Texas Instruments TPS25940LRVCR

Overview

TPS25940LRVCR from Texas Instruments is a 2.7–18 V eFuse power switch with true reverse current blocking, DevSleep™ mode (95 µA IQ), and adjustable current limit (0.6–5.3 A ±8%). It integrates back-to-back FETs for bidirectional control and supports SATA Device Sleep compliance in SSD power rails.

For engineers reviewing the TPS25940LRVCR datasheet, TPS25940LRVCR pinout, TPS25940LRVCR application, or TPS25940LRVCR equivalent, key selection criteria include its 42 mΩ RON (typ), IMON current monitor output (±8%), programmable dV/dt ramp control, and latched fault response per TPS25940L variant.

Technical Context

The TPS25940LRVCR implements dual internal N-channel MOSFETs in back-to-back configuration to enable true reverse current blocking-triggering shutdown when V(IN) < V(OUT) − 9.3 mV (typ). Its DevSleep mode reduces quiescent current to 95 µA while maintaining fault monitoring via FLT and PGOOD outputs.

Programmable thresholds include EN/UVLO (0.99 V typ), OVP (0.99 V typ), PGTH (0.99 V typ), and ILIM set by external resistor (16.9–150 kΩ). Fault detection covers overvoltage, undervoltage, reverse voltage (1 µs shutoff), thermal shutdown (160°C), and fast-trip overcurrent (I(FASTRIP) = 1.5 × I(LIM) + 0.375 A).

Key Specifications

Pinout & Package

TPS25940LRVCR uses a 20-pin WQFN package (3.00 mm × 4.00 mm) with exposed thermal pad. Pin numbering follows top-view layout; PowerPAD™ must be soldered to PCB ground plane via multiple vias for thermal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS25940ARVCR, the TPS25940LRVCR provides deterministic latched fault behavior essential for safety-critical SSD power management; versus TPS259670RVCR, it delivers unique DevSleep and reverse-blocking capabilities critical for storage-class devices operating at ≤18 V.

Availability

TPS25940LRVCR is available at Aetrix Electronics and suitable for PCIe/SATA SSD drives, enterprise RAID cards, and telecom line cards requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.

Supply support for TPS25940LRVCR 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 TPS25940x family is designed specifically for high-reliability power management in storage systems, emphasizing true reverse blocking, SATA Device Sleep compliance, and robust fault coverage for SSD and enterprise storage applications.

FAQ

What is the function of the DEVSLP pin on the TPS25940LRVCR?

The DEVSLP pin on the TPS25940LRVCR is an active-high input that enables DevSleep™ mode. When driven high, it reduces quiescent current to 95 µA (typ) while maintaining FLT and PGOOD monitoring functionality. This feature is essential for meeting SATA Device Sleep specifications in SSD applications, allowing the TPS25940LRVCR to remain responsive to faults even in ultra-low-power states.

How does the TPS25940LRVCR implement true reverse current blocking?

The TPS25940LRVCR implements true reverse current blocking using internal back-to-back N-channel FETs and a precision comparator that monitors V(IN) − V(OUT). It triggers immediate shutdown when V(IN) falls below V(OUT) − 9.3 mV (typ), achieving 1 µs response time. This prevents backfeed from load-side holdup capacitors into a failed or disconnected input supply-a critical requirement for SSDs and RAID systems with redundant power paths.

What distinguishes the TPS25940LRVCR from the TPS25940ARVCR?

The TPS25940LRVCR and TPS25940ARVCR share identical electrical specifications, pinout, and package, but differ in fault response behavior: TPS25940LRVCR features latched fault mode (FLT remains low until EN/UVLO is cycled), while TPS25940ARVCR auto-retries after a fixed delay. This makes the TPS25940LRVCR preferable for safety-critical SSD applications requiring explicit system-level fault acknowledgment before recovery.

Can the TPS25940LRVCR be used without an external ILIM resistor?

Yes-the TPS25940LRVCR supports open-circuit and short-circuit configurations on the ILIM pin for UL60950 single-point failure testing. With ILIM open, current limit defaults to 0.45 A (typ); with ILIM shorted, it defaults to 0.67 A (typ). However, for precise, adjustable current limiting between 0.6 A and 5.3 A, an external resistor (16.9–150 kΩ) is required. The TPS25940LRVCR datasheet specifies these default values and test conditions explicitly.

What thermal performance can be expected from the TPS25940LRVCR in a standard PCB layout?

In a standard 2-layer PCB layout with 2 oz copper and dedicated ground planes (14 cm² top, 20 cm² bottom), the TPS25940LRVCR achieves a junction-to-board thermal resistance (RθJB) of 13.6°C/W. At 5 A load and 42 mΩ RON, power dissipation is ~1.05 W, resulting in ~14.3°C temperature rise above board temperature. The exposed PowerPAD™ must be connected to the ground plane via ≥6 thermal vias to maintain junction temperature within the −40°C to 125°C operating range.