Texas Instruments TPS73118MDBVREP

Overview

TPS73118MDBVREP from Texas Instruments is a radiation-hardened, extended-temperature (-55°C to +125°C) 150 mA low-dropout linear regulator with fixed 1.8 V output, NMOS pass element, 30 mV typical dropout, 0.5% initial accuracy, and reverse current protection. It powers noise-sensitive analog circuitry in space-grade FPGA core supplies and post-regulation of switching converters.

For engineers reviewing the TPS73118MDBVREP datasheet, TPS73118MDBVREP pinout, TPS73118MDBVREP application, or TPS73118MDBVREP equivalent, key selection criteria include ultra-low-noise operation (30 μVRMS), capacitor-free stability, shutdown current <1 μA, and qualification for high-reliability aerospace systems.

Technical Context

The TPS73118MDBVREP employs an NMOS pass transistor in voltage-follower topology, enabling stable operation without output capacitance and delivering near-constant ground pin current across load. Its internal charge pump drives the NMOS gate above VOUT, supporting ultralow dropout while maintaining reverse leakage <15 μA.

It integrates thermal shutdown (trip at 160°C), foldback current limiting (150–500 mA), and precision bandgap reference (1.2 V nominal) with ±0.5% initial accuracy. The device operates over 1.7 V to 5.5 V input range and is qualified per JEDEC HAST, temperature cycling, and electromigration standards for extended-life reliability.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.15 mm, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS73118MDBVREP, TPS73218MDBV offers higher current but no radiation hardening or extended-temperature pedigree, while LP3878MRX-1.8/NOPB delivers more current at the expense of noise performance, capacitor dependency, and missing reverse-current protection-making TPS73118MDBVREP uniquely suited for high-integrity aerospace loads.

Availability

TPS73118MDBVREP is available at Aetrix Electronics and suitable for spacecraft power management, FPGA core regulation, and radiation-hardened sensor interface applications requiring stable component supply across extended temperature and long lifecycle programs.

Supply support for TPS73118MDBVREP 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 high-reliability components for aerospace, automotive, and industrial markets.

The TPS731xx family was designed specifically for extended-temperature, high-reliability point-of-load regulation in space-constrained, noise-sensitive systems where capacitor-free operation and reverse current blocking are essential design requirements.

FAQ

What is the maximum output current capability of the TPS73118MDBVREP?

The TPS73118MDBVREP provides a continuous output current of 150 mA under all operating conditions. Its internal foldback current limit activates at 150–500 mA depending on output voltage and temperature, protecting the device during overload or short-circuit events without requiring external current-sense circuitry. This rating is validated across the full –55°C to +125°C temperature range.

Does the TPS73118MDBVREP require an output capacitor for stability?

No, the TPS73118MDBVREP is explicitly designed to be stable with zero output capacitance - a key differentiator enabled by its NMOS voltage-follower topology. It remains stable with any value or type of capacitor (ceramic, tantalum, aluminum electrolytic) if added for improved transient response or noise filtering. This eliminates capacitor aging, microphonics, and ESR-related instability concerns in long-life systems.

How does the NR pin on the TPS73118MDBVREP reduce output noise?

The NR pin on the TPS73118MDBVREP connects to an internal 27 kΩ resistor tied to the bandgap reference. Adding an external capacitor (e.g., 0.01 μF) forms a low-pass filter that attenuates reference noise - reducing total output RMS noise from ~30 μVRMS to ~8.5 × VOUT (e.g., ~15 μVRMS at 1.8 V). This feature is critical for powering VCOs, PLLs, and high-resolution ADCs where phase noise directly impacts system performance.

What is the reverse leakage current specification for the TPS73118MDBVREP?

The TPS73118MDBVREP specifies reverse leakage current (IREV) of ≤15 μA maximum when the enable pin is low and VIN ≤ VOUT. This ultra-low reverse conduction is achieved via its NMOS pass element architecture and ensures no significant backfeed occurs in redundant power architectures - a vital requirement for fault-isolated satellite bus designs where multiple regulators feed common downstream rails.

Is the TPS73118MDBVREP pin-compatible with other members of the TPS731xx family?

Yes, all TPS731xx-EP variants in the SOT-23-5 (DBV) package - including TPS731125MDBVREP, TPS73125MDBVREP, and TPS73133MDBVREP - share identical pinout, footprint, and thermal characteristics. This allows direct substitution across output voltages (1.2 V to 5.0 V) without PCB redesign, simplifying inventory management and enabling flexible voltage scaling in multi-rail systems.