Texas Instruments TPS75125QPWP

Overview

TPS75125QPWP from Texas Instruments is a 1.5-A, 2.5-V fixed-output low-dropout (LDO) voltage regulator with integrated power-good (PG) output, 160-mV dropout at 1.5 A, 75-μA quiescent current, and thermal shutdown protection in a 20-pin TSSOP PowerPAD™ (PWP) package. It delivers stable power to DSPs, FPGAs, and telecom baseband processors requiring fast transient response and precise voltage regulation.

For engineers reviewing the TPS75125QPWP datasheet, TPS75125QPWP pinout, TPS75125QPWP application, or TPS75125QPWP equivalent, this page provides verified technical context, validated pin functions, confirmed 2.5-V output tolerance (±2%), PG timing behavior (83% VOUT trip), and real-world design implications for battery-powered and thermally constrained systems.

Technical Context

The TPS75125QPWP uses a PMOS pass element enabling ultralow dropout (160 mV @ 1.5 A) and load-independent quiescent current (75 μA typ). Its internal 1.1834-V reference and high-gain error amplifier support ±2% output accuracy over line, load, and temperature (–40°C to +125°C).

It integrates an open-drain power-good (PG) output that asserts high-impedance when VOUT reaches 83% of nominal (2.075 V), with 0.5% hysteresis. The EN pin enables active-low logic control, reducing standby current to <1 μA, and GND/HEATSINK pins (pins 1, 10, 11, 20) provide direct thermal path to PCB copper.

Key Specifications

Pinout & Package

TPS75125QPWP is housed in a thermally enhanced 20-pin TSSOP PowerPAD™ (PWP) package with an exposed copper thermal pad (pins 1, 10, 11, 20) that must be soldered to a dedicated PCB copper pour for effective heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS75125QPWP, TPS75125QPWPR offers identical performance in volume-friendly packaging, while TPS76725QPWP trades 0.5-A current headroom and higher dropout for legacy footprint compatibility - neither is pin-compatible, but both serve adjacent 2.5-V LDO roles in cost- or volume-sensitive designs.

Availability

TPS75125QPWP is available at Aetrix Electronics and suitable for telecom infrastructure, server management, and DSP/FPGA power delivery requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS75125QPWP 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 technologies, with decades of LDO design expertise and broad automotive/industrial qualification.

The TPS751xxQ family was engineered for high-current, low-noise, fast-transient power delivery in DSP, FPGA, and telecom baseband applications - emphasizing thermal robustness, precision regulation, and integrated power sequencing.

FAQ

What is the minimum input voltage required for TPS75125QPWP to regulate 2.5 V at 1.5 A?

The minimum input voltage is calculated as VOUT + VDO(max) = 2.5 V + 0.3 V = 2.8 V (using max dropout of 300 mV per datasheet). However, the absolute minimum specified VIN is 2.7 V. For reliable 1.5-A operation, TI recommends VIN ≥ 2.8 V to maintain regulation margin across temperature and process variation. TPS75125QPWP will not sustain 2.5 V output below this threshold.

How does the power-good (PG) output of TPS75125QPWP behave during power-up and brownout?

The PG output of TPS75125QPWP is an open-drain, active-high signal. It remains low-impedance (pulled low) until VOUT reaches 83% of 2.5 V (2.075 V), then transitions to high-impedance after internal stabilization. During brownout, PG reasserts low-impedance when VOUT falls below 2.075 V - with 12.5-mV hysteresis (0.5% of 2.5 V) preventing oscillation near the threshold. An external pullup resistor is mandatory.

Can TPS75125QPWP be used with ceramic output capacitors, and what ESR range is acceptable?

Yes, TPS75125QPWP supports multilayer ceramic capacitors (MLCCs) provided they meet the 47-μF minimum capacitance and 100-mΩ to 10-Ω ESR requirement. MLCCs with ESR <100 mΩ may cause instability unless compensated per TI Application Report SLVA399. TI validates stability with 47-μF solid tantalum (typical ESR ~500 mΩ); for ceramics, parallel damping resistors or larger bulk capacitance may be needed.

What is the role of the GND/HEATSINK pins (1, 10, 11, 20) on TPS75125QPWP, and are they electrically isolated?

The GND/HEATSINK pins on TPS75125QPWP are internally connected to the die substrate and must be soldered to a common PCB ground plane - they are not electrically isolated. These four pins provide the primary thermal conduction path from the die to the board. Leaving them unconnected or floating violates thermal specifications and risks premature thermal shutdown at currents >500 mA. TI specifies 1.9 W max power dissipation only when all four are properly soldered to ≥4 in² of 1-oz copper.

Does TPS75125QPWP support reverse current protection, and how does it behave during input undervoltage?

TPS75125QPWP incorporates reverse-current blocking via its PMOS pass transistor body diode orientation, preventing current flow from OUTPUT to IN when VIN < VOUT (e.g., during power-down). However, if VIN collapses rapidly while VOUT remains charged, the body diode conducts reverse current - not internally limited. For applications with sustained reverse bias risk (e.g., hot-swap), an external Schottky diode in series with IN is recommended to prevent uncontrolled discharge of downstream capacitance through TPS75125QPWP.