Texas Instruments TPS22945DCKRG4

Overview

TPS22945DCKRG4 from Texas Instruments is a low-input-voltage, current-limited P-channel load switch in SC70-5 package, providing overcurrent, undervoltage, and thermal protection for 1.62 V–5.5 V systems. It features 100 mA minimum current limit, 0.5 Ω ON-resistance at 3.3 V input, active-high ON control with 1.4 V logic threshold, and open-drain OC fault flag. It is used in HDMI port protection and peripheral power sequencing where precise current limiting and auto-restart recovery are required.

For engineers reviewing the TPS22945DCKRG4 datasheet, TPS22945DCKRG4 pinout, TPS22945DCKRG4 application, or TPS22945DCKRG4 equivalent, key selection criteria include its 100 mA current limit with 10 ms blanking time, 80 ms auto-restart interval, <1 μA shutdown current, and compatibility with 1.8-V control signals-critical for space-constrained portable power rail management.

Technical Context

The TPS22945DCKRG4 integrates a P-channel MOSFET with precision current-limit sensing and fault-handling logic. Its constant-current mode activates when output load exceeds 100 mA, and it asserts OC low during overcurrent, UVLO (1.42 V threshold), or thermal shutdown (140 °C). Unlike TPS22943/4, it includes both fault blanking (10 ms) and auto-restart (80 ms), enabling self-recovery after transient faults without host intervention.

Control is active-high with VIH = 1.4 V at 3.3 V VIN and VIL = 0.8 V, ensuring reliable interfacing with 1.8-V GPIOs. The device operates across –40°C to 85°C ambient, with junction-to-ambient thermal resistance of 294 °C/W in SC70-5, requiring careful PCB copper area design for thermal management under sustained 100 mA loads.

Key Specifications

Pinout & Package

TPS22945DCKRG4 is housed in a 2.00 mm × 2.10 mm SC70-5 (DCK) surface-mount package with gull-wing leads, optimized for high-density portable PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS22942DCKR, TPS22945DCKRG4 offers native active-high control matching typical MCU GPIO defaults; compared with TPS22965DSGR, it delivers integrated fault detection and recovery essential for low-power peripheral protection-not just raw switching capacity.

Availability

TPS22945DCKRG4 is available at Aetrix Electronics and suitable for HDMI connector protection, notebook peripheral port management, and GPS module power sequencing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS22945DCKRG4 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.

The TPS2294x family was designed specifically for low-voltage, current-limited load switching in space-constrained portable electronics-emphasizing ultra-low quiescent current, fast fault response, and seamless integration with 1.8-V logic domains.

FAQ

What is the current limit threshold of the TPS22945DCKRG4?

The TPS22945DCKRG4 has a minimum current limit of 100 mA at VIN = 3.3 V and VOUT = 3 V, with typical values up to 150 mA and maximum up to 200 mA across temperature. This threshold is factory-trimmed and remains stable over –40°C to 85°C ambient, enabling predictable fault containment in portable power rails without external sensing components.

Does the TPS22945DCKRG4 support active-high or active-low enable control?

The TPS22945DCKRG4 uses active-high ON control with VIH = 1.4 V at 3.3 V VIN and VIL = 0.8 V, making it directly compatible with 1.8-V GPIO outputs. This differs from TPS22941/2 (active-low ON) and TPS22943/4 (active-high but no auto-restart), confirming TPS22945DCKRG4 as the only variant combining active-high enable with blanking + auto-restart functionality.

How does the OC pin behave during an overcurrent event on the TPS22945DCKRG4?

During overcurrent, the OC pin of the TPS22945DCKRG4 asserts low after a 10 ms blanking period and remains low until the fault clears. If the condition persists beyond blanking time, the device shuts off and restarts after 80 ms-reasserting OC low again if the fault remains. OC is open-drain and requires an external pull-up resistor to a valid voltage rail (e.g., VIN) for proper logic-level signaling.

What is the ON-state resistance of the TPS22945DCKRG4 at 1.8 V input?

At VIN = 1.8 V, the TPS22945DCKRG4 exhibits an ON-state resistance of 0.8 Ω (typical) to 1.1 Ω (max) across temperature. This results in ≤110 mV voltage drop at 100 mA load, preserving regulation margin in 1.8-V domain applications such as sensor or RF subsystems where headroom is critical.

Is the TPS22945DCKRG4 compliant with safety standards for end equipment?

Yes, the TPS22945DCKRG4 is UL Recognized (UL File 169910) and evaluated to IEC 60950-1, Ed 2, Am1, Annex CC, Test Program 2 with CB Report. These certifications validate its suitability for incorporation into certified consumer and industrial portable devices without requiring additional isolation or protection circuitry.