Texas Instruments TLV71729PDQNR

Overview

TLV71729PDQNR from Texas Instruments is a 150-mA, low-dropout linear regulator with 2.9-V fixed output, 215-mV dropout at full load, 0.5% typical output accuracy, 35-µA quiescent current, and foldback current limiting. It serves as a power supply rail for RF-sensitive portable electronics requiring stable low-noise voltage under light-to-moderate load.

For engineers reviewing the TLV71729PDQNR datasheet, TLV71729PDQNR pinout, TLV71729PDQNR application, or TLV71729PDQNR equivalent, key selection criteria include dropout performance at 150 mA, active pulldown capability, stability with 0.1-µF ceramic output capacitance, and operation across –40°C to +85°C junction temperature.

Technical Context

The TLV71729PDQNR uses a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse-voltage protection via its body diode. Its foldback current limit initiates near 350 mA and reduces short-circuit current to 40 mA, minimizing thermal stress during faults.

It integrates undervoltage lockout (UVLO = 1.6 V), an active-high enable input (VIH = 0.9 V, VIL = 0.4 V), and an internal 120-Ω pulldown resistor to discharge the output during shutdown - all within a thermally enhanced 1-mm × 1-mm X2SON (DQN) package.

Key Specifications

Pinout & Package

TLV71729PDQNR is housed in a 4-pin, 1.00 mm × 1.00 mm X2SON (DQN) package with an exposed thermal pad connected to GND for enhanced heat dissipation in space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F29TAV50 and MCP1826T-2.9V/DC, TLV71729PDQNR offers superior combination of ultra-low dropout (215 mV), minimal footprint (1 mm²), and lowest quiescent current (35 µA), making it optimal for space- and battery-constrained portable electronics - whereas alternatives prioritize automotive robustness or higher current delivery.

Availability

TLV71729PDQNR is available at Aetrix Electronics and suitable for smartphone RF subsystems, wearable sensor hubs, industrial handheld terminals, medical point-of-care monitors, and portable electronic point-of-sale systems requiring stable component supply with guaranteed long-term sourcing.

Supply support for TLV71729PDQNR 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 designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and consumer markets.

The TLV717P series was developed specifically for power-sensitive portable electronics, emphasizing ultra-low IQ, small footprint, and robust transient performance in RF-critical applications.

FAQ

What is the maximum input voltage rating for TLV71729PDQNR?

The absolute maximum input voltage for TLV71729PDQNR is 6 V, but the recommended operating range is 1.7 V to 5.5 V. Exceeding 5.5 V may trigger internal protection or degrade reliability. The device includes undervoltage lockout (UVLO) that holds output disabled until VIN rises above 1.6 V, ensuring controlled startup behavior.

Does TLV71729PDQNR require an input capacitor for stability?

No, TLV71729PDQNR does not require an input capacitor for stability, but TI strongly recommends a 0.1–1-µF low-ESR ceramic capacitor between IN and GND. This improves transient response, reduces input ripple coupling, and mitigates voltage excursions caused by source inductance - especially critical in battery-fed or DC/DC-supplied systems.

How does the foldback current limit function in TLV71729PDQNR?

In TLV71729PDQNR, foldback current limiting reduces output current as output voltage drops - initiating near 350 mA and decreasing to ~40 mA under short-circuit conditions. This lowers power dissipation in the PMOS pass element during faults, preventing thermal runaway. Unlike fixed current limits, foldback minimizes (VIN – VOUT) × ILIMIT heating, enhancing fault resilience.

Can TLV71729PDQNR operate with a 0.1-µF output capacitor?

Yes, TLV71729PDQNR is explicitly designed to be stable with an effective output capacitance of ≥0.1 µF - including derated values of X5R/X7R ceramics under bias and temperature. A 1-µF capacitor is recommended for typical applications, but 0.1-µF enables smaller footprints and lower BOM cost in size-constrained designs, provided the effective capacitance meets the minimum.

What is the purpose of the thermal pad on the TLV71729PDQNR DQN package?

The exposed thermal pad on the TLV71729PDQNR's 4-pin X2SON (DQN) package must be soldered to a GND-connected copper plane to improve thermal performance. It reduces junction-to-board thermal resistance (RθJB = 330°C/W) and enables safe operation at full 150-mA load in ambient temperatures up to +85°C - critical for sustained performance in sealed or thermally isolated enclosures.