Texas Instruments TLV73311PDQNR

Overview

TLV73311PDQNR from Texas Instruments is a capacitor-free, 300-mA, low-dropout linear regulator (LDO) in a 1.0-mm × 1.0-mm X2SON-4 package, delivering 1.1 V output with 125 mV dropout at 300 mA, ±1.4% output accuracy, and 34 µA quiescent current. It enables compact, low-power power management in space-constrained portable electronics where input/output capacitors are omitted.

For engineers reviewing the TLV73311PDQNR datasheet, TLV73311PDQNR pinout, TLV73311PDQNR application, or TLV73311PDQNR equivalent, key selection criteria include capacitor-free stability, active output discharge, foldback overcurrent protection, thermal shutdown behavior, and enable threshold compatibility with 1.8-V/3.3-V logic systems.

Technical Context

The TLV73311PDQNR uses a PMOS pass transistor architecture with undervoltage lockout (UVLO) activation at 1.3 V (rising) and 1.25 V (falling), enabling reliable startup under weak-battery conditions. Its capacitor-free design eliminates mandatory external output capacitance while maintaining stability across –40°C to +125°C junction temperature.

Functional modes include normal regulation, dropout operation (where VOUT = VIN – VDO), and disabled state with active 120-Ω pull-down on OUT. The device integrates foldback current limiting (360–700 mA ILIM), thermal shutdown (160°C trip, 140°C reset), and active discharge-critical for sequencing and battery-backed systems.

Key Specifications

Pinout & Package

TLV73311PDQNR is housed in a 1.0-mm × 1.0-mm, 4-pin X2SON (DQN) package with exposed thermal pad electrically tied to GND. The small footprint supports high-density PCB layouts in mobile and wearable form factors.

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, TLV73311PDQNR uniquely balances 300-mA capability, capacitor-free operation, active discharge, and 34-µA IQ in a 1-mm² footprint-making it optimal for consumer portable devices where size, transient response, and sequencing control are critical.

Availability

TLV73311PDQNR is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor hubs, industrial IoT edge nodes, USB-C peripheral power, and BLE SoC supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TLV73311PDQNR 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 for portable, industrial, and automotive markets.

The TLV733 series was designed specifically for space-constrained, battery-powered applications demanding capacitor-free simplicity, low quiescent current, and robust protection-targeting next-generation smartphones, wearables, and IoT endpoints.

FAQ

Does TLV73311PDQNR require an output capacitor to operate stably?

No, TLV73311PDQNR is architecturally stable without any output capacitor due to its capacitor-free internal compensation. This eliminates inrush current at startup and reduces BOM count. However, adding a 1-µF ceramic capacitor improves transient response and is supported if needed for specific load dynamics.

What is the minimum input voltage required for TLV73311PDQNR to regulate 1.1 V output?

TLV73311PDQNR requires VIN ≥ 1.225 V to maintain regulation at 300 mA load (1.1 V + 125 mV dropout). Below this, UVLO disables regulation until VIN rises above 1.3 V (UVLO rising threshold). At light loads, regulation can begin as low as 1.225 V depending on thermal and process variation.

How does the active output discharge function in TLV73311PDQNR work?

When TLV73311PDQNR is disabled via the EN pin, an internal 120-Ω MOSFET connects OUT to GND. Discharge time depends on output capacitance and parallel load resistance (τ ≈ 120 Ω × COUT || RL). For example, with 1 µF and no load, discharge to 10% VOUT takes ~280 µs.

Can TLV73311PDQNR be used with a 1.8-V enable signal?

Yes. TLV73311PDQNR's EN pin has VEN(HI) = 0.9 V (min) and VEN(LO) = 0.35 V (max), making it fully compatible with standard 1.8-V CMOS logic outputs. No level shifter is needed, simplifying interface design with common microcontrollers and PMICs.

What protection features does TLV73311PDQNR include?

TLV73311PDQNR integrates foldback overcurrent protection (360–700 mA ILIM), thermal shutdown (160°C trip, 140°C reset), undervoltage lockout (1.3 V rising, 1.25 V falling), and active output discharge. These features collectively prevent damage during shorts, overtemperature, brownout, and uncontrolled power-down events.