Texas Instruments TPS259474ARPWR

Overview

TPS259474ARPWR 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), adjustable overvoltage lockout (OVLO), and circuit-breaker overcurrent protection. It delivers input reverse polarity protection and fast 500ns short-circuit response in server motherboard power rails and USB PD docking stations.

For engineers reviewing the TPS259474ARPWR datasheet, TPS259474ARPWR pinout, TPS259474ARPWR application, or TPS259474ARPWR equivalent, key selection criteria include its 1.2μs OVLO response time, ±10% ILIM accuracy above 1A, auto-retry fault recovery, and QFN-10 HotRod™ package optimized for thermal performance in high-density power MUX designs.

Technical Context

The TPS259474ARPWR implements dual back-to-back MOSFETs to enforce true reverse-current blocking across the full operating range, eliminating DC reverse leakage even during input failure. Its linear ORing scheme maintains <17mV forward drop at 10mA while enabling precise output slew rate control via external dVdt capacitor.

Overvoltage protection uses an adjustable OVLO threshold set by resistor divider on pin 2 (OVLO), triggering shutdown within 1.2μs. Overcurrent response operates in circuit-breaker mode with user-configurable ILIM (0.5–6A) and transient blanking via ITIMER pin - critical for managing inrush without false trips in enterprise storage RAID controllers.

Key Specifications

Pinout & Package

TPS259474ARPWR is housed in a 2mm × 2mm, 10-pin HotRod™ QFN (RPW) package with wettable flanks and an exposed thermal pad. The package supports high-power density layouts and enhanced thermal dissipation in compact PCB footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS259474ARPWR, TPS259470ARPWR offers AUXOFF signaling for MUX coordination but lacks PG/PGTH, while TPS259472ARPWR trades adjustable OVLO for fixed OVC thresholds - making TPS259474ARPWR optimal for systems needing precise, field-tunable overvoltage shutdown with Power Good sequencing.

Availability

TPS259474ARPWR is available at Aetrix Electronics and suitable for server motherboard power rails, USB PD docking stations, and enterprise RAID controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS259474ARPWR 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 90 years of innovation in industrial, automotive, and computing markets.

The TPS25947xx family is designed for high-reliability power path protection in data center, enterprise storage, and medical equipment - emphasizing robust fault response, reverse-current blocking, and compact thermal packaging.

FAQ

What is the overvoltage protection mechanism used in the TPS259474ARPWR?

The TPS259474ARPWR uses adjustable overvoltage lockout (OVLO) - not clamping - with a resistor divider on the OVLO pin (Pin 2) to set the trip threshold between ~1.08V and ~1.22V, corresponding to input voltages up to 23V. When triggered, it shuts down the internal FETs within 1.2μs, disconnecting the output. This differs from the TPS259472x's pin-selectable overvoltage clamp.

Does the TPS259474ARPWR support true reverse current blocking, and how is it implemented?

Yes, the TPS259474ARPWR implements true reverse current blocking using integrated back-to-back N-channel MOSFETs. When VIN < VOUT, the body diodes are reverse-biased and the gate drive circuitry actively turns off both FETs, preventing any reverse current flow - verified down to –29.3mV VIN–VOUT differential. This is fundamental to its use in power MUX and hold-up applications.

What overcurrent protection mode does the TPS259474ARPWR use, and how is the threshold set?

The TPS259474ARPWR operates in circuit-breaker mode, not active current limiting. Its overcurrent threshold (ILIM) is set by an external resistor (RILM) from Pin 9 (ILM) to GND, supporting 0.5A–6A range. At 549Ω, ILIM = 6.068A (typ). Upon sustained overload, it latches off and auto-retries every 110ms - confirmed in the Device Comparison Table and Electrical Characteristics section.

How does the TPS259474ARPWR manage inrush current during power-up?

The TPS259474ARPWR controls inrush via its dVdt pin (Pin 7): connecting a capacitor from this pin to GND slows the output voltage slew rate. With no capacitor, slew rate reaches 44.8 V/ms at 23V input; adding 3300pF reduces it to 0.71 V/ms. This eliminates external soft-start circuitry and allows precise inrush tuning without affecting steady-state regulation.

What certifications apply to the TPS259474ARPWR, and what do they cover?

The TPS259474ARPWR carries UL 2367 recognition (File E339631) for component-level safety and IEC 62368-1 CB certification for audio/video, information, and communication technology equipment. These validate its suitability in safety-critical applications like patient monitors and enterprise servers - specifically covering insulation, flammability, and fault-condition behavior per international standards.