Texas Instruments TLV71729PDQNT

Overview

TLV71729PDQNT from Texas Instruments is a 150-mA, low-dropout linear regulator with active output discharge, fixed 2.9 V output, 215 mV dropout at full load, 0.5% typical accuracy, and 35 µA quiescent current - designed for power-sensitive portable electronics requiring stable low-noise voltage regulation.

For engineers reviewing the TLV71729PDQNT datasheet, TLV71729PDQNT pinout, TLV71729PDQNT application, or TLV71729PDQNT equivalent, key selection criteria include foldback current limiting (40 mA short-circuit limit), 1-mm × 1-mm X2SON package compatibility, UVLO threshold (1.6 V), PSRR (70 dB @ 1 kHz), and stability with ≥0.1 µF ceramic output capacitance.

Technical Context

The TLV71729PDQNT employs a PMOS pass transistor enabling ultra-low dropout and inherent reverse-current blocking via its integrated body diode. Its internal foldback current limit initiates near 350 mA and reduces short-circuit current to 40 mA, minimizing thermal stress during fault conditions.

It integrates an active pulldown circuit (120 Ω) to rapidly discharge the output upon shutdown, supports enable control with 0.9 V turn-on threshold, and features undervoltage lockout (UVLO) that holds output off until VIN exceeds 1.6 V - ensuring reliable startup in battery-powered systems.

Key Specifications

Pinout & Package

TLV71729PDQNT uses the 4-pin X2SON (DQN) package, measuring 1.00 mm × 1.00 mm with 0.5-mm pitch and an exposed thermal pad connected to GND for enhanced thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV71729PDQNT, TPS7A0529PDQNR offers superior quiescent current but lacks foldback protection, while MCP1700T-2902E/TT trades significant dropout penalty and missing pulldown functionality for broader package availability and lower cost - making TLV71729PDQNT optimal for space-constrained, battery-critical portable designs demanding both efficiency and fault tolerance.

Availability

TLV71729PDQNT is available at Aetrix Electronics and suitable for wearable electronics, Bluetooth modules, industrial handheld scanners, and smart POS terminals requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TLV71729PDQNT 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 specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.

The TLV717P series was developed specifically for power-sensitive portable devices - delivering low IQ, high PSRR, and miniature packaging to extend battery life and shrink form factors in smartphones, wearables, and IoT endpoints.

FAQ

What is the maximum input voltage rating for TLV71729PDQNT?

The absolute maximum input voltage for TLV71729PDQNT 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; operation above 6 V risks permanent damage per the datasheet's Absolute Maximum Ratings table.

Does TLV71729PDQNT require an input capacitor for stability?

No, TLV71729PDQNT does not require an input capacitor for stability, but TI strongly recommends a 0.1 µF to 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 remotely located supplies.

How does the foldback current limit function in TLV71729PDQNT?

In TLV71729PDQNT, foldback current limiting reduces output current as VOUT 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 and enabling safe operation without external current-limiting components.

Can TLV71729PDQNT operate with a 0.1 µF output capacitor?

Yes, TLV71729PDQNT is stable with an effective output capacitance of ≥0.1 µF ceramic, provided the capacitor maintains that value under operating bias and temperature. A 1 µF X5R/X7R ceramic capacitor is recommended for robustness, but properly derated 0.1 µF units (e.g., 0402, 6.3 V rated) are valid for space-constrained designs.

What is the purpose of the thermal pad on the TLV71729PDQNT package?

The exposed thermal pad on the TLV71729PDQNT's X2SON package must be soldered to a PCB ground plane to provide a low-thermal-resistance path from die to ambient. This reduces junction temperature rise by up to 140°C/W (vs. no pad), enabling reliable 150 mA operation in compact layouts without forced airflow or heatsinks.