Texas Instruments TPS75501KTTR

Overview

TPS75501KTTR from Texas Instruments is an adjustable 5-A low-dropout (LDO) voltage regulator in TO-263 (KTT) surface-mount package, featuring PMOS pass element, 125 µA typical quiescent current at full load, 250 mV typical dropout at 5 A (for 3.3-V variant), and integrated enable (EN) and feedback (FB) terminals. It delivers stable output from 1.22 V to 5 V in high-current industrial power rails and FPGA core supplies.

For engineers reviewing the TPS75501KTTR datasheet, TPS75501KTTR pinout, TPS75501KTTR application, or TPS75501KTTR equivalent, key selection criteria include programmable output range (1.22–5 V), thermal shutdown protection, open-drain PG compatibility (in fixed variants), fast transient response under 5-A load steps, and TO-263 thermal performance with external copper heatsinking.

Technical Context

The TPS75501KTTR implements a PMOS-based LDO architecture with bandgap reference (1.22 V typ), enabling ultra-low dropout and load-independent quiescent current. Its EN input supports TTL-level shutdown, reducing ground current to <1 µA, while FB terminal allows precise output programming via external resistor divider.

It features internal current limiting (~10 A peak), thermal shutdown at ~150°C, and UVLO activation at 2.2–2.75 V input. Unlike fixed-output variants, it omits the power-good (PG) function-FB/PG pin serves exclusively as feedback input, not an active status output.

Key Specifications

Pinout & Package

TPS75501KTTR is housed in a 5-pin TO-263 (KTT) thermally enhanced surface-mount package with exposed tab connected to GND. The tab must be soldered to a large copper pour for effective heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS75501KTTR, TPS75501KTTR offers full 1.22–5 V adjustability and 5-A capability ideal for modern high-density power domains, whereas TPS75733KTTR trades adjustability for built-in PG signaling, and LM3940IT-5.0/NOPB provides basic fixed regulation at lower current and thermal performance.

Availability

TPS75501KTTR is available at Aetrix Electronics and suitable for industrial PLCs, FPGA development platforms, medical imaging subsystems, and automated test equipment requiring stable component supply with long-term manufacturability.

Supply support for TPS75501KTTR 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 TPS755xx family was designed for high-current, low-noise, thermally robust point-of-load regulation in industrial, medical, and test equipment - emphasizing dropout efficiency, transient immunity, and ruggedized packaging.

FAQ

What output voltage range does the TPS75501KTTR support?

The TPS75501KTTR supports an output voltage range of 1.22 V to 5 V, set by an external resistor divider connected to the FB pin. The internal bandgap reference is 1.22 V (typ), and output accuracy is ±3% over line, load, and temperature. It cannot operate below 1.22 V or above 5 V - those limits are enforced by the reference and absolute maximum ratings.

Does the TPS75501KTTR include a power-good (PG) output?

No, the TPS75501KTTR does not include a power-good output. As the adjustable variant of the TPS755xx family, its Pin 5 is designated FB (feedback input) only. Fixed-output versions (e.g., TPS75533KTTR) use Pin 5 as an open-drain PG output, but TPS75501KTTR repurposes that pin exclusively for voltage programming - no PG functionality is implemented in this part.

What is the recommended output capacitor for stable operation of the TPS75501KTTR?

The TPS75501KTTR requires a minimum 47 µF output capacitor with low ESR (e.g., ceramic or polymer). TI's datasheet specifies Co = 100 µF for characterization, and Figures 19–20 define stability regions based on capacitor ESR vs. output current. Using <47 µF or high-ESR electrolytics risks oscillation; 680 µF aluminum with ~15 mΩ ESR falls within the stable region for 5-A loads.

How does the enable (EN) pin function on the TPS75501KTTR?

The EN pin on the TPS75501KTTR is active-low: applying ≤0.7 V enables regulation, while ≥2 V disables it, reducing quiescent current to <1 µA. EN is TTL-compatible and internally pulled down; no external pull-down is needed. During disable, the output discharges through an internal 10–25 mA transistor - useful for controlled power-down but requires load-side isolation if backfeed is prohibited.

Can the TPS75501KTTR be used in place of a fixed-output TPS75533KTTR?

No - the TPS75501KTTR cannot directly replace the TPS75533KTTR because it lacks the integrated power-good (PG) output and requires external resistors to set voltage. While both share the same TO-263 package and 5-A rating, substituting TPS75501KTTR would require redesigning the feedback network and forfeiting PG signaling. They serve distinct design roles: fixed vs. adjustable regulation with different feature sets.