Texas Instruments TPS73201DCQG4

Overview

TPS73201DCQG4 from Texas Instruments is a capacitor-free, NMOS-based low-dropout (LDO) voltage regulator delivering up to 250mA output current with 40mV typical dropout at full load, 0.5% initial accuracy, and 30μVRMS output noise (10kHz–100kHz). It operates from 1.7V to 5.5V input and supports adjustable output from 1.2V to 5.5V - ideal for powering noise-sensitive VCOs in portable RF modules.

For engineers reviewing the TPS73201DCQG4 datasheet, TPS73201DCQG4 pinout, TPS73201DCQG4 application, or TPS73201DCQG4 equivalent, key selection criteria include ultra-low-noise operation without mandatory output capacitance, reverse current protection, thermal shutdown, and SOT-223-6 package compatibility with high-power-density PCB layouts.

Technical Context

The TPS73201DCQG4 uses an NMOS pass transistor with integrated 4MHz charge pump to drive the gate above VOUT, enabling stable regulation down to 1.2V output while maintaining <150mV dropout at 250mA. Its voltage-follower topology eliminates ESR dependency and permits zero-output-capacitor operation.

It features active reverse current protection (≤10µA reverse leakage), a dedicated feedback (FB) pin for adjustable output configuration, and internal foldback current limiting with thermal shutdown - all implemented in an advanced BiCMOS process for precision and low ground current across temperature.

Key Specifications

Pinout & Package

SOT-223-6 package (DCQ): 6.5mm × 7.06mm body with exposed thermal pad (TAB = GND); optimized for >1W power dissipation in compact industrial and portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS73201DBVR and MCP1826T-2502E/DB, the TPS73201DCQG4 uniquely combines capacitor-free stability, 40mV dropout, 30μVRMS noise, and reverse current blocking in a thermally robust SOT-223 package - making it the only option qualified for high-reliability RF and precision analog point-of-load regulation.

Availability

TPS73201DCQG4 is available at Aetrix Electronics and suitable for portable RF transceivers, FPGA I/O bank regulation, and industrial sensor signal chains requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for TPS73201DCQG4 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 design expertise and broad automotive/industrial qualification.

The TPS732 product line delivers capacitor-free, low-noise, NMOS-based LDOs for noise-sensitive and space-constrained applications - engineered specifically for VCOs, RF ICs, and precision analog systems where traditional LDO limitations impede performance.

FAQ

Does TPS73201DCQG4 require an output capacitor for stability?

No, the TPS73201DCQG4 is explicitly designed for capacitor-free operation due to its NMOS voltage-follower topology and internal compensation. Stability is maintained across all output capacitance values - including zero - eliminating BOM cost and layout constraints. However, adding a 1µF–10µF ceramic capacitor improves load transient response and further reduces output impedance at high frequencies.

What is the function of the NR/FB pin on TPS73201DCQG4?

On the TPS73201DCQG4 - an adjustable-output variant - the NR/FB pin serves solely as the feedback (FB) input for configuring output voltage via an external resistor divider (R1 + R2 = 80kΩ). Unlike fixed-output versions, it does not support noise reduction (NR) capacitor connection; instead, output noise is reduced by placing a feedback capacitor (CFB) from OUT to FB.

How does reverse current protection work in TPS73201DCQG4?

The TPS73201DCQG4 implements NMOS-based reverse current blocking: when the IN pin voltage falls below the regulated OUT voltage (e.g., during input brownout or hot-swap), the pass transistor remains off, limiting reverse leakage to ≤10µA. This prevents backfeeding into upstream supplies - critical in multi-rail systems and battery-backed circuits where uncontrolled current flow could damage sources or drain batteries.

Can TPS73201DCQG4 be used with a 1.2V input supply?

No - the absolute minimum input voltage for TPS73201DCQG4 is 1.7V, as specified in the Recommended Operating Conditions. At 1.2V input, the device cannot achieve regulation even at its lowest supported output (1.2V), since dropout voltage plus internal headroom requirements exceed the available VIN–VOUT margin. For sub-1.7V inputs, consider TI's TPS7A05 or similar ultra-low-input LDOs.

What thermal considerations apply to TPS73201DCQG4 in SOT-223 package?

The TPS73201DCQG4 in DCQ (SOT-223-6) package has RθJA = 76°C/W (new silicon) - meaning junction temperature rise is ~19°C at 250mA with 1W dissipation (e.g., VIN=3.3V, VOUT=2.5V). To maintain TJ ≤125°C in 85°C ambient, ensure ≥4 thermal vias under the exposed pad connected to a solid ground plane, and avoid enclosing the device in tight enclosures without airflow.