Texas Instruments TLV74315PDQNR

Overview

TLV74315PDQNR from Texas Instruments is a 300-mA, low-dropout linear regulator (LDO) with fixed 1.5-V output, 125-mV dropout at 300 mA (V_OUT = 3.3 V), ±1.4% output accuracy over –40°C to +125°C, 34-µA quiescent current, and stable operation with only a 1-µF ceramic output capacitor. It serves as a primary power rail for low-power microcontrollers and sensor interfaces in space-constrained portable electronics.

For engineers reviewing the TLV74315PDQNR datasheet, TLV74315PDQNR pinout, TLV74315PDQNR application, or TLV74315PDQNR equivalent, key selection criteria include its X2SON-4 package footprint, active output discharge capability, foldback current limiting, UVLO behavior, and compatibility with ultra-low-ESR ceramic capacitors in battery-powered systems.

Technical Context

The TLV74315PDQNR implements a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse-current blocking. Its internal bandgap reference, error amplifier, and UVLO circuit operate across 1.4 V to 5.5 V input range while maintaining regulation down to 1.5 V output.

Functional modes include normal regulation, dropout (triode-region pass device), and disabled state with active 120-Ω pulldown resistor. Thermal shutdown triggers at ~160°C junction temperature and resets at ~140°C, with foldback current limiting reducing output current as V_OUT collapses during overload.

Key Specifications

Pinout & Package

X2SON-4 (DQN) package: 1.00 mm × 1.00 mm body, 0.5-mm pitch, exposed thermal pad electrically tied to GND - enables high thermal performance in ultra-dense layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV74315PDBVR and TPS7A0515PDQNR, TLV74315PDQNR uniquely balances 300-mA capability, active discharge, and X2SON-4 footprint-making it the optimal choice for space-constrained, dynamically switched 1.5-V rails in portable and industrial edge nodes.

Availability

TLV74315PDQNR is available at Aetrix Electronics and suitable for wearable health sensors, BLE wireless modules, industrial temperature transmitters, and smart home motion detectors requiring stable component supply across high-mix, low-volume production runs.

Supply support for TLV74315PDQNR 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, embedded processing, and connectivity technologies, with decades of leadership in power management innovation.

The TLV743P family was designed specifically for ultra-low-power, space-constrained portable electronics-delivering high accuracy, low dropout, and minimal external components without sacrificing reliability or thermal performance.

FAQ

What is the maximum input voltage rating for TLV74315PDQNR?

The absolute maximum input voltage for TLV74315PDQNR is 6 V, but recommended operating range is 1.4 V to 5.5 V. Exceeding 6 V risks permanent damage per Absolute Maximum Ratings. Operation above 5.5 V may cause excessive power dissipation or violate thermal limits, especially at high ambient temperatures or full load.

Does TLV74315PDQNR require an external pull-up resistor on the EN pin?

No, TLV74315PDQNR has no internal pull-up or pull-down on the EN pin. If enable functionality is not needed, connect EN directly to IN. An external pull-up is only required when interfacing with open-drain or weak-drive controllers; standard CMOS GPIOs driving >0.9 V (high) or <0.35 V (low) operate TLV74315PDQNR reliably without additional components.

Can TLV74315PDQNR safely drive a 1.5-V load requiring 300 mA continuously?

Yes, TLV74315PDQNR is rated for 300 mA continuous output current under recommended conditions (T_J ≤ 125°C). At 300 mA and 1.5-V output with 3.3-V input, power dissipation is ~0.54 W. With proper PCB thermal design (exposed pad soldered to GND plane), junction temperature remains within safe limits in typical ambient conditions.

Is the thermal pad of TLV74315PDQNR electrically connected internally?

Yes, the exposed thermal pad of TLV74315PDQNR is electrically connected to the GND node inside the package. It must be soldered to the PCB's ground plane to ensure both thermal performance and electrical integrity. Leaving the pad unconnected degrades thermal resistance by >100°C/W and may cause instability or premature thermal shutdown.

What happens to the output when TLV74315PDQNR is disabled via the EN pin?

When TLV74315PDQNR is disabled (EN < 0.35 V), the internal 120-Ω pulldown resistor connects OUT to GND, actively discharging the output capacitor. Discharge time depends on C_OUT and parallel load resistance; for example, with 1 µF and no load, V_OUT falls from 1.5 V to 0.1 V in ~2.8 ms. This prevents floating states and ensures deterministic power sequencing.