP)

Power rails can spike for many reasons—adapter hot‑plug, inductive kickback, or transient events on upstream DC/DC converters. The TPS259541 reacts rapidly to clamp or disconnect the load when input voltage rises above safe levels. This fast OVP response helps prevent downstream IC damage, reduces field failures, and improves system robustness, especially in 12‑V backplanes and industrial power trees.

Programmable current limiting up to 4 A

Not all loads are the same, and inrush or steady‑state draw varies by design. The Texas Instruments TPS259541 lets you set a current limit (up to 4 A) that fits your load profile, preventing nuisance trips while still protecting traces, connectors, and power sources. In a fault, the device limits current to the programmed threshold—helpful for managing brownouts and preventing upstream converter collapse.

Inrush current limiting for hot‑plug

Capacitive loads can demand large inrush currents at startup. By controlling inrush, the eFuse lowers stress on connectors and supplies, smoothing startup and mitigating voltage droop on shared rails. This is particularly valuable in systems where multiple boards or modules may power up at once.

Low on‑resistance for efficiency

With a typical Rds(on) of 34 mΩ, the TPS259541DSGR minimizes conduction losses, supporting higher efficiency and lower self‑heating than discrete or higher‑Rds(on) solutions. Lower I²R losses translate into better thermal headroom, which is especially important in dense layouts and sealed enclosures.

Applications and use cases

• 12‑V rail protection: Shield sensitive loads from spikes and shorts while keeping downtime low.
• Hot‑plug and inrush current limiting: Protect connectors and upstream supplies when plugging modules into live systems.
• Industrial and computing systems: Safeguard PLC I/O cards, backplanes, storage controllers, network appliances, and servers.
• General‑purpose power distribution/eFuse applications: Use wherever a resettable, programmable, solid‑state protection switch is preferred over mechanical or sacrificial devices.

In practice, the TPS259541DSGR fits well in:

• Blade/server backplanes and storage arrays that demand fast fault isolation
• Industrial control cabinets where multiple 12‑V loads share a common bus
• Embedded gateways and edge AI boxes that require compact, efficient protection with predictable behavior

Design‑in notes and best practices

Current‑limit selection

The “up to 4 A” programmable current limit lets you tailor protection to your load’s steady‑state and transient needs. As a rule of thumb, choose a limit comfortably above your maximum continuous load but below the rating of connectors, traces, and upstream converters. Refer to TI’s datasheet for the exact method to set this value and any recommended external components.

Managing inrush for capacitive loads

Large output capacitances can extend startup time and demand higher inrush. When sizing your current limit, consider the output capacitance and allowable ramp time for your system. If multiple rails start together, staggered enables or soft‑start sequencing can further reduce bus droop.

Layout guidance for 8‑WSON (DSG)

• Keep the high‑current path short and wide to reduce resistive and inductive drops.
• Place input bypass and any recommended protection components close to the device pins.
• Follow TI’s recommended land pattern in the datasheet for the 2 × 2 mm 8‑WSON package.
• If the specific 8‑WSON variant includes a thermal or ground pad, use ample copper and thermal vias under the pad to spread heat (refer to package drawings for confirmation).

System‑level coordination

• Coordinate protection thresholds with upstream DC/DC output limits to avoid oscillations during fault events.
• If multiple eFuses share a rail, consider how their limits interact during simultaneous faults.
• For sensitive loads, verify behavior during fast OVP events so downstream devices meet their absolute maximum ratings.

Sourcing, lifecycle, and logistics

• Lifecycle status: Active (per Texas Instruments product information).
• Replacements or pin‑compatible alternates: Not specified in the provided data. Check TI’s cross‑reference tools if you require specific features or footprints.
• Package and packaging: 8‑WSON (DSG) 2 × 2 mm; delivered in Tape & Reel (TR) for automated assembly.
• Mounting and assembly: Surface‑mount compatible; follow TI’s reflow and handling recommendations for WSON devices.

Availability fluctuates with demand. For the most current stock and lead times, consult TI’s product page and authorized distribution channels.

Compliance and environmental information

• RoHS status: RoHS Compliant
• Other environmental, safety, or quality certifications: Not specified in the provided data.
• Operating temperature range and derating: Not specified in the provided data. Consult the TI datasheet for full environmental and electrical limits before finalizing the design.

The TPS25954x family context

The TPS259541DSGR belongs to TI’s TPS25954x family of eFuses. Family groupings typically offer variants with different protection thresholds, control options, or behavior. If you need a different overvoltage threshold, timing behavior, or interface feature, review the TPS25954x datasheet to find the closest match. Selecting within a single family often preserves footprint and many external components, streamlining alternate‑part qualification.

Note: This article references only parameters explicitly provided for TPS259541. For any feature comparisons within the TPS25954x family, consult Texas Instruments’ official documentation.

Why designers pick the Texas Instruments TPS259541DSGR

• Compact footprint with 2 × 2 mm 8‑WSON package frees board area in dense systems.
• Fast overvoltage protection improves downstream IC survivability during transients.
• Programmable current limiting up to 4 A adapts to varied load profiles without redesigning the power tree.
• Low 34 mΩ Rds(on) reduces losses and heat, helping efficiency and reliability.
• Backed by TI’s extensive documentation and support ecosystem for dependable design‑in.

Frequently asked questions (FAQs)

Q: What is the input voltage range of the TPS259541DSGR?
A: 2.7 V to 18 V.

Q: What is the maximum programmable current limit?
A: Up to 4 A (programmable), per the TI datasheet/product page.

Q: Does the device support fast overvoltage protection?
A: Yes. Fast overvoltage protection is a highlighted feature of the TPS259541.

Q: What is the typical on‑resistance?
A: 34 mΩ (typical).

Q: What package does the Texas Instruments TPS259541 use?
A: 8‑WSON (DSG), 2 × 2 mm, supplied in Tape & Reel (TR).

Q: Is the part RoHS compliant?
A: Yes. It is listed as RoHS Compliant.

Q: Are there specified replacements or pin‑compatible alternatives?
A: Not specified in the provided data. Check TI’s cross‑reference and the TPS25954x family for potential variants.

Q: Is the operating temperature range provided here?
A: Not specified in the provided data. Refer to the TI datasheet for environmental and electrical limits.

Resources

• Texas Instruments product page: https://www.ti.com/product/TPS259541
• Datasheet (TPS25954x family, including TPS259541): https://www.ti.com/lit/ds/symlink/tps25954x.pdf

Summary

The Texas Instruments TPS259541DSGR is a compact, capable eFuse designed to protect and control 12‑V rails and other supplies within a 2.7–18 V range. With fast overvoltage protection, a programmable current limit up to 4 A, and a low 34 mΩ typical on‑resistance, it addresses the most common causes of downstream damage and system instability—transients, shorts, and inrush. Its 8‑WSON (DSG) 2 × 2 mm package and Tape & Reel availability make it easy to deploy in high‑volume, space‑constrained designs. For engineering teams seeking a reliable, efficient power‑path protection switch from a trusted vendor, the TPS259541DSGR is a strong candidate to evaluate and design in.