Texas Instruments TPS75418QPWP

Overview

TPS75418QPWP from Texas Instruments is a 1.8 V fixed-output, 2-A low-dropout (LDO) voltage regulator with open-drain power-good (PG) output, 210 mV dropout at 2 A, 75 μA quiescent current, and thermal shutdown protection - designed for high-current FPGA core supplies in telecom infrastructure and server power rails.

For engineers reviewing the TPS75418QPWP datasheet, TPS75418QPWP pinout, TPS75418QPWP application, or TPS75418QPWP equivalent, this page delivers verified electrical specs, validated 20-pin TSSOP PowerPAD™ package mapping, confirmed PG timing behavior (83% trip threshold, 100-ms delay), and two field-validated alternative LDOs for 1.8 V/2 A systems.

Technical Context

The TPS75418QPWP uses a PMOS pass element enabling ultralow quiescent current (75 μA full-load, <1 μA shutdown) independent of output current - critical for battery-backed or always-on subsystems. Its fast transient response is achieved via high-gain error amplifier and optimized internal compensation, supporting rapid load steps up to 2 A without external compensation.

Unlike NMOS-based LDOs, the PMOS architecture eliminates reverse-current conduction during input droop but requires external pull-up on the open-drain PG pin. The SENSE pin enables remote sensing for improved regulation accuracy under PCB trace IR drop, while thermal shutdown activates at +150°C with automatic recovery at +130°C.

Key Specifications

Pinout & Package

TPS75418QPWP is housed in a thermally enhanced 20-pin TSSOP PowerPAD™ (PWP) package with exposed thermal pad (pins 1, 10, 11, 20) 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 1.8 V/2 A LDO applications.

Compared with TPS75418QPWP, TPS75218QPWP offers identical regulation and thermal performance but differs in fault signaling polarity and threshold, while TPS7A8300RGRT trades PG integration for lower dropout and compact packaging - making TPS75418QPWP optimal where robust, self-contained power sequencing is required.

Availability

TPS75418QPWP is available at Aetrix Electronics and suitable for telecom line cards, server CPU core rails, and industrial DSP power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS75418QPWP 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 TPS754xxQ family was engineered specifically for high-current, low-noise point-of-load regulation in telecom and computing infrastructure - emphasizing thermal robustness, fast transient immunity, and integrated power-status signaling.

FAQ

What is the minimum input voltage required for TPS75418QPWP to regulate 1.8 V at 2 A?

The minimum input voltage is calculated as VOUT + VDO = 1.8 V + 0.21 V = 2.01 V. However, per datasheet recommended operating conditions, VIN must be ≥2.8 V for 1.8 V output to ensure stability and specified performance across temperature and load. Below 2.8 V, dropout behavior remains valid but line regulation and PSRR may degrade.

Does TPS75418QPWP require an external pull-up resistor on the PG pin?

Yes, TPS75418QPWP's PG pin is an open-drain output and requires an external pull-up resistor to a valid logic-high voltage (e.g., 3.3 V or 5 V). Typical values range from 10 kΩ to 100 kΩ; lower values improve noise immunity but increase static current. The datasheet specifies leakage current ≤1 μA when PG is high-impedance.

Can TPS75418QPWP operate without a minimum load current?

Yes, TPS75418QPWP is stable at zero load. The datasheet explicitly states "no minimum load is required for operation," unlike many older LDOs that demand 1–5 mA to maintain loop stability. This enables use in ultra-low-power sleep states where downstream circuitry may be fully powered down.

What thermal performance can be expected from TPS75418QPWP in a standard 4-layer PCB?

With the recommended 6-in² copper heatsink on inner layers (per TI technical brief SLMA002), TPS75418QPWP achieves 57.9 mW/°C derating and supports 3.8 W continuous dissipation at +85°C ambient (300 CFM airflow). Without airflow, derating drops to 23.8 mW/°C, limiting usable power to ~1.5 W at +85°C - sufficient for most 2 A loads at modest VIN–VOUT differentials.

How does the SENSE pin function in TPS75418QPWP, and must it be used?

In TPS75418QPWP (fixed-output version), the SENSE pin is internally connected to the OUTPUT pin and must be routed directly to the same net - typically via short, low-impedance trace. It enables remote sensing to compensate for voltage drop between the LDO output pins and the load, improving regulation accuracy at point-of-load. Leaving it unconnected violates layout guidelines and risks instability.