Texas Instruments TPS79133DBVRQ1

Overview

TPS79133DBVRQ1 from Texas Instruments is an automotive-grade 3.3-V, 100-mA low-dropout (LDO) linear regulator in a 5-pin SOT-23 package. It delivers ultralow noise (15 µVRMS), high PSRR (73 dB at 10 kHz), fast start-up (63 µs), and stable operation with any 1-µF ceramic output capacitor - designed for powering noise-sensitive RF analog circuits in automotive infotainment and telematics systems.

For engineers reviewing the TPS79133DBVRQ1 datasheet, TPS79133DBVRQ1 pinout, TPS79133DBVRQ1 application, or TPS79133DBVRQ1 equivalent, key selection criteria include dropout voltage under full load (90 mV), standby current (<1 µA), EN logic polarity (active-low), thermal shutdown behavior, and compatibility with 0.1–0.1 µF bypass capacitors for spectral noise reduction.

Technical Context

The TPS79133DBVRQ1 uses a PMOS pass transistor architecture with internal bandgap reference and UVLO circuitry, enabling stable regulation across −40°C to 125°C ambient temperature. Its proprietary BiCMOS process achieves low quiescent current (170 µA typical) and sub-100-mV dropout at 100 mA while maintaining fast transient response and low output impedance below 100 kHz.

It integrates a dedicated BYPASS pin connected via a 250-kΩ internal resistor to the voltage reference, allowing external RC filtering to suppress reference noise. The EN pin controls device enable/disable with logic-level thresholds (VIH = 2 V, VIL = 0.7 V), and thermal shutdown activates at ~165°C with automatic recovery at ~140°C.

Key Specifications

Pinout & Package

TPS79133DBVRQ1 is housed in a RoHS-compliant, lead-free 5-pin SOT-23 (DBV) package with 1.45 mm max height, JEDEC MO-178 compliant footprint, and moisture sensitivity level (MSL) 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79133DBVRQ1, TPS79133DBVRG4Q1 offers identical regulation performance with updated surface finish, while TPS7A2033PDQNR trades noise performance and BYPASS functionality for lower quiescent current and smaller footprint - making it suitable only for digital logic rails, not RF/analog signal chains.

Availability

TPS79133DBVRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, telematics, V2X communication, and ADAS camera sensor interface applications requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for TPS79133DBVRQ1 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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and automotive electronics.

The TPS791-Q1 product line delivers automotive-qualified LDO regulators optimized for noise-sensitive RF and analog subsystems, emphasizing ultralow noise, fast transient response, and robust thermal protection in compact packages.

FAQ

What is the minimum input voltage required for TPS79133DBVRQ1 to maintain regulation at full 100 mA load?

The minimum input voltage for TPS79133DBVRQ1 is calculated as VO + VDO = 3.3 V + 90 mV = 3.39 V at TJ = 25°C. Per datasheet Section 4, the absolute minimum VI is 2.7 V, but for guaranteed 100 mA operation, VI must be ≥3.39 V. At higher junction temperatures, dropout increases - e.g., up to 80 mV at 125°C - so design margin should include worst-case thermal conditions. TPS79133DBVRQ1 remains functional down to 2.7 V input but cannot sustain full load below VO + VDO.

Does TPS79133DBVRQ1 require an external feedback resistor network?

No, TPS79133DBVRQ1 is a fixed-output 3.3 V LDO and does not use an external feedback divider. It belongs to the fixed-voltage variant of the TPS791xx family (as confirmed by pin count: 5-pin DBV package, with no FB pin). Only the adjustable TPS79101 (6-pin DBV) requires R1/R2 resistors. TPS79133DBVRQ1 integrates internal feedback and requires only IN, GND, EN, OUT, and BYPASS connections. Using TPS79133DBVRQ1 eliminates resistor placement, trimming, and associated layout complexity.

How does the BYPASS pin on TPS79133DBVRQ1 reduce output noise, and what capacitor value is recommended?

The BYPASS pin connects internally to the bandgap reference through a 250-kΩ resistor; adding an external capacitor forms an RC low-pass filter that attenuates reference noise before it modulates the output. A 0.1 µF ceramic capacitor yields 15 µVRMS output noise (100 Hz–100 kHz), while 0.01 µF gives 16 µVRMS and 0.001 µF gives 32 µVRMS. Larger values slow start-up due to RC time constant (τ = 250 kΩ × C), so 0.1 µF is optimal for noise-sensitive RF applications. TPS79133DBVRQ1 performance degrades if leakage current exceeds 10 nA.

Is TPS79133DBVRQ1 compatible with 1-µF ceramic output capacitors, and why is this significant?

Yes, TPS79133DBVRQ1 is explicitly characterized and guaranteed stable with any 1-µF ceramic output capacitor - including X5R/X7R types with ESR <10 mΩ. This eliminates reliance on higher-ESR tantalum or aluminum electrolytic capacitors traditionally needed for LDO stability. The benefit is reduced board area, improved reliability (no electrolyte drying), lower cost, and better high-frequency decoupling. Stability is maintained even with 0.47 µF ceramics if ESR ≥75 mΩ, per Figure 29–31 in the datasheet.

What protection features are integrated into TPS79133DBVRQ1, and how do they behave under fault conditions?

TPS79133DBVRQ1 integrates overcurrent limiting (trip point ~285–600 mA), thermal shutdown (~165°C activation, ~140°C recovery), and UVLO (2.25–2.65 V rising threshold with 100 mV hysteresis). During overcurrent, output voltage folds back linearly rather than shutting down abruptly - preserving downstream logic states. Thermal shutdown is fully autonomous and self-recovering. The PMOS pass device includes a body diode that conducts reverse current if VI < VO; external reverse-current blocking is advised in systems with multiple power domains.