Texas Instruments TPS79133MDBVTEP

Overview

TPS79133MDBVTEP from Texas Instruments is a 3.3-V, 100-mA ultra-low-noise, high-PSRR, fast-startup low-dropout linear regulator in an enhanced plastic SOT-23-5 package rated for –55°C to 125°C operation. It delivers 3.234–3.366 V output with 38 mV dropout at full load, 15 µVRMS output noise (with 0.1-µF bypass), and 73 dB PSRR at 10 kHz - optimized for RF power supply filtering in defense-grade transceivers.

For engineers reviewing the TPS79133MDBVTEP datasheet, TPS79133MDBVTEP pinout, TPS79133MDBVTEP application, or TPS79133MDBVTEP equivalent, key selection criteria include military-temperature stability, sub-1-µA shutdown current, compatibility with 1-µF ceramic output capacitors, and BYPASS-pin noise-filtering architecture for VCO/PLL supply rails.

Technical Context

The TPS79133MDBVTEP uses a PMOS pass transistor with integrated UVLO (2.25–2.65 V threshold) and thermal shutdown (~165°C trip). Its internal 250-kΩ resistor on the BYPASS pin forms an RC filter with external capacitance to suppress reference noise before it modulates the output.

It operates with input voltages from 4.3 V to 5.5 V (per recommended conditions), achieves 63 µs start-up time with 0.001-µF bypass capacitor, and maintains regulation under ±5% line/load transient events typical of RF power amplifier bias sequencing.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.15 mm body, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79133DBVREP, the TPS79133MDBVTEP adds guaranteed –55°C functionality and small-tape-and-reel packaging for prototyping; compared with LM3940IT-3.3/NOPB, it delivers 33× lower noise and 13× lower dropout - making it the sole option for mil-aero RF biasing where both thermal robustness and spectral cleanliness are mandatory.

Availability

TPS79133MDBVTEP is available at Aetrix Electronics and suitable for defense electronics, aerospace avionics, and medical imaging equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS79133MDBVTEP 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 connectivity technologies with over 50 years of innovation in power management ICs.

The TPS791xx family was designed specifically for noise-sensitive RF and precision analog applications in defense, aerospace, and medical systems - emphasizing ultralow noise, high PSRR, and extended temperature reliability.

FAQ

What is the minimum input voltage required for stable operation of the TPS79133MDBVTEP?

The TPS79133MDBVTEP requires a minimum input voltage of 4.3 V under recommended operating conditions. This is derived from VO(typ) + 1 V = 3.3 V + 1 V. At 100 mA load, the 38-mV dropout means the absolute minimum is 3.338 V, but TI specifies 4.3 V as the practical lower limit to ensure PSRR and transient performance across temperature. The TPS79133MDBVTEP will not regulate correctly below 4.3 V in production use.

Does the TPS79133MDBVTEP require an external feedback resistor network?

No, the TPS79133MDBVTEP is a fixed-output 3.3-V regulator and does not require external feedback resistors. It belongs to the fixed-voltage variant of the TPS791xx family (as opposed to the adjustable TPS79101). The FB pin is absent - the TPS79133MDBVTEP uses an internal trimmed reference and has only five terminals: IN, GND, EN, OUT, and BYPASS.

How does the BYPASS pin on the TPS79133MDBVTEP reduce output noise?

The BYPASS pin on the TPS79133MDBVTEP connects internally to the voltage reference through a precise 250-kΩ resistor. When a 0.1-µF ceramic capacitor is placed from BYPASS to GND, it forms a low-pass RC filter (fc ≈ 6.4 kHz) that attenuates reference noise before it modulates the error amplifier. This architecture reduces integrated output noise from ~100 µVRMS to 15 µVRMS - a 85% reduction confirmed in TI's SGLS161A characterization data.

Is the TPS79133MDBVTEP pin-compatible with standard SOT-23-5 footprints?

Yes, the TPS79133MDBVTEP uses the industry-standard SOT-23-5 (DBV) package with 0.95-mm lead pitch and JEDEC MO-178AC outline. Its pinout (IN-GND-EN-OUT-BYPASS) matches TI's documented DBV top view and is mechanically compatible with automated placement equipment calibrated for SOT-23-5 components. No footprint modification is needed when replacing other DBV-packaged LDOs with identical pin function mapping.

What protection features are integrated into the TPS79133MDBVTEP?

The TPS79133MDBVTEP integrates overcurrent limiting (trip at ~400 mA), thermal shutdown (~165°C junction), UVLO (2.25–2.65 V hysteresis), and reverse-current protection via its PMOS pass transistor's intrinsic body diode. These functions operate without external components and are fully characterized across –55°C to 125°C. The TPS79133MDBVTEP does not include reverse-voltage blocking or external fault reporting pins.