Texas Instruments TPS79133DBVRG4

Overview

TPS79133DBVRG4 from Texas Instruments is a fixed-output 3.3-V, 100-mA ultralow-noise low-dropout linear regulator (LDO) in a 5-pin SOT23 package. It delivers 15 µV_RMS output noise with 0.1-µF bypass capacitor, 73 dB PSRR at 10 kHz, and 50 mV dropout at 100 mA - optimized for powering RF-sensitive circuits such as VCOs and PLLs in portable wireless systems.

For engineers reviewing the TPS79133DBVRG4 datasheet, TPS79133DBVRG4 pinout, TPS79133DBVRG4 application, or TPS79133DBVRG4 equivalent, key selection criteria include its fast 53–98 µs start-up time (dependent on bypass capacitance), stability with ≥1-µF ceramic output capacitors, and active-low enable with <0.7 V logic-low threshold for precise power sequencing control.

Technical Context

The TPS79133DBVRG4 employs a PMOS pass transistor architecture enabling ultra-low dropout and reverse-current protection via an integrated back diode. Its proprietary BiCMOS process ensures stable regulation across –40°C to 125°C junction temperature while maintaining 170 µA typical quiescent current and sub-1 µA shutdown current.

It integrates a precision 1.2246-V bandgap reference, UVLO (2.25–2.65 V), and internal current limiting (~400 mA). The BYPASS pin forms a low-pass filter with an external capacitor to suppress high-frequency noise - critical for spectral purity in RF signal chains.

Key Specifications

Pinout & Package

TPS79133DBVRG4 uses the 5-pin SOT23 (DBV) package, measuring 2.90 mm × 1.60 mm, with exposed pad not electrically connected. Pin 1 is IN; Pin 2 is GND; Pin 3 is EN (active-low); Pin 4 is BYPASS; Pin 5 is OUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL720F33DBVR and TPS7A2033PDBVR, the TPS79133DBVRG4 uniquely balances ultralow noise, high PSRR, and user-controllable noise filtering via the BYPASS pin - making it the preferred choice for RF timing-critical applications where spectral purity and design flexibility are jointly prioritized.

Availability

TPS79133DBVRG4 is available at Aetrix Electronics and suitable for RF power management, portable wireless systems, and battery-powered instrumentation requiring stable component supply and long-term manufacturability.

Supply support for TPS79133DBVRG4 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 ICs and precision analog signal chains.

The TPS791 family was designed specifically for noise-sensitive RF and signal-chain applications - delivering ultralow noise, high PSRR, and fast transient response in space-constrained SOT23 packages.

FAQ

What is the minimum input voltage required for stable operation of the TPS79133DBVRG4?

The minimum input voltage for TPS79133DBVRG4 is 3.35 V under full 100-mA load (3.3 V + 50 mV dropout), and 2.7 V at light loads. Per datasheet Section 6.3, VIN must be ≥ VOUT(typ) + 1 V for guaranteed specifications - so 4.3 V is recommended for robust margin across temperature and process variation. Always verify against actual load and thermal conditions using the formula VIN(min) = VOUT + VDO(IOUT,TJ).

Does the TPS79133DBVRG4 require an external feedback resistor network?

No, the TPS79133DBVRG4 is a fixed-output 3.3-V regulator and does not require external feedback resistors. It uses an internal resistor divider tied to a precision 1.2246-V reference. External resistors are only needed for the adjustable TPS79101 variant. The TPS79133DBVRG4 simplifies layout and reduces component count by eliminating FB pin and associated R1/R2 network.

Can the TPS79133DBVRG4 be used with a 0.47-µF output capacitor?

No - the TPS79133DBVRG4 is specified and tested for stability with ≥1-µF ceramic output capacitors (X5R/X7R). Using 0.47 µF violates the minimum capacitance requirement and risks oscillation or poor transient response. Figure 29–31 in the datasheet confirm instability regions for COUT < 1 µF. Always use ≥1 µF with ESR < 100 mΩ for reliable operation.

What is the purpose of the BYPASS pin on the TPS79133DBVRG4?

The BYPASS pin on the TPS79133DBVRG4 connects to an external capacitor (0.001–0.1 µF) to form a low-pass filter with an internal 250-kΩ resistor, reducing high-frequency output noise - especially critical for VCO/PLL phase noise. Unlike standard LDOs, this pin provides user-tunable noise suppression without adding series resistance or degrading PSRR at lower frequencies.

Is the TPS79133DBVRG4 RoHS-compliant and lead-free?

Yes, the TPS79133DBVRG4 is RoHS-compliant and lead-free. Per Texas Instruments' official packaging information, the DBVRG4 suffix denotes Green (RoHS-compliant) packaging with matte tin lead finish. It meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is rated for reflow up to 260°C peak. Full compliance documentation is available in TI's Quality & Environmental section.