Texas Instruments TLV73315PDQNT

Overview

TLV73315PDQNT from Texas Instruments is a capacitor-free, 300-mA, low-dropout linear regulator (LDO) in a 1-mm × 1-mm X2SON-4 package, delivering 1.5 V output with 1.4% max accuracy, 125 mV dropout at 300 mA (V_OUT = 3.3 V), and 34 µA quiescent current. It enables compact power rails in space-constrained portable electronics where input/output capacitors are omitted.

For engineers reviewing the TLV73315PDQNT datasheet, TLV73315PDQNT pinout, TLV73315PDQNT application, or TLV73315PDQNT equivalent, key selection criteria include capacitor-free stability, active output discharge, foldback current limiting, thermal shutdown behavior, and compatibility with 1.4–5.5 V input sources in ultra-small footprint designs.

Technical Context

The TLV73315PDQNT uses a PMOS pass transistor architecture with undervoltage lockout (UVLO) activation at 1.3 V (rising) and deactivation at 1.25 V (falling), and an active-high enable pin with V_EN(HI) = 0.9 V and V_EN(LO) = 0.35 V. It integrates a 120-Ω active pull-down circuit for rapid output discharge during disable.

Its capacitor-free design eliminates mandatory external C_OUT, reducing solution size and eliminating inrush current at startup-while remaining stable with optional 1-µF ceramic output capacitors. Foldback current limiting initiates during startup or overload, reducing output current as V_OUT drops, with short-circuit current limited to 150–170 mA depending on V_OUT.

Key Specifications

Pinout & Package

TLV73315PDQNT is housed in a 1.0-mm × 1.0-mm, 4-pin X2SON package (DQN) with exposed thermal pad electrically tied to GND. The package supports high-density PCB layouts and provides low thermal resistance (R_θJA = 218.6°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73315PDQNT, TLV73315PDBVR offers identical regulation performance in a larger, more thermally robust SOT-23 package, while TPS7A0515PDQNR trades capacitor-free operation and active discharge for lower quiescent current-making TLV73315PDQNT optimal for ultra-compact, fast-sequencing, capacitor-minimized systems.

Availability

TLV73315PDQNT is available at Aetrix Electronics and suitable for mobile power management, wearable sensor hubs, industrial edge nodes, and USB-C peripheral power requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TLV73315PDQNT 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 leader specializing in analog and embedded processing technologies, with decades of LDO innovation and broad automotive, industrial, and consumer qualification.

The TLV733 series was designed specifically for space- and power-constrained portable electronics, emphasizing capacitor-free operation, ultra-low IQ, and fast transient response in sub-1-mm² packages.

FAQ

What is the minimum input voltage required for TLV73315PDQNT to regulate 1.5 V at 300 mA?

The TLV73315PDQNT requires input voltage ≥1.77 V at 300 mA under worst-case conditions (–40°C to +125°C), based on its maximum dropout voltage of 270 mV for 1.5-V output. At room temperature, dropout is typically lower-enabling regulation from as low as 1.65 V. Input must also exceed UVLO rising threshold (1.3 V) before regulation begins.

Does TLV73315PDQNT require input or output capacitors to operate stably?

No-TLV73315PDQNT is explicitly designed for capacitor-free operation and remains stable without mandatory C_IN or C_OUT. A small ceramic capacitor (e.g., 1 µF) on OUT is optional and improves load transient response but is not required for stability. No input capacitor is needed, though a small one is recommended for local decoupling.

How does the active output discharge function work in TLV73315PDQNT?

When TLV73315PDQNT is disabled via the EN pin, an internal 120-Ω MOSFET pulldown connects OUT to GND. Discharge time depends on output capacitance and parallel load resistance per τ = (120 Ω ∥ R_L) × C_OUT. For example, with 1 µF C_OUT and no load, V_OUT discharges to <10% in ~120 µs-enabling safe multi-rail power-down sequencing.

What protection features are integrated into TLV73315PDQNT?

TLV73315PDQNT integrates foldback current limiting (reducing output current as V_OUT drops), thermal shutdown (~160°C trip, ~140°C reset), undervoltage lockout (1.3 V rise / 1.25 V fall), and active output discharge. It does not include reverse-current blocking or overvoltage protection-external diodes or TVS may be needed for those functions.

Can TLV73315PDQNT be used with a 1.2-V GPIO to control the EN pin?

Yes-TLV73315PDQNT's EN pin has V_EN(HI) = 0.9 V (min) and V_EN(LO) = 0.35 V (max), making it fully compatible with 1.2-V logic. A 1.2-V GPIO high signal exceeds the 0.9-V enable threshold with 300-mV noise margin, and a low signal (0 V) is well below the 0.35-V disable threshold-no level-shifting circuitry is required.