Texas Instruments TPS75918KTTT

Overview

TPS75918KTTT from Texas Instruments is a 7.5-A, 1.8-V fixed-output low-dropout (LDO) voltage regulator in TO-263 (KTT) package, featuring PMOS pass element, open-drain power-good (PG) output, and thermal shutdown protection. It delivers 1.8 V ±3% over line, load, and temperature (–40°C to 125°C), with typical dropout of 400 mV at 7.5 A and quiescent current of 125 µA - optimized for high-current FPGA core supply and DSP power rails.

For engineers reviewing the TPS75918KTTT datasheet, TPS75918KTTT pinout, TPS75918KTTT application, or TPS75918KTTT equivalent, key selection criteria include verified 7.5-A continuous output capability, PG threshold at 91% VO with hysteresis, fast transient response under ±1 A/µs load steps, and compatibility with ≥47 µF output capacitors having ≥200 mΩ ESR.

Technical Context

The TPS75918KTTT uses a PMOS pass transistor enabling low dropout (400 mV @ 7.5 A) and load-independent quiescent current (125 µA). Its internal bandgap reference is 1.22 V, and the feedback node (FB/PG) serves dual roles: PG status for fixed-output variants and voltage-setting input for adjustable versions - though TPS75918KTTT implements the former only.

Power-good logic monitors output voltage continuously; PG asserts low when VO reaches ≥91% of nominal (1.638 V), with 0.5% hysteresis, requiring an external pull-up. Enable (EN) is active-low: logic low enables regulation; logic high disables, reducing standby current to <1 µA.

Key Specifications

Pinout & Package

TPS75918KTTT is housed in a 5-pin TO-263 (KTT) surface-mount package with exposed thermal pad (PowerPAD™). The package supports high-power dissipation via PCB copper plane conduction (R_θJA = 38.7°C/W on JEDEC High-K board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS75918KTTT, TPS75918KC offers identical regulation performance but demands greater PCB real estate and thermal management due to TO-220 packaging, while TPS7H3301-SP trades 7.5-A capability for radiation hardness - making TPS75918KTTT optimal for high-current, surface-mount industrial and automotive applications where thermal efficiency and density are prioritized.

Availability

TPS75918KTTT is available at Aetrix Electronics and suitable for FPGA power delivery, DSP processor rails, industrial PLC modules, and automotive ADAS camera systems requiring stable component supply across extended temperature ranges and high-reliability production cycles.

Supply support for TPS75918KTTT 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-performance linear regulators and power solutions.

The TPS759xx family was designed specifically for high-current, low-dropout point-of-load regulation in FPGA, DSP, and ASIC applications - emphasizing thermal robustness, fast transient response, and integrated power-good monitoring.

FAQ

What is the maximum continuous output current of the TPS75918KTTT?

The TPS75918KTTT delivers 7.5 A of continuous output current under specified thermal conditions (TJ ≤ 125°C, adequate PCB copper area). This rating is validated per TI SLVS318E datasheet Figure 10–12 load transient and dropout curves, and assumes proper heatsinking using the TO-263 PowerPAD™ layout per JEDEC High-K board guidelines. Exceeding this current risks thermal shutdown activation.

Does the TPS75918KTTT require an external feedback resistor network?

No, the TPS75918KTTT is a fixed-output 1.8-V regulator and does not require external feedback resistors. Its FB/PG pin functions solely as an open-drain power-good indicator - not a feedback input. External resistors are only needed for the adjustable variant TPS75901. For TPS75918KTTT, connect FB/PG to a pull-up resistor (e.g., 10 kΩ to 3.3 V) to monitor regulation status.

What is the recommended output capacitor for stable operation of the TPS75918KTTT?

The TPS75918KTTT requires a minimum 47 µF output capacitor with an equivalent series resistance (ESR) of at least 200 mΩ. Solid tantalum, aluminum electrolytic, or polymer capacitors meeting these values ensure loop stability across the full 0–7.5 A load range. Ceramic capacitors alone are insufficient due to near-zero ESR; a hybrid approach (e.g., 47 µF tantalum + 10 µF ceramic) is acceptable if total ESR ≥200 mΩ.

How does the power-good (PG) function operate on the TPS75918KTTT?

The PG output on the TPS75918KTTT is an open-drain, active-low signal that transitions low when the output voltage reaches ≥91% of nominal (≥1.638 V), with 0.5% hysteresis. It remains low until VO drops below 90.5% (1.629 V). An external pull-up resistor is mandatory - typically 10 kΩ to the system's 3.3-V or 5-V rail. This signal is used for power-on reset sequencing and fault detection in host controllers.

Can the TPS75918KTTT be used in automotive under-hood applications?

Yes, the TPS75918KTTT is rated for operation from –40°C to +125°C junction temperature and features thermal shutdown (150°C trip), UVLO (2.2 V), and robust transient response - making it suitable for automotive ADAS camera modules and infotainment power supplies. While not AEC-Q200 qualified out-of-box, its electrical and thermal specifications align with under-hood requirements when implemented per TI's layout and thermal guidelines in SLVS318E.