Texas Instruments TLV74311PDQNR

Overview

TLV74311PDQNR from Texas Instruments is a 300-mA, ultra-low-quiescent-current low-dropout (LDO) regulator in a 4-pin X2SON package, delivering fixed 1.1 V output with 1.4% max accuracy, 125 mV dropout at 300 mA (for 3.3 V variant), and stable operation using only a 1-µF ceramic output capacitor. It serves as a power-management IC for battery-sensitive portable electronics requiring fast startup and active output discharge.

For engineers reviewing the TLV74311PDQNR datasheet, TLV74311PDQNR pinout, TLV74311PDQNR application, or TLV74311PDQNR equivalent, key selection criteria include its 34 µA quiescent current, foldback overcurrent protection, thermal shutdown at 160°C, and compatibility with low-ESR ceramic capacitors in space-constrained designs.

Technical Context

The TLV74311PDQNR employs a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse-voltage blocking via its intrinsic body diode. Its internal undervoltage lockout (UVLO) activates below 1.25 V (falling) and releases above 1.3 V (rising), preventing erratic behavior during brownout conditions.

It integrates an active pulldown circuit (120 Ω) on the OUT pin during shutdown, ensuring rapid discharge of output capacitance, and features foldback current limiting that reduces output current as VOUT collapses-e.g., delivering ~150 mA into a short at 1.1 V-thereby limiting thermal stress during faults.

Key Specifications

Pinout & Package

TLV74311PDQNR is housed in a 1.00 mm × 1.00 mm, 4-pin X2SON (DQN) package with exposed thermal pad electrically tied to GND. The compact footprint supports high-density PCB layouts in mobile and wearables.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F0TESK and MCP1700T-1102E/TT, TLV74311PDQNR uniquely balances ultra-small size, 300 mA capability, active discharge, and foldback protection - making it optimal for miniaturized, battery-sensitive consumer and industrial edge devices where reliability and layout efficiency are co-prioritized.

Availability

TLV74311PDQNR is available at Aetrix Electronics and suitable for smartphone camera modules, wearable biosensors, BLE edge nodes, and portable medical diagnostics requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for TLV74311PDQNR 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in high-reliability silicon design.

The TLV743P series was developed specifically for ultra-low-power, space-constrained portable electronics - emphasizing minimal quiescent current, small-footprint packaging, and robust fault protection without compromising regulation accuracy or transient response.

FAQ

What is the output voltage tolerance of TLV74311PDQNR over temperature and load?

The TLV74311PDQNR guarantees ±1.4% maximum output voltage deviation across –40°C to +125°C junction temperature and 0–300 mA load current, with typical accuracy of ±1% at 25°C. This tight tolerance ensures reliable operation of 1.1 V I/O domains in modern low-voltage MCUs and sensors without external trimming.

Does TLV74311PDQNR require an input capacitor, and if so, what value is recommended?

Yes - TI recommends a minimum 1-µF X7R ceramic capacitor from IN to GND, placed as close as possible to the TLV74311PDQNR pins. This stabilizes the input rail, improves PSRR, and prevents oscillation during line transients; larger values (e.g., 4.7 µF) further reduce input ripple but are not required for stability.

Can TLV74311PDQNR be used with input voltages below 1.4 V?

No - the absolute minimum input voltage is 1.4 V per recommended operating conditions. Below this, the device enters undervoltage lockout (UVLO) and disables output; the falling UVLO threshold is 1.25 V, meaning operation ceases before reaching 1.4 V. For sub-1.4 V inputs, a different regulator family must be selected.

How does the foldback current limit behave in TLV74311PDQNR during a short-circuit event?

During a short at the OUT pin, TLV74311PDQNR reduces output current to ~150 mA (typ.) at 1.1 V, significantly lower than its 300 mA rating. This foldback action limits power dissipation in the PMOS pass device, delaying thermal shutdown and enabling safe recovery once the fault is removed - critical for protecting battery-fed systems.

Is the thermal pad of TLV74311PDQNR electrically connected, and how should it be handled on the PCB?

Yes - the exposed thermal pad on the TLV74311PDQNR is electrically connected to GND. It must be soldered to a dedicated PCB GND plane using ≥4 thermal vias (0.3 mm diameter) to achieve the specified RθJB = 164.9°C/W. Leaving it floating or unconnected degrades thermal performance and risks premature thermal shutdown under load.