Texas Instruments TPS74301RGWT

Overview

TPS74301RGWT from Texas Instruments is a 1.5A ultra-low-dropout linear regulator with programmable power-up sequencing via TRACK pin, ±1% output accuracy over line/load/temperature, 55mV typical dropout at 1.5A, and adjustable 0.8V–3.6V output. It supports input as low as 0.9V with external bias and delivers stable regulation for FPGA core/I/O rail sequencing in high-density server power systems.

For engineers reviewing the TPS74301RGWT datasheet, TPS74301RGWT pinout, TPS74301RGWT application, or TPS74301RGWT equivalent, this page provides verified package mapping (RGW QFN-20), confirmed sequencing capability, validated thermal performance (RθJA = 34.7°C/W), real-world transient response data (1.7% droop with 2.2μF COUT), and two field-validated alternative parts for supply chain continuity.

Technical Context

The TPS74301RGWT uses an NMOS pass transistor architecture powered by a dedicated BIAS pin, enabling stable operation with any ≥2.2μF ceramic output capacitor and superior transient response versus PMOS LDOs. Its TRACK pin implements analog voltage tracking for controlled ramping of multiple rails.

It integrates hysteresis and deglitching on the active-high EN pin (VEN(hi) = 1.1V, VEN(lo) = 0.4V), open-drain PG output (only in RGW package), and factory-trimmed current limit (2.0–5.5A). Thermal shutdown activates at 165°C (new chip) with 140°C hysteresis reset.

Key Specifications

Pinout & Package

TPS74301RGWT is housed in a thermally enhanced 5mm × 5mm × 1mm QFN-20 package with exposed thermal pad (PAD/TAB) requiring solder connection to PCB ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-dropout regulator applications.

Compared with TPS74301RGWT, TPS74201RGWT offers lower cost but reduced thermal headroom and sequencing fidelity, while TPS7A8300RGRT delivers lower dropout and higher current but removes critical analog tracking capability-making TPS74301RGWT the sole choice for ESD-safe FPGA power sequencing in enterprise servers.

Availability

TPS74301RGWT is available at Aetrix Electronics and suitable for network attached storage, rack servers, and network interface cards requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS74301RGWT 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 expertise in precision power management ICs.

The TPS743 family was designed specifically for high-reliability, multi-rail sequencing in enterprise computing infrastructure-addressing ESD stress mitigation, ultra-low dropout, and thermal robustness in dense server/NAS environments.

FAQ

What is the minimum input voltage supported by TPS74301RGWT?

The TPS74301RGWT supports input voltages as low as 0.9V when an external bias supply is applied to the BIAS pin. This capability enables direct regulation from low-intermediate bus rails, such as 1.0V or 1.2V sources, provided VBIAS ≥ VOUT + 1.62V and ≥2.375V. Without BIAS, minimum VIN is VOUT + VDO (e.g., ~0.855V for 0.8V output).

Does TPS74301RGWT require an output capacitor for stability?

Yes, the TPS74301RGWT requires a minimum 2.2μF ceramic output capacitor for stable operation. Unlike legacy versions, the new chip variant is not stable with zero output capacitance. The device remains stable with any ≥2.2μF ceramic capacitor-no ESR requirements or specific dielectric types are mandated, simplifying design and BOM selection.

Is the power-good (PG) pin available on all TPS74301RGWT packages?

No-the power-good (PG) pin is available only on the RGW QFN-20 package (TPS74301RGWT). It is not present in the KTW DDPAK-7 package. The PG pin is an open-drain output requiring an external 10kΩ–1MΩ pullup resistor and asserts high-impedance when VOUT ≥ 90% of nominal, providing precise system-level power monitoring and sequencing control.

How does the TRACK pin function in TPS74301RGWT?

The TRACK pin on TPS74301RGWT accepts an external voltage reference (e.g., from a resistor divider off VCCIO) and forces the output voltage to ramp in proportion to that reference. This analog tracking prevents voltage differentials across processor I/O and core power domains, eliminating ESD stress on internal protection structures-a critical feature for modern FPGAs and SoCs in server applications.

What thermal performance can be expected from TPS74301RGWT on a standard PCB?

With proper thermal pad soldering to a 2-layer PCB's internal ground plane, the TPS74301RGWT achieves RθJA = 34.7°C/W. At 1.5A output and 85°C ambient, junction temperature remains at ~137°C-within the 150°C maximum rating. For extended reliability, maintain ≥100mm² copper area under the thermal pad and avoid routing traces beneath the package.