Texas Instruments TPS2041DG4

Overview

TPS2041DG4 from Texas Instruments is a 135-mΩ N-channel high-side power distribution switch with active-low enable, 500 mA continuous current rating, 0.9-A current limit at 25°C, and integrated short-circuit/thermal protection with open-drain OC output. It operates from 2.7 V to 5.5 V and is used in USB host/port power management to control hot-plug inrush and prevent bus overloads.

For engineers reviewing the TPS2041DG4 datasheet, TPS2041DG4 pinout, TPS2041DG4 application, or TPS2041DG4 equivalent, key selection considerations include its logic-level active-low EN input, 2.5-ms typical rise time, 10 µA standby supply current, undervoltage lockout (~2 V), and SOIC-8 package compatibility with USB 2.0 power delivery requirements.

Technical Context

The TPS2041DG4 integrates an N-channel MOSFET high-side switch with internal charge pump gate drive, enabling operation down to 2.7 V while maintaining controlled 2.5–4.4 ms rise/fall times to suppress EMI during capacitive load switching. Its current-sense FET architecture enables precise 0.9-A trip threshold without external sensing resistors.

Thermal shutdown activates at ~140°C junction temperature with ~20°C hysteresis, and undervoltage lockout disables the switch below ~2 V input. The OC pin provides open-drain fault signaling for USB controller monitoring, and bidirectional blocking prevents reverse current flow when disabled.

Key Specifications

Pinout & Package

TPS2041DG4 is housed in an 8-pin SOIC (D) package with 1.27-mm pitch, RoHS-compliant lead finish, and thermal resistance θ_JA = 172°C/W. Pin 1 is GND; pins 2 and 3 are parallel IN inputs; pin 4 is active-low EN; pins 6–8 are paralleled OUT outputs; pin 5 is open-drain OC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side power switch applications.

Compared with TPS2041D, TPS2041DG4 offers identical performance with enhanced environmental compliance; compared with AP2151WG-7, it trades lower on-resistance for critical USB-required OC reporting and 5.5-V input support-making TPS2041DG4 the sole choice for standards-compliant USB power switching.

Availability

TPS2041DG4 is available at Aetrix Electronics and suitable for USB host controllers, self-powered hubs, bus-powered peripherals, industrial hot-swap modules, and embedded 5-V power distribution systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS2041DG4 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 USB interface solutions and high-reliability power switches.

The TPS2041DG4 belongs to TI's power-distribution switch product line, designed specifically for USB-compliant hot-plug power control, inrush limiting, and per-port fault protection in host, hub, and peripheral applications.

FAQ

What is the enable polarity and logic threshold for TPS2041DG4?

The TPS2041DG4 features an active-low enable (EN) input compatible with TTL and CMOS logic. A logic low (≤0.4 V at 2.7–4.5 V input, ≤0.8 V at 4.5–5.5 V) turns the switch ON; a logic high disables the device and reduces supply current to ≤10 µA. This polarity aligns directly with USB host controller GPIO configurations requiring simple pull-down or open-drain drive.

Does TPS2041DG4 support bidirectional current flow?

No, the TPS2041DG4 is a unidirectional high-side N-channel MOSFET switch configured to block reverse current (from OUT to IN). When disabled, it prevents backfeeding from downstream loads-a critical safety feature in USB VBUS distribution where reverse current could damage upstream sources or violate specification limits.

How does the OC pin behave during a short-circuit event on TPS2041DG4?

During a short circuit, the TPS2041DG4 enters constant-current mode at ~0.9 A and asserts the OC pin low within microseconds. The OC remains low until the fault is cleared and the device recovers-either thermally (after cooling from ~140°C) or electrically (once load current drops below trip threshold). An external pull-up resistor is required to interface with USB controller interrupt inputs.

What is the maximum allowable power dissipation for TPS2041DG4 in SOIC-8 package at 70°C ambient?

At TA = 70°C, the SOIC-8 package (θ_JA = 172°C/W) allows 464 mW maximum power dissipation per TI's Dissipation Rating Table. With R_DS(on) = 135 mΩ and I_OUT = 500 mA, P_D = 338 mW - safely within limit. Junction temperature would reach ~148°C (70°C + 338 mW × 172°C/W), remaining below the 125°C recommended max TJ under continuous operation with proper PCB copper area.

Can TPS2041DG4 be used with a 3.3-V input supply?

Yes, the TPS2041DG4 operates across 2.7 V to 5.5 V, including 3.3-V rails. At 3.3 V, R_DS(on) increases to ≤150 mΩ (125°C), resulting in ≤75 mV dropout at 500 mA. Rise time extends to ~3 ms, still compliant with USB inrush control requirements. The charge pump ensures reliable gate drive even at minimum input voltage.