Texas Instruments TLV74115PDQNR

Overview

TLV74115PDQNR from Texas Instruments is a 150-mA, low-dropout linear regulator (LDO) with foldback current limit, designed for power-sensitive portable applications. It delivers 1.5-V fixed output voltage, achieves 230 mV dropout at 150 mA, maintains ±1% DC accuracy over –40°C to +125°C, and operates from 1.4 V to 5.5 V input. It powers microcontrollers like MSP430 in battery-powered handheld devices.

For engineers reviewing the TLV74115PDQNR datasheet, TLV74115PDQNR pinout, TLV74115PDQNR application, or TLV74115PDQNR equivalent, key selection criteria include its 1.5-V fixed output, 50 µA quiescent current, active output discharge, stability with 1-µF ceramic capacitors, and thermal shutdown at 158°C - all critical for compact, low-power embedded designs.

Technical Context

The TLV74115PDQNR uses a PMOS pass transistor enabling ultra-low dropout and inherent reverse-voltage protection via its body diode. Its internal UVLO disables output until VIN exceeds ~1.4 V, and its enable pin (active-high, 0.9 V threshold) controls startup/shutdown with 120-Ω active pulldown during disable.

It implements foldback current limiting: output current reduces as VOUT drops during overload, delivering ~40 mA into short-circuit while preventing thermal runaway. Thermal shutdown activates at 158°C and resets at 140°C, enabling safe fault cycling without external intervention.

Key Specifications

Pinout & Package

TLV74115PDQNR is packaged in a 4-pin X2SON (DQN) with 1.00 mm × 1.00 mm body size and exposed thermal pad electrically tied to GND. The thermal pad must be soldered to a PCB ground plane for optimal thermal performance (R_θJB = 174.7°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV74115PDQNR, TLV74115PDBVR offers identical electrical specs but higher thermal resistance and larger footprint, while TPL7407LPDQNR serves a completely different functional role - making TLV74115PDQNR the sole direct LDO alternative in the X2SON 1.5-V, 150-mA class.

Availability

TLV74115PDQNR is available at Aetrix Electronics and suitable for wearable health monitors, industrial sensor nodes, portable barcode scanners, and smart home motion detectors requiring stable component supply across production lifecycles.

Supply support for TLV74115PDQNR 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 and precision analog solutions.

The TLV741P family was engineered for ultra-low-power, space-constrained portable electronics - delivering high PSRR, low dropout, and foldback protection in sub-1-mm² packages for battery-operated microcontroller systems.

FAQ

What is the output voltage tolerance of TLV74115PDQNR over temperature?

The TLV74115PDQNR maintains ±1% DC output accuracy over the full operating junction temperature range of –40°C to +125°C for VOUT ≥ 1.8 V. Since TLV74115PDQNR is a 1.5-V variant, its specification falls under the "VOUT < 1.8 V" category: ±20 mV at TJ = 25°C and ±50 mV over –40°C to +125°C. This tight tolerance ensures reliable operation of 1.5-V logic and analog circuits without external trimming. TLV74115PDQNR's accuracy is verified per TI's SBVS309A datasheet Section 6.5.

Does TLV74115PDQNR support active output discharge, and how does it work?

Yes, TLV74115PDQNR provides active output discharge via an internal 120-Ω pulldown resistor that engages when the EN pin is driven below 0.4 V. This rapidly discharges the output capacitor (C_OUT) to ground, preventing floating or unintended biasing of downstream circuitry during power-down sequences. The discharge time constant depends on C_OUT and parallel load resistance (τ ≈ 120 Ω × C_OUT). TLV74115PDQNR's pulldown is confirmed in Section 7.3.2 of the official datasheet.

Can TLV74115PDQNR operate with input voltages below 1.5 V?

No - TLV74115PDQNR requires a minimum input voltage of 1.4 V to power internal circuitry, but regulation to 1.5 V is only possible when VIN exceeds VOUT plus dropout voltage. At 150 mA, dropout is 230 mV, so minimum VIN for regulation is 1.73 V. Below that, the device enters dropout mode (output tracks input minus VDO) or UVLO if VIN < 1.4 V. This behavior is defined in Sections 6.3 and 7.4.2 of the TLV74115PDQNR datasheet.

What is the maximum allowable output capacitance for TLV74115PDQNR?

The TLV74115PDQNR is stable with output capacitances from 1 µF up to 100 µF, as specified in Section 6.3 (Recommended Operating Conditions). Larger values improve transient response but increase inrush current at startup. TI recommends X5R or X7R ceramic capacitors for minimal ESR and temperature drift. Exceeding 100 µF is not prohibited but may require validation of start-up time and current-limit behavior - details are in Section 8.1.1 of the TLV74115PDQNR datasheet.

Is TLV74115PDQNR pin-compatible with other TLV741P variants in the same package?

Yes - all TLV741P variants in the DQN (X2SON-4) package share identical pinout: Pin 1 = OUT, Pin 2 = GND, Pin 3 = EN, Pin 4 = IN. This includes TLV74115PDQNR (1.5 V), TLV74118PDQNR (1.8 V), and TLV74133PDQNR (3.3 V). Electrical differences are limited to output voltage and corresponding dropout characteristics; no PCB redesign is needed when swapping fixed-output versions. Confirmed in Section 5 (Pin Configuration) of the TLV741P datasheet SBVS309A.