Texas Instruments TPS75901KC

Overview

TPS75901KC from Texas Instruments is an adjustable 7.5-A low-dropout linear voltage regulator in a 5-pin TO-220 (KC) package, featuring PMOS pass element, 1.22 V internal reference, and open-drain enable control. It delivers up to 7.5 A output current 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 or multi-rail server power subsystems.

For engineers reviewing the TPS75901KC datasheet, TPS75901KC pinout, TPS75901KC application, or TPS75901KC equivalent, key selection criteria include its 7.5-A continuous output capability, thermal shutdown protection, fast transient response under ±1 A/µs load steps, and compatibility with standard 47 µF–100 µF output capacitors with ≥200 mΩ ESR.

Technical Context

The TPS75901KC uses a PMOS pass transistor architecture enabling ultra-low quiescent current (125 µA typical across 1 mA–7.5 A load) and dropout voltage directly proportional to output current. Its feedback (FB) pin accepts a resistor divider to set output voltage, with internal 1.22 V reference and ±2% tolerance over –40°C to 125°C junction temperature.

Enable (EN) is active-low logic input; assertion of EN < 0.7 V enables regulation, while EN > 2 V places device in sleep mode (<10 µA standby current). Power-good functionality is not implemented on the adjustable TPS75901KC - FB/PG pin serves exclusively as feedback input, unlike fixed-output variants where it functions as open-drain PG output.

Key Specifications

Pinout & Package

TPS75901KC is housed in a 5-pin TO-220 (KC) package with exposed tab thermally connected to GND. The package requires mechanical mounting to a heatsink for operation above ~2.4 W dissipation (e.g., 3 A @ 0.8 V dropout).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS75901KC, TPS75733KTT offers integrated power-good signaling but sacrifices adjustability and current capacity, while LT3080IPK provides broader voltage range in compact form but cannot support >1.1 A - making TPS75901KC uniquely suited for high-current, programmable, thermally robust LDO requirements.

Availability

TPS75901KC is available at Aetrix Electronics and suitable for high-current FPGA core supply, industrial PLC CPU power, and test equipment power module applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS75901KC 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 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 demanding industrial, computing, and communications infrastructure - emphasizing thermal robustness, transient performance, and design flexibility through adjustable output.

FAQ

What is the maximum output current supported by the TPS75901KC?

The TPS75901KC supports a continuous output current of 7.5 A under proper thermal management. This rating assumes adequate heatsinking to maintain junction temperature below 125°C. Internal current limiting activates at approximately 10 A to prevent damage during short-term overload events, but sustained operation above 7.5 A requires verification of thermal design per the R_θJA = 58.7°C/W specification for the TO-220 package.

Can the TPS75901KC be used as a fixed-output regulator without external resistors?

No, the TPS75901KC is exclusively an adjustable regulator and requires an external resistor divider connected between OUTPUT, FB/PG, and GND to set the output voltage. Unlike fixed-output variants (e.g., TPS75933KC), it does not have internal feedback resistors. Connecting FB/PG directly to OUTPUT yields the minimum output of 1.22 V, matching the internal bandgap reference - any other voltage requires precise R1/R2 calculation per VO = 1.22 × (1 + R1/R2).

Does the TPS75901KC provide power-good (PG) status indication?

No, the TPS75901KC does not implement power-good functionality. Pin 5 (FB/PG) serves solely as the feedback input for output voltage programming. Fixed-output members of the TPS759xx family (e.g., TPS75933KC) repurpose this pin as an open-drain, active-low PG output, but the TPS75901KC variant omits PG circuitry entirely - confirmed by functional block diagrams and pin descriptions in the official datasheet.

What is the recommended output capacitor for stable operation of the TPS75901KC?

The TPS75901KC requires a minimum output capacitance of 47 µF with an equivalent series resistance (ESR) of at least 200 mΩ for guaranteed stability. Ceramic, tantalum, and aluminum electrolytic capacitors are acceptable if they meet these criteria. TI's stability analysis shows that combinations satisfying Co × ESR ≥ 9.4 µV·s (e.g., 100 µF × 100 mΩ or 47 µF × 200 mΩ) fall within the stable region - undersized or ultra-low-ESR ceramics without added series resistance may cause oscillation.

How does the enable (EN) pin function on the TPS75901KC?

The EN pin on the TPS75901KC is an active-low logic input: pulling EN below 0.7 V enables regulation, while driving EN above 2 V disables the device into sleep mode with standby current <10 µA. The pin has TTL-compatible thresholds and draws <1 µA leakage current in either state. No external pull-up or pull-down is required, but a weak pull-down is recommended in systems where EN might float during power-up to ensure predictable startup behavior.