Texas Instruments TPS73233DBVRG4

Overview

TPS73233DBVRG4 from Texas Instruments is a capacitor-free, NMOS-based low-dropout (LDO) voltage regulator delivering 3.3V at up to 250mA with 40mV typical dropout at full load, reverse current protection, and 30μVRMS output noise (10kHz–100kHz). It operates from 1.7V to 5.5V input and targets noise-sensitive analog power rails in portable and battery-powered systems.

For engineers reviewing the TPS73233DBVRG4 datasheet, TPS73233DBVRG4 pinout, TPS73233DBVRG4 application, or TPS73233DBVRG4 equivalent, key selection criteria include ultra-low-noise regulation without output capacitance, thermal shutdown/foldback current limiting, EN-controlled shutdown (<1μA IQ), and SOT-23-5 package compatibility for space-constrained PCB layouts.

Technical Context

The TPS73233DBVRG4 uses an NMOS pass transistor with integrated 4MHz charge pump to drive the gate above VOUT, enabling stable regulation down to 1.7V input and supporting fixed 3.3V output without external compensation. Its voltage-follower topology eliminates ESR dependency and permits zero-output-capacitor operation.

It features dedicated NR (noise-reduction) pin functionality-connecting 0.01μF from NR to GND reduces output noise to ~12.75μVRMS-and integrates foldback current limiting, thermal shutdown (160°C trip), and <0.5% initial output accuracy over temperature and load.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9mm × 2.8mm footprint with exposed pad not present; suitable for compact, thermally constrained layouts where board area is critical.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS73233DBVRG4, TPS73233DBVT offers identical performance in tape-and-reel format for volume manufacturing, while MCP1700T-3302E/TT trades off noise performance, reverse leakage, and dropout for lower unit cost - making it suitable only where those parameters are non-critical.

Availability

TPS73233DBVRG4 is available at Aetrix Electronics and suitable for portable electronics, post-regulation of DC/DC converters, and noise-sensitive analog power supplies requiring stable component supply with full traceability and lifecycle support.

Supply support for TPS73233DBVRG4 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 ICs, with decades of LDO design expertise and broad automotive/industrial qualification.

The TPS732 family was engineered for ultra-low-noise, capacitor-free operation in battery-powered and signal-integrity-critical applications - emphasizing stability without external compensation, reverse current blocking, and thermal robustness in miniature packages.

FAQ

Does the TPS73233DBVRG4 require an output capacitor for stability?

No, the TPS73233DBVRG4 is explicitly designed to operate stably with zero output capacitance due to its NMOS voltage-follower architecture and internal compensation. This eliminates ESR constraints and allows deployment in systems where output capacitance is undefined or variable - such as modular daughterboards or field-upgradable modules. The TPS73233DBVRG4 maintains regulation and transient response even with COUT = 0.

What is the function of the NR pin on the TPS73233DBVRG4?

The NR (Noise Reduction) pin on the TPS73233DBVRG4 connects to an internal 27kΩ resistor in series with the bandgap reference. Adding a 0.01μF capacitor from NR to GND forms a low-pass filter that reduces output noise from 30μVRMS to ~12.75μVRMS (10kHz–100kHz). This feature is exclusive to fixed-output versions like the TPS73233DBVRG4 and directly improves phase noise in VCO and PLL applications.

Can the TPS73233DBVRG4 be used with input voltages below 2.0V?

Yes - the TPS73233DBVRG4 supports input voltages as low as 1.7V, making it viable for single-cell LiFePO₄ (2.5V–3.6V) and deeply discharged Li-ion (down to ~3.0V) systems. At VIN = 1.7V, it delivers 3.3V output only if VOUT ≤ VIN + VDO; however, since VDO is 40mV typical, the device cannot regulate 3.3V from 1.7V. It *can* regulate lower outputs (e.g., 1.2V–2.8V variants) from 1.7V - but the TPS73233DBVRG4's fixed 3.3V output requires VIN ≥ 3.34V for regulation.

How does reverse current protection work in the TPS73233DBVRG4?

The TPS73233DBVRG4 uses an NMOS pass transistor topology that inherently blocks reverse current flow when the output voltage exceeds the input (e.g., during hot-swap or backup-battery scenarios). With EN disabled, reverse leakage (IREV) is limited to ≤10μA - preventing backfeed into the input rail and protecting upstream sources. This behavior is confirmed in the Electrical Characteristics table under "Reverse leakage current" test conditions.

Is the TPS73233DBVRG4 pin-compatible with other TPS732 variants?

Yes - all TPS732 fixed-output versions in the DBV (SOT-23-5) package share identical pinout: IN, GND, EN, NR, OUT. The TPS73233DBVRG4 is mechanically and electrically pin-compatible with TPS73212DBVRG4, TPS73215DBVRG4, etc., enabling voltage-scaling flexibility on the same PCB layout. No redesign or footprint change is needed when swapping fixed-output variants within the same package.