Texas Instruments TPS25940LQRVCRQ1

Overview

TPS25940LQRVCRQ1 from Texas Instruments is an automotive-grade eFuse power switch with integrated short-to-battery protection, 2.7–18 V input range, 42 mΩ typical R_ON, 0.6–5.3 A adjustable current limit (±8%), and latch-off fault response. It provides reverse current blocking, 1-μs reverse voltage shutoff, programmable dV/dt control, and precise IMON current monitoring - deployed in ADAS camera modules for supply bus isolation during output short-to-battery faults.

For engineers reviewing the TPS25940LQRVCRQ1 datasheet, TPS25940LQRVCRQ1 pinout, TPS25940LQRVCRQ1 application, or TPS25940LQRVCRQ1 equivalent, key selection criteria include latch-off behavior under overcurrent, ±2% programmable UV/OV thresholds, short-to-battery detection logic, thermal shutdown at 160°C, and WQFN-20 package compatibility with automotive PCB layout constraints.

Technical Context

The TPS25940LQRVCRQ1 integrates back-to-back FETs to enable true bidirectional current control and reverse current blocking when V_IN < (V_OUT – 66 mV). Its fault detection architecture includes fast-trip comparator (200 ns delay), thermal shutdown (160°C threshold, 12°C hysteresis), and independent UVLO/OVP comparators with ±2% accuracy.

Control is implemented via resistor-programmable ILIM (16.9–150 kΩ), capacitor-programmable dV/dt ramp rate, and dedicated EN/UVLO, OVP, PGTH, and DEVSLP pins. Fault signaling uses open-drain FLT (active-low) and PGOOD (active-high) outputs, while IMON delivers a scaled analog current (52.3 µA/A) for real-time load monitoring.

Key Specifications

Pinout & Package

TPS25940LQRVCRQ1 is housed in a thermally enhanced 20-pin WQFN package (3.0 mm × 4.0 mm, 0.75 mm height) with exposed thermal pad connected to PCB ground plane via multiple vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS25940QRVCRQ1, the TPS25940LQRVCRQ1 avoids uncontrolled restarts during persistent faults - critical for ADAS compliance - while TPS259401AQRVCRQ1 trades monitoring fidelity and protection granularity for reduced conduction loss budget and bill-of-materials simplicity.

Availability

TPS25940LQRVCRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera systems, and USB power distribution requiring stable component supply with AEC-Q100 Grade 1 assurance and full production traceability.

Supply support for TPS25940LQRVCRQ1 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 with deep automotive qualification expertise and broad production infrastructure.

The TPS25940xx-Q1 product line was designed specifically for automotive power distribution networks requiring robust fault containment, bidirectional protection, and ASIL-ready behavior in infotainment, ADAS, and body electronics subsystems.

FAQ

What is the fault response behavior of the TPS25940LQRVCRQ1 during overcurrent events?

The TPS25940LQRVCRQ1 implements latch-off fault response: upon detecting overcurrent, it immediately disables the internal FETs and holds the output off until the EN/UVLO pin is cycled low-then-high or the device is power-cycled. This prevents uncontrolled auto-retry that could exacerbate faults in safety-critical automotive systems like ADAS cameras or radar sensors - a key distinction from the auto-retry TPS25940QRVCRQ1 variant.

How does the TPS25940LQRVCRQ1 provide short-to-battery protection?

The TPS25940LQRVCRQ1 monitors V_IN and V_OUT simultaneously and triggers FLT assertion within 2 µs when V_OUT exceeds V_IN by more than 66 mV - indicating an output short to battery. It then opens both internal back-to-back FETs to isolate the faulted load from the main supply bus, preventing bus collapse and protecting upstream power sources. This function is explicitly validated in the datasheet for automotive short-to-battery fault conditions.

What is the accuracy and temperature stability of the IMON current monitor in the TPS25940LQRVCRQ1?

The TPS25940LQRVCRQ1 provides ±8% IMON accuracy across –40°C to +125°C ambient temperature and 1–5 A load current range. Its gain is specified as 52.3 µA/A (typical), with measured variation of less than ±1% over temperature (Figure 7-25). This enables reliable analog current sensing without external calibration - critical for diagnostic logging in automotive ECUs using the TPS25940LQRVCRQ1.

Can the TPS25940LQRVCRQ1 be used in bidirectional power architectures?

Yes - the TPS25940LQRVCRQ1 integrates back-to-back FETs enabling true bidirectional current control. It blocks reverse current when V_IN < (V_OUT – 66 mV) with 10 µs response time, and supports power muxing between primary and backup supplies. This makes it suitable for holdup power management in telematics gateways and USB-C dual-role ports where controlled source switchover and reverse leakage prevention are required.

What package and thermal characteristics define the TPS25940LQRVCRQ1 layout requirements?

The TPS25940LQRVCRQ1 uses a 20-pin WQFN package (3.0 mm × 4.0 mm) with exposed thermal pad. Its junction-to-board thermal resistance is 13.6°C/W, requiring direct connection of the thermal pad to a multilayer PCB ground plane via ≥6 thermal vias. Layout must maintain ≥0.2 mm clearance from GND to all signal pins and place C_IN/C_OUT within 3 mm of respective IN/OUT pins to ensure stable operation under automotive transients.