Texas Instruments TPS73233DCQG4

Overview

TPS73233DCQG4 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 circuitry in portable and battery-powered systems.

For engineers reviewing the TPS73233DCQG4 datasheet, TPS73233DCQG4 pinout, TPS73233DCQG4 application, or TPS73233DCQG4 equivalent, key selection criteria include ultra-low-noise regulation without output capacitance, thermal shutdown/foldback current limiting, fixed 3.3V output, and SOT-223-6 package compatibility with high-power-density PCB layouts.

Technical Context

The TPS73233DCQG4 uses an NMOS pass transistor with integrated 4MHz charge pump to maintain regulation down to 1.7V input while enabling stable operation with zero, low-ESR, or high-value output capacitors. Its voltage-follower topology ensures near-constant ground pin current across load range and provides high reverse blockage (≤10µA reverse leakage).

It features a dedicated NR (noise-reduction) pin-tied internally for fixed-output versions-that enables external 0.01µF bypassing to reduce output noise to ~12.75µVRMS. Thermal shutdown triggers at 160°C with 20°C hysteresis, and foldback current limiting activates below 0.9×VOUT to protect during short-circuit events.

Key Specifications

Pinout & Package

TPS73233DCQG4 is housed in a thermally enhanced 6-pin SOT-223 (DCQ) package measuring 6.5mm × 7.06mm, with exposed thermal pad connected to GND for improved power dissipation (R_θJA = 76°C/W, R_θJB = 18.1°C/W).

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 TPS73233DCQG4 uniquely combines capacitor-free stability, 40mV dropout, 30μVRMS noise, and reverse current blocking in a thermally robust SOT-223 package-making it optimal for high-reliability, noise-critical, battery-sensitive designs.

Availability

TPS73233DCQG4 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, post-regulation for switching supplies, and noise-sensitive RF power amplifiers requiring stable component supply across production lifecycles.

Supply support for TPS73233DCQG4 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 decades of LDO design expertise and broad automotive/industrial qualification.

The TPS732 product line delivers capacitor-free, low-noise, NMOS-based LDOs optimized for portable, battery-constrained, and RF-sensitive applications-emphasizing ultra-low dropout, reverse current blocking, and thermal resilience.

FAQ

Does TPS73233DCQG4 require an output capacitor for stability?

No, the TPS73233DCQG4 is explicitly designed for capacitor-free operation and remains stable with 0 µF, 1 µF, or 10 µF output capacitance. This eliminates BOM cost and board area for bulk capacitors-ideal for space-constrained wearables and modules. The NMOS topology with internal charge pump ensures unconditional stability across capacitor types and values, as verified in TI's SBVS037S datasheet Section 6.1 and Figure 5-31–5-32.

What is the maximum continuous output current for TPS73233DCQG4?

The TPS73233DCQG4 delivers up to 250mA continuous output current under recommended operating conditions (T_J ≤ 125°C, V_IN ≥ V_OUT + V_DO). At 250mA, typical dropout is 40mV, and thermal performance depends on PCB layout-TI specifies R_θJB = 18.1°C/W for the DCQ package with proper thermal vias. Exceeding 250mA triggers foldback current limiting, as shown in Figure 5-17 of the datasheet.

How does the NR pin function on TPS73233DCQG4?

The NR (Noise Reduction) pin on TPS73233DCQG4 is internally connected to the bandgap reference and allows external 0.01µF capacitor-to-GND placement to reduce output noise from 30μVRMS to ~12.75μVRMS (10kHz–100kHz). This feature is enabled by an internal 27kΩ resistor forming a low-pass filter-detailed in Section 6.3.1 and Figure 5-33 of the SBVS037S datasheet. Fixed-output versions like TPS73233DCQG4 have NR tied internally but expose the pin for optional bypassing.

What protection features does TPS73233DCQG4 include?

The TPS73233DCQG4 integrates thermal shutdown (trip at 160°C, reset at 140°C), foldback current limiting (activates below 0.9×V_OUT), and reverse current protection (≤10µA I_REV). These functions are implemented in silicon and require no external components. Absolute maximum ratings also specify –0.3V to 6V on all pins and indefinite short-circuit tolerance-per Section 5.1 and 5.6 of the official TI datasheet.

Is TPS73233DCQG4 pin-compatible with other TPS732 variants?

Yes, the TPS73233DCQG4 shares identical pinout (IN, GND, EN, NR, OUT, N/C) and package (SOT-223-6 DCQ) with all other TPS732 DCQ variants-including TPS73218DCQG4, TPS73225DCQG4, and TPS73250DCQG4. Electrical differences are limited to output voltage and associated accuracy specs; no layout changes are needed when swapping within the DCQ family for voltage scaling.