Texas Instruments TPS73133DBVTG4

Overview

TPS73133DBVTG4 from Texas Instruments is a capacitor-free, NMOS-based 150mA low-dropout linear regulator with reverse current protection and fixed 3.3V output. It operates from 1.7V to 5.5V input, delivers ultra-low 30mV typical dropout at full load, and achieves 0.5% initial accuracy and 30μVRMS output noise (10kHz–100kHz) - enabling clean power for VCOs in wireless infrastructure and medical equipment.

For engineers reviewing the TPS73133DBVTG4 datasheet, TPS73133DBVTG4 pinout, TPS73133DBVTG4 application, or TPS73133DBVTG4 equivalent, this page provides verified specifications, SOT-23-5 pin mapping, real-world use cases in smart grid and test equipment, and two validated alternative LDOs with documented functional and parametric differences.

Technical Context

The TPS73133DBVTG4 uses an NMOS pass transistor driven by a 4MHz internal charge pump to maintain gate voltage above VOUT, enabling stable regulation without output capacitance. Its voltage-follower topology ensures stability across capacitor types and values - including zero-output-capacitor operation - while delivering near-constant ground pin current over load.

Reverse current blocking is achieved by actively discharging the NMOS gate via the EN pin; shutdown current is <1μA, and thermal shutdown activates at 160°C with hysteresis. The NR pin supports external 0.01μF bypassing to reduce output noise to ~12.75μVRMS for ultra-sensitive analog loads.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9mm × 2.8mm footprint, surface-mount, thermally enhanced with exposed pad (not electrically connected). Compatible with standard reflow profiles and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS73233DBVT and MCP1703T-3302E/MB, the TPS73133DBVTG4 uniquely combines capacitor-free operation, 30mV dropout, and active reverse current blocking - making it irreplaceable in space-constrained, battery-fed, or multi-rail systems demanding highest efficiency and fault resilience.

Availability

TPS73133DBVTG4 is available at Aetrix Electronics and suitable for smart grid sensors, medical patient monitors, and test & measurement equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS73133DBVTG4 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 LDO innovation and automotive-grade reliability validation.

The TPS731 product line was designed specifically for portable and noise-sensitive applications requiring capacitor-free stability, ultra-low dropout, and robust reverse-current protection - targeting medical, test equipment, and wireless infrastructure markets.

FAQ

What is the minimum input voltage required for TPS73133DBVTG4 to regulate at 3.3V?

The TPS73133DBVTG4 requires a minimum input voltage of 3.33V under full 150mA load due to its 30mV typical dropout voltage. At lighter loads, VIN can be as low as 1.7V - but regulation is only guaranteed when VIN ≥ VOUT + VDO. For reliable 3.3V output across all conditions, maintain VIN ≥ 3.33V.

Does TPS73133DBVTG4 require an output capacitor for stability?

No - the TPS73133DBVTG4 is explicitly designed for capacitor-free operation. Its NMOS voltage-follower topology with integrated charge pump ensures stability with zero, ceramic, tantalum, or electrolytic output capacitors. An optional COUT improves transient response and PSRR but is never mandatory.

How does the NR pin on TPS73133DBVTG4 reduce output noise?

The NR pin on TPS73133DBVTG4 connects to the internal bandgap reference node. Adding a 0.01μF capacitor from NR to GND forms a low-pass filter with the internal 27kΩ resistor, reducing broadband noise by ~3.2× - lowering RMS noise from 30μVRMS to approximately 12.75μVRMS (10Hz–100kHz) for VCO and PLL applications.

What happens to reverse current protection when the EN pin is left unconnected?

If EN is left floating or tied to IN, the TPS73133DBVTG4 cannot fully discharge the NMOS gate, compromising reverse current blocking. To ensure <10μA reverse leakage, EN must be actively driven LOW before VIN is removed. Leaving EN uncontrolled may allow backfeed from OUT to IN during power-down sequences.

Is TPS73133DBVTG4 compatible with lead-free reflow soldering processes?

Yes - the TPS73133DBVTG4 in DBV (SOT-23-5) package is rated for standard lead-free reflow profiles per JEDEC J-STD-020. Peak temperature tolerance is 260°C, and the package meets IPC/JEDEC moisture sensitivity level 1 (MSL-1), requiring no dry-pack handling prior to assembly.