Texas Instruments TPS259461LRPWR

Overview

TPS259461LRPWR from Texas Instruments is a bidirectional eFuse IC for USB OTG power path protection, featuring 2.7–23 V input range, 5.5-A continuous current rating, 28.3-mΩ typical R_ON, adjustable overvoltage lockout (1.2-μs response), and latch-off fault behavior. It integrates back-to-back FETs to enable bidirectional conduction during ON state and full reverse-current blocking during OFF state.

For engineers reviewing the TPS259461LRPWR datasheet, TPS259461LRPWR pinout, TPS259461LRPWR application, or TPS259461LRPWR equivalent, key selection criteria include its latch-off fault response (vs auto-retry), SPLYGD/FLT digital indication scheme, ±10% ILIM accuracy above 1 A, 500-ns short-circuit trip time, and QFN 2 mm × 2 mm HotRod package with thermal vias support.

Technical Context

The TPS259461LRPWR implements dual-FET power path control with independent gate drivers for high-side and backside FETs, enabling true bidirectional current flow in ON state and zero reverse leakage in OFF state. Its protection architecture combines analog current limiting (ILM pin), fast-trip short-circuit detection (500 ns), and digitally configurable thresholds via resistor dividers on EN/UVLO, OVLO, and PGTH/FLT pins.

Unlike auto-retry variants (e.g., TPS259461ARPW), the "L" suffix denotes latch-off behavior: upon overcurrent, overvoltage, or thermal fault, the device shuts down permanently until manually reset via EN/UVLO toggle. It outputs SPLYGD (open-drain supply-good) and FLT (active-low fault) signals-not PG-providing discrete status feedback without threshold adjustment.

Key Specifications

Pinout & Package

TPS259461LRPWR uses a 10-pin QFN (RPW) package with 0.45-mm pitch and exposed thermal pad. The HotRod construction reduces parasitic inductance and improves thermal performance versus standard QFN.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS259461ARPW, the TPS259461LRPWR trades automatic recovery for guaranteed fault isolation; compared with TPS259621RGER, it offers smaller size and lower cost at the expense of current headroom and auxiliary regulation - making it optimal for space-constrained, safety-aware USB OTG endpoints.

Availability

TPS259461LRPWR is available at Aetrix Electronics and suitable for USB On-The-Go, smartphone power management, and point-of-sale terminal designs requiring stable component supply, long-term lifecycle support, and certified safety compliance.

Supply support for TPS259461LRPWR 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 ICs, with decades of expertise in precision power protection and USB interface solutions.

The TPS25946xx family was designed specifically for bidirectional, high-reliability power path control in portable USB-powered devices - emphasizing fast fault response, minimal footprint, and safety certification readiness.

FAQ

What is the fault response behavior of the TPS259461LRPWR?

The TPS259461LRPWR implements latch-off fault response: upon detecting overcurrent, overvoltage, or overtemperature, it permanently disables the power path until the EN/UVLO pin is cycled low-then-high. This prevents uncontrolled retry attempts that could damage downstream circuitry or violate safety requirements in USB OTG host applications. Unlike auto-retry variants, TPS259461LRPWR requires explicit reset to restore operation.

How does the TPS259461LRPWR support bidirectional current flow?

The TPS259461LRPWR integrates back-to-back N-channel MOSFETs in its power path, enabling true bidirectional conduction when enabled. During ON state, current flows freely from IN→OUT (host mode) or OUT→IN (peripheral mode). During OFF state, both FETs block current in either direction - eliminating reverse leakage and protecting batteries or PMICs from backfeed, a critical requirement for USB OTG implementations.

What are the key differences between TPS259461LRPWR and TPS259461ARPW?

The core difference is fault handling: TPS259461LRPWR uses latch-off response, while TPS259461ARPW employs auto-retry with 110-ms interval. Both share identical pinout, R_ON, protection thresholds, and package. TPS259461LRPWR outputs SPLYGD/FLT signals; TPS259461ARPW outputs PG/PGTH. Selection depends on whether system-level fault recovery strategy requires manual intervention (L) or autonomous recovery (A).

Can the TPS259461LRPWR be used for inrush current limiting?

Yes - the TPS259461LRPWR provides programmable inrush control via the dVdt pin: connecting a capacitor from dVdt to GND sets the output voltage slew rate, directly limiting inrush di/dt. With CdVdt = 3300 pF, slew rate drops to 0.71 V/ms at 23 V, holding peak inrush below 2× ILIM. This avoids large input capacitors and eliminates need for external soft-start circuitry in compact USB-powered designs.

What safety certifications apply to the TPS259461LRPWR?

The TPS259461LRPWR carries UL 2367 recognition (File No. E339631) and IEC 62368-1 CB certification. These validate its compliance with end-equipment safety standards for limited-power circuits, including creepage/clearance, fault withstand, and thermal limits. Certification applies to the device itself - not system-level implementation - and supports faster regulatory approval for final products incorporating TPS259461LRPWR.