Texas Instruments TPS26635RGET

Overview

TPS26635RGET from Texas Instruments is a 60V, 6A industrial eFuse with integrated 31mΩ hot-swap FET, fixed 39V overvoltage clamp, adjustable current limit (0.6–6A ±7%), analog current monitor (±6%), and fast reverse current blocking (0.17µs). It delivers power limiting, surge protection (IEC 61000-4-5 Class A), and reverse polarity support via external N-FET in PLC I/O modules and motor drive encoder supplies.

For engineers reviewing the TPS26635RGET datasheet, TPS26635RGET pinout, TPS26635RGET application, or TPS26635RGET equivalent, key selection criteria include its 39V fixed OV clamp, 2× pulse overcurrent capability, PLIM-adjustable output power limiting (±6%), PGOOD signaling for DC-DC enable control, and RGE (VQFN-24) thermal performance with 31.4°C/W R_θJA.

Technical Context

The TPS26635RGET implements a dual-stage protection architecture: active current limiting with 2× pulse overcurrent response (configurable via MODE pin), and fixed 39V overvoltage clamp (not adjustable OVP cutoff). Its PLIM input sets output power limit (e.g., 100W at 54V), while B_GATE/DRV pins drive an external N-channel FET for reverse polarity and reverse current blocking.

Thermal regulation activates at 145°C (typical), with shutdown at 165°C and 11°C hysteresis. Fast-trip comparator triggers at 3× I_OL for short-circuit events (<1µs response), and dV/dT-controlled slew rate limits inrush into large capacitive loads using an external capacitor on the dVdT pin.

Key Specifications

Pinout & Package

RGE package: 24-pin VQFN (4.00mm × 4.00mm) with exposed PowerPad™ thermally connected to PCB ground plane for enhanced heat dissipation (R_θJB = 10.2°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS26633RGET, TPS26635RGET offers higher OV clamp headroom for 48V systems, while TPS26636RGET trades pulse robustness for simplified fault handling-making TPS26635RGET optimal for 24V/48V industrial controls needing both surge resilience and energy-limited operation.

Availability

TPS26635RGET is available at Aetrix Electronics and suitable for factory automation, motor drive encoder supplies, and electronic circuit breaker applications requiring stable component supply, long-term industrial lifecycle support, and full traceability.

Supply support for TPS26635RGET 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 and embedded processing technologies, with decades of industrial-grade reliability validation.

The TPS2663x family targets industrial power path protection, delivering integrated surge resilience, programmable power limiting, and reverse-blocking capabilities for PLCs, motor drives, and safety-critical infrastructure.

FAQ

What is the overvoltage protection method implemented in the TPS26635RGET?

The TPS26635RGET uses a fixed 39V overvoltage clamp-not an adjustable cutoff. When input exceeds ~39V, it enters constant-voltage mode to protect downstream circuitry. This differs from TPS26630/31 which use programmable OVP cutoff. The clamp is specified at 35.7–39V (typical 36.6V) with ±6% accuracy across temperature.

How does the TPS26635RGET support reverse polarity protection?

The TPS26635RGET supports reverse polarity protection by driving an external N-channel FET via the B_GATE and DRV pins. When reverse voltage is detected (V_{IN_SYS} – V_OUT < –15mV), the device asserts DRV to pull down the external FET's gate within 0.17µs, blocking reverse current. No internal reverse-blocking FET is present-the external FET is mandatory for this function.

What is the purpose of the PLIM pin on the TPS26635RGET?

The PLIM pin on the TPS26635RGET sets the maximum output power limit by connecting a resistor to GND. For example, a 100kΩ resistor yields ~100W limit at 54V input. This feature enables compliance with IEC 61010-1 energy-limited circuit requirements and prevents thermal runaway in fault conditions. PLIM is specific to TPS26632/33/35/36/37 variants.

Can the TPS26635RGET be used without an external blocking FET?

Yes, the TPS26635RGET operates without an external blocking FET. In that configuration, B_GATE and DRV pins must be left floating, IN_SYS is shorted to IN, and reverse polarity protection is disabled. The device still provides forward-direction current limiting, surge protection, power limiting, and PGOOD functionality-making it suitable for unidirectional 24V/48V supply rails where reverse faults are not anticipated.

What thermal performance can be expected from the TPS26635RGET in a standard 4-layer PCB layout?

In a standard 4-layer PCB with 1-in² 2-oz copper thermal pad connected to the RGE package's PowerPad™, the TPS26635RGET achieves R_θJB = 10.2°C/W. At 6A and 24V input, conduction loss is ~1.1W, resulting in ~12°C junction-to-board rise above ambient-well below the 145°C thermal regulation threshold. Layout adherence to TI's reference design (SLVUEB5) is required to maintain this performance.