Texas Instruments TPS75901KCG3

Overview

TPS75901KCG3 from Texas Instruments is an adjustable 7.5-A low-dropout (LDO) voltage regulator in a TO-220 (KC) package, featuring PMOS pass element, 1.22 V internal reference, and open-drain FB/PG terminal for feedback or power-good signaling. It delivers up to 7.5 A with typical dropout of 400 mV at full load and supports output programming from 1.22 V to 5 V using external resistors - ideal for high-current FPGA core supply and multi-rail server power systems.

For engineers reviewing the TPS75901KCG3 datasheet, TPS75901KCG3 pinout, TPS75901KCG3 application, or TPS75901KCG3 equivalent, key selection criteria include its 7.5-A continuous output capability, thermal shutdown protection, 125 µA quiescent current at full load, fast transient response under ±1 A/µs load steps, and compatibility with 47 µF minimum output capacitance with ≥200 mΩ ESR.

Technical Context

The TPS75901KCG3 uses a PMOS pass transistor architecture enabling ultra-low dropout (typically 400 mV at 7.5 A) and load-independent quiescent current (125 µA typ across 1 mA–7.5 A). Its feedback loop is configured via external resistor divider on the FB/PG pin, referencing a stable 1.22 V bandgap.

It integrates UVLO (2.2–2.75 V), overcurrent limiting (~10 A peak), and thermal shutdown (150°C trip, 130°C hysteresis). The EN pin enables active-low logic control with <1 µA standby current, and the FB/PG pin serves dual function: feedback input for adjustable mode or open-drain power-good output for fixed variants - though TPS75901KCG3 uses it exclusively as FB.

Key Specifications

Pinout & Package

TPS75901KCG3 is housed in a 5-pin TO-220 (KC) package with exposed tab for thermal conduction. Mounting requires mechanical fixation and thermal interface to heatsink or PCB copper plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable high-current LDO applications.

Compared with TPS75901KCG3, the KTT variant offers superior thermal performance in SMT layouts, while TPS7A8801RGWR trades current capacity and protection features for ultra-low noise - making them complementary, not drop-in replacements.

Availability

TPS75901KCG3 is available at Aetrix Electronics and suitable for FPGA power delivery, server VRM post-regulation, and industrial PLC I/O modules requiring stable component supply across long production lifecycles.

Supply support for TPS75901KCG3 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 expertise in high-reliability linear regulators and power solutions.

The TPS759xx family was designed specifically for high-current, low-dropout point-of-load regulation in computing, telecom, and industrial systems - emphasizing thermal robustness, fast transient response, and flexible output configurability.

FAQ

What is the maximum output current supported by the TPS75901KCG3?

The TPS75901KCG3 supports up to 7.5 A of continuous output current under recommended operating conditions (TJ ≤ 125°C, adequate heatsinking). Its internal current limit activates at approximately 10 A to prevent damage during short-circuit or overload events. Derating is required above 125°C junction temperature, and thermal design must ensure TJ remains within –40°C to 125°C for reliable operation.

How do I configure the output voltage of the TPS75901KCG3?

The TPS75901KCG3 output voltage is set using an external resistor divider connected between OUTPUT, FB/PG, and GND. With a 1.22 V internal reference, use R2 = 30.1 kΩ for ~40 µA divider current, then calculate R1 = R2 × (VO / 1.22 − 1). For example, for 2.5 V output, R1 ≈ 31.6 kΩ. Avoid high-resistance dividers (>100 kΩ total) to prevent FB leakage-induced error.

Does the TPS75901KCG3 have power-good (PG) functionality?

No - the TPS75901KCG3 is the adjustable variant and uses Pin 5 (FB/PG) exclusively as a feedback input. Power-good functionality is only available on fixed-output versions (e.g., TPS75933KC), where Pin 5 operates as an open-drain, active-low PG output that asserts when VO reaches 91% of nominal. For TPS75901KCG3, external monitoring circuitry is required to implement power-good signaling.

What output capacitor is required for stable operation of the TPS75901KCG3?

The TPS75901KCG3 requires a minimum 47 µF output capacitor with ≥200 mΩ ESR for guaranteed stability. Solid tantalum, aluminum electrolytic, or polymer capacitors meeting these specifications are acceptable. Ceramic capacitors alone are insufficient due to near-zero ESR; if used, they must be paralleled with a higher-ESR bulk capacitor. The product of ESR × Co must be ≥9.4 µΩ·F to remain in the stable region per TI's application curves.

Can the TPS75901KCG3 operate with an input voltage below 2.8 V?

No - the absolute minimum input voltage for TPS75901KCG3 is 2.8 V, as specified in the Absolute Maximum Ratings and Recommended Operating Conditions. Operation below this threshold risks UVLO activation (trip at 2.2–2.75 V) and unregulated output. For sub-2.8 V inputs, consider alternative LDOs such as the TPS7A83A, which supports down to 1.1 V input and 1.2 V output.