Texas Instruments TPS259474LRPWR

Overview

TPS259474LRPWR from Texas Instruments is a 2.7V–23V, 5.5A eFuse with true reverse current blocking, integrated back-to-back FETs (RON = 28.3mΩ typ), latch-off overcurrent response, and input reverse polarity protection down to –15V. It delivers fast short-circuit protection (500ns typ), adjustable current limiting (0.5A–6A), and digital fault indication (FLT) for high-reliability power rail protection in USB PD docks and server motherboard power MUXing.

For engineers reviewing the TPS259474LRPWR datasheet, TPS259474LRPWR pinout, TPS259474LRPWR application, or TPS259474LRPWR equivalent, key selection criteria include its latch-off circuit-breaker mode, 10-pin HotRod™ QFN package, –40°C to +125°C operation, UL 2367 recognition (E339631), and IEC 62368-1 CB certification - all critical for industrial-grade adapter input and enterprise storage protection designs.

Technical Context

The TPS259474LRPWR implements a dual-FET architecture with independent gate control to enforce true reverse-current blocking at all times, eliminating DC reverse flow even during input loss. Its latch-off overcurrent response (vs auto-retry) ensures persistent fault isolation until manual reset, while the FLT pin provides open-drain active-low fault signaling synchronized to 500ns short-circuit detection.

Overvoltage protection uses an adjustable OVLO threshold (set via resistor divider on OVLO pin) with 1.2μs typical response, and undervoltage lockout (UVLO) on EN/UVLO pin is independently configurable. The device supports slew-rate control via external capacitor on dVdt pin and analog load current monitoring (±6% accuracy ≥1A) through the dual-function ILM pin.

Key Specifications

Pinout & Package

TPS259474LRPWR is housed in a 2mm × 2mm, 10-pin HotRod™ QFN (RPW) package with exposed thermal pad for enhanced power dissipation and compact board layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS259474LRPW, TPS259470LRPW offers active current limiting and AUXOFF signaling but lacks latch-off safety; TPS259474ARPW shares identical protection thresholds and timing but auto-retries faults - making TPS259474LRPW uniquely suited for applications demanding guaranteed, persistent isolation after overcurrent events.

Availability

TPS259474LRPWR is available at Aetrix Electronics and suitable for USB PD dock protection, server motherboard power MUXing, enterprise storage RAID controllers, and patient monitor power input applications requiring stable component supply, long-term lifecycle support, and certified safety compliance.

Supply support for TPS259474LRPWR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The TPS25947xx family is designed as highly integrated eFuses for robust, small-footprint power rail protection - targeting applications needing reverse-current blocking, programmable overcurrent response, and safety certifications in space-constrained systems.

FAQ

What protection modes does the TPS259474LRPWR support?

The TPS259474LRPWR supports overvoltage lockout (adjustable OVLO), undervoltage lockout (configurable EN/UVLO), short-circuit protection (500ns fast-trip), latch-off overcurrent limiting (circuit-breaker mode), true reverse-current blocking, and input reverse polarity tolerance down to –15V. All functions operate without external components beyond resistors and capacitors for threshold/slew-rate tuning. The TPS259474LRPWR integrates these protections into a single 2mm × 2mm HotRod™ QFN package.

How is overcurrent protection configured on the TPS259474LRPWR?

Overcurrent protection on the TPS259474LRPWR is set using an external resistor (RILM) connected from the ILM pin to GND, supporting adjustable thresholds from 0.5A to 6A. The device operates in latch-off circuit-breaker mode: once triggered, it disables the output until manually reset. The ILM pin also provides analog current monitoring with ±6% accuracy for IOUT ≥ 1A. The TPS259474LRPWR does not support auto-retry or active current limiting - those are features of other variants like TPS259470x.

Does the TPS259474LRPWR provide reverse current blocking, and how does it work?

Yes, the TPS259474LRPWR provides true reverse current blocking using integrated back-to-back FETs. When VIN < VOUT, the device detects the reverse voltage differential (threshold: –29.3mV typ) and turns off the back-FET within 1µs, preventing any DC reverse current flow from output to input. This behavior is active at all times - including during startup, shutdown, and fault conditions - making the TPS259474LRPWR ideal for ORing and redundant power applications where backfeed must be eliminated.

What is the package type and thermal performance of the TPS259474LRPWR?

The TPS259474LRPWR uses a 2mm × 2mm, 10-pin HotRod™ QFN (RPW) package with exposed thermal pad. Its junction-to-ambient thermal resistance (RθJA) is 41.7°C/W on a custom 4-layer PCB with thermal vias, enabling 5.5A continuous operation at TJ ≤ 125°C with appropriate copper area. The package supports reflow soldering per JEDEC J-STD-020 and is rated for storage from –65°C to +150°C. The TPS259474LRPWR's compact footprint reduces system size while maintaining high thermal efficiency.

Is the TPS259474LRPWR certified for safety-critical applications?

Yes, the TPS259474LRPWR carries UL 2367 recognition (File No. E339631) and IEC 62368-1 CB certification - both validated for end-equipment safety compliance. These certifications cover its overvoltage, overcurrent, thermal, and reverse-polarity protection functions under fault conditions. The TPS259474LRPWR is specified for operation from –40°C to +125°C and supports medical (patient monitor), enterprise storage, and industrial applications where certified fault containment is mandatory.