Texas Instruments TLV74111PDQNR

Overview

TLV74111PDQNR from Texas Instruments is a 150-mA, low-dropout linear regulator (LDO) with foldback current limit, designed for power-sensitive portable applications. It delivers 1.1 V fixed output at ±1.5% accuracy over –40°C to +125°C, features 230 mV dropout at 150 mA, 50 µA quiescent current, and stable operation with 1-µF ceramic output capacitors. It is used in battery-powered microcontroller subsystems requiring precise, low-noise biasing.

For engineers reviewing the TLV74111PDQNR datasheet, TLV74111PDQNR pinout, TLV74111PDQNR application, or TLV74111PDQNR equivalent, key selection criteria include its 1.1 V fixed output, active output discharge capability (P-version), thermal shutdown at 158°C, foldback current limiting, and compatibility with ultra-small X2SON-4 packaging for space-constrained designs.

Technical Context

The TLV74111PDQNR employs a PMOS pass transistor enabling very low dropout and inherent reverse-voltage protection via its body diode. Its internal UVLO circuit disables output until VIN exceeds minimum operating voltage, while an active pulldown resistor (120 Ω) discharges the output during shutdown.

It integrates foldback current limiting-reducing output current as VOUT collapses-and thermal shutdown that cycles between 158°C trip and 140°C reset points. The device operates across –40°C to +125°C junction temperature and supports input voltages from 1.4 V to 5.5 V.

Key Specifications

Pinout & Package

TLV74111PDQNR is packaged in a 4-pin X2SON (DQN) with 1.00 mm × 1.00 mm body size and exposed thermal pad electrically connected to GND. The package supports high-density PCB layouts and enhanced thermal performance when the pad is soldered to a ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV74111PDBVR, TLV74111PDQNR offers superior thermal performance and 30% smaller footprint but requires X2SON reflow expertise; compared with TPL7407LPDQNR, it provides dedicated low-noise 1.1 V regulation without driver functionality-making it optimal for MCU core and sensor biasing where precision and efficiency are primary.

Availability

TLV74111PDQNR is available at Aetrix Electronics and suitable for wearable sensor nodes, low-power MCU core supplies, industrial IoT edge nodes, and medical diagnostic handhelds requiring stable component supply across long-lifecycle production programs.

Supply support for TLV74111PDQNR 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TLV741P family was designed specifically for ultra-low-power, space-constrained portable applications-emphasizing low dropout, minimal quiescent current, and robust fault protection in miniature packages.

FAQ

What is the output voltage tolerance of TLV74111PDQNR over temperature?

The TLV74111PDQNR maintains ±1.5% output voltage accuracy across the full operating junction temperature range of –40°C to +125°C for VOUT ≥ 1.2 V. At 1.1 V output, this specification applies directly-ensuring reliable core biasing for low-voltage MCUs and sensors without external trimming. This tolerance is guaranteed by TI's production testing and is documented in Section 6.5 of the SBVS309A datasheet. TLV74111PDQNR achieves this stability through precision bandgap and error amplifier design.

Does TLV74111PDQNR support active output discharge, and how does it work?

Yes, TLV74111PDQNR includes active output discharge. When the EN pin is driven below 0.4 V, an internal 120-Ω pulldown resistor connects the OUT pin to GND, rapidly discharging external output capacitance. Discharge time depends on COUT and parallel load resistance per τ = 120·RL/(120 + RL)·COUT. This feature prevents floating outputs and unintended wake-up in battery-powered systems. TLV74111PDQNR implements this function identically to other "P"-suffix variants in the TLV741P family.

What is the maximum input voltage rating for TLV74111PDQNR?

The absolute maximum input voltage for TLV74111PDQNR is 6 V, as specified in Section 6.1 of the SBVS309A datasheet. However, the recommended operating range is 1.4 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or accelerated parametric drift. Operation at 6 V is strictly limited to transient conditions and must not exceed 100 ns per occurrence. TLV74111PDQNR includes internal UVLO that disables output below ~1.2 V input, protecting downstream circuitry during brownout.

Can TLV74111PDQNR operate with a 1-µF output capacitor, and why is that significant?

Yes, TLV74111PDQNR is explicitly characterized and guaranteed stable with a minimum 1-µF ceramic output capacitor-no ESR requirements or additional compensation needed. This eliminates reliance on larger, more expensive tantalum or polymer capacitors and simplifies layout in space-constrained designs like wearables and hearing aids. The 1-µF stability is enabled by TI's advanced internal control loop architecture. TLV74111PDQNR's ability to maintain phase margin with such small capacitance directly reduces BOM cost and PCB area versus legacy LDOs requiring ≥10 µF.

How does the foldback current limit behave in TLV74111PDQNR during a short-circuit event?

During output short-circuit, TLV74111PDQNR reduces output current progressively as VOUT collapses-unlike constant-current limiters. At full short (VOUT ≈ 0 V), it delivers ~40 mA typical, minimizing power dissipation in the PMOS pass element. This foldback behavior delays thermal shutdown onset and reduces peak junction temperature rise. The current limit threshold is internally set at ~180 mA under normal conditions but decreases with falling VOUT per Equation 2 in the datasheet. TLV74111PDQNR uses this mechanism to protect itself and the PCB during sustained faults without external current-sense circuitry.