Texas Instruments TPS75218QPWP

Overview

TPS75218QPWP from Texas Instruments is a 2-A, 1.8-V fixed-output low-dropout (LDO) voltage regulator with integrated open-drain RESET output, 210-mV dropout at 2 A, 75-μA quiescent current, and thermal shutdown protection in a 20-pin TSSOP PowerPAD™ (PWP) package. It delivers stable power to DSP and FPGA core supplies in telecom infrastructure and server applications.

For engineers reviewing the TPS75218QPWP datasheet, TPS75218QPWP pinout, TPS75218QPWP application, or TPS75218QPWP equivalent, key selection criteria include its 1.8-V ±2% output tolerance over line/load/temperature, 100-ms RESET delay, fast transient response, and compatibility with 47-μF output capacitors having 100-mΩ–10-Ω ESR.

Technical Context

The TPS75218QPWP uses a PMOS pass element enabling ultralow quiescent current (75 μA typical, independent of load) and low dropout (210 mV at 2 A). Its internal 1.1834-V reference and high-gain error amplifier support tight output regulation and fast load transient recovery.

RESET functionality is implemented via an internal comparator monitoring VOUT; it asserts low when output falls below 95% of nominal (1.71 V), with 100-ms delay on release. The device requires no minimum load and supports zero-load stability.

Key Specifications

Pinout & Package

TPS75218QPWP is housed in a thermally enhanced 20-pin TSSOP PowerPAD™ (PWP) package with exposed thermal pad (pins 1, 10, 11, 20) for PCB-level heat sinking. Pin count, layout, and thermal pad connection match TI's standardized PWP footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS75218QPWP, TPS75218QPWPR offers identical performance in tape-and-reel form for manufacturing scalability, while TPS7A4701RGWR trades current capability and RESET functionality for lower noise and quiescent current - making it unsuitable as a direct replacement in DSP/FPGA core supply roles.

Availability

TPS75218QPWP is available at Aetrix Electronics and suitable for telecom line cards, server baseboard management units, and FPGA I/O bank power delivery requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for TPS75218QPWP 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 LDO design heritage and automotive-grade process validation.

The TPS752xxQ product line was engineered specifically for high-current, high-reliability digital core power in telecom and computing infrastructure - emphasizing fast transient response, integrated power-good/reset supervision, and thermally robust packaging.

FAQ

What is the minimum input voltage required for TPS75218QPWP 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. Per datasheet Section 6.5, VIN must also be ≥2.7 V for VOUT ≤1.8 V; however, the TPS75218QPWP is specified to operate down to VIN = 2.7 V regardless of load. Therefore, 2.7 V is the practical minimum input for guaranteed 2-A regulation at 1.8 V. This constraint ensures sufficient headroom for line and load transients.

Does TPS75218QPWP require an external pullup resistor on the RESET pin?

Yes, TPS75218QPWP features an open-drain RESET output (pin 6) that requires an external pullup resistor to a valid logic-high voltage (e.g., 3.3 V or 5 V). The datasheet specifies leakage current ≤1 μA at 5.5 V and output low voltage ≤0.4 V at 1 mA sink, confirming standard open-drain behavior. Typical pullup values range from 10 kΩ to 100 kΩ depending on bus capacitance and rise-time requirements.

Can TPS75218QPWP operate without a minimum load current?

Yes, TPS75218QPWP is explicitly designed for zero-load stability. Section 9.1 of the datasheet states "The TPS752xxQ and TPS754xxQ families are stable even at zero load; no minimum load is required for operation." This eliminates the need for dummy loads or bleed resistors, simplifying designs for standby or burst-mode applications where output current may drop to zero.

What output capacitor specifications are mandatory for stable operation of TPS75218QPWP?

TPS75218QPWP requires a minimum 47-μF output capacitor with ESR between 100 mΩ and 10 Ω. Acceptable types include solid tantalum, aluminum electrolytic, and multilayer ceramic - provided ESR falls within that range. Figure 20 and 21 in the datasheet confirm stability across this ESR window at 2 A. Using capacitors outside this range risks oscillation or degraded transient response.

How does the thermal performance of TPS75218QPWP compare between low-K and high-K PCB layouts?

In a low-K 1-layer board (4 in² copper), TPS75218QPWP dissipates up to 1.9 W at TA = +70°C; on a high-K 8-layer board (6 in² internal planes), it handles 4.6 W at the same ambient. The PWP package's exposed thermal pad must be soldered to the PCB copper - thermal performance scales directly with copper area and layer count. Datasheet Table "Dissipation Ratings" quantifies derating factors per airflow and board construction.