Texas Instruments TPS75533KTTRG3

Overview

TPS75533KTTRG3 from Texas Instruments is a 5-A, 3.3-V fixed-output low-dropout (LDO) voltage regulator in TO-263 (KTT) surface-mount package, featuring open-drain power-good (PG) output, 250 mV typical dropout at 5 A, 125 µA quiescent current, and ±3% output voltage tolerance over line, load, and temperature. It enables efficient 5-V-to-3.3-V conversion in high-current digital power rails.

For engineers reviewing the TPS75533KTTRG3 datasheet, TPS75533KTTRG3 pinout, TPS75533KTTRG3 application, or TPS75533KTTRG3 equivalent, key selection criteria include dropout performance at full load, thermal behavior in TO-263 layout, PG timing hysteresis (0.5%VO), and compatibility with 100 µF output capacitance for fast transient response in FPGA/ASIC core supplies.

Technical Context

The TPS75533KTTRG3 uses a PMOS pass element to achieve low dropout and load-independent quiescent current. Its bandgap reference (1.22 V) feeds an error amplifier that controls the pass device, delivering regulated 3.3 V with fast load transient recovery (±100 mV deviation under 5-A step with 1.25 A/µs slew rate).

Power-good logic monitors output voltage with 89–93%VO trip thresholds and 0.5%VO hysteresis; EN input supports TTL-compatible shutdown (<0.7 V low, >2 V high), reducing quiescent current to <1 µA. Thermal shutdown activates at 150°C with automatic recovery at ~130°C.

Key Specifications

Pinout & Package

TPS75533KTTRG3 is housed in a TO-263-5 (KTT) thermally enhanced surface-mount package with exposed tab electrically connected to GND. The tab serves as primary thermal path to PCB copper plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS75533KTTRG3, TPS75533KTT offers identical performance but non-RoHS packaging, while TPS7A4701RGWR trades 5-A capacity and PG functionality for nanoscale IQ and noise-making it unsuitable as a direct replacement in high-current digital power applications.

Availability

TPS75533KTTRG3 is available at Aetrix Electronics and suitable for industrial automation, FPGA power management, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS75533KTTRG3 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.

The TPS755xx family was designed for high-current, low-dropout regulation in space-constrained industrial and automotive systems where thermal performance, fast transient response, and integrated power supervision are critical.

FAQ

What is the maximum input voltage for TPS75533KTTRG3?

The absolute maximum input voltage for TPS75533KTTRG3 is 6 V, but the recommended operating range is 2.8 V to 5.5 V. Exceeding 5.5 V risks permanent damage. For reliable 3.3-V output at 5-A load, minimum input must be ≥3.55 V (3.3 V + 250 mV dropout), per datasheet Section 6.5.

Does TPS75533KTTRG3 require an external pull-up resistor on the PG pin?

Yes, TPS75533KTTRG3's PG pin is an open-drain output and requires an external pull-up resistor (typically 10 kΩ to 3.3 V or 5 V) to generate a valid logic-high signal when the output is in regulation. Without it, PG remains floating and cannot drive downstream reset logic reliably.

Can TPS75533KTTRG3 be used in parallel for higher current?

No - TPS75533KTTRG3 is not designed for parallel operation. Its output voltage tolerance (±3%) and lack of current-sharing circuitry make unbalanced current distribution likely, risking thermal runaway. For >5 A, use a single higher-current regulator or a dedicated multiphase controller.

What is the thermal resistance (RθJA) of TPS75533KTTRG3 in standard layout?

In a JEDEC High-K board (2S2P) with 1 oz. copper planes and no heatsink, TPS75533KTTRG3 (TO-263 package) has RθJA = 38.7°C/W. With a 2 cm² copper pad tied to ground plane via thermal vias and 150 LFM airflow, RθJA improves to ~29°C/W - enabling 2.4 W dissipation at 55°C ambient.

Is TPS75533KTTRG3 pin-compatible with other TPS755xx variants?

Yes - all TPS755xx devices (e.g., TPS75515, TPS75525, TPS75533, TPS75501) share identical TO-220 (KC) and TO-263 (KTT) pinouts and terminal functions. This allows drop-in replacement across output voltages in the same package, simplifying design reuse and BOM consolidation.