Texas Instruments TLV73310PDQNT

Overview

TLV73310PDQNT from Texas Instruments is a capacitor-free, 300-mA, low-dropout linear regulator (LDO) with 1.0-V fixed output, 125-mV dropout at 300 mA (3.3-V variant), ±1.4% output accuracy, and 34-µA quiescent current. It operates from 1.4 V to 5.5 V input and delivers stable regulation in space-constrained portable power rails such as smartphone baseband processors and camera sensor supplies.

For engineers reviewing the TLV73310PDQNT datasheet, TLV73310PDQNT pinout, TLV73310PDQNT application, or TLV73310PDQNT equivalent, key selection criteria include capacitor-free stability, active output discharge, foldback current limiting, and X2SON package thermal performance under transient load conditions.

Technical Context

The TLV73310PDQNT uses a PMOS pass transistor architecture with undervoltage lockout (UVLO) activation at 1.3 V (rising) and 1.25 V (falling), enabling reliable startup in battery-powered systems. Its capacitor-free design eliminates mandatory 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. Thermal shutdown triggers at 160°C and resets at 140°C, with foldback current limiting reducing ILIM as VOUT collapses during short-circuit events.

Key Specifications

Pinout & Package

TLV73310PDQNT is housed in a 1.0-mm × 1.0-mm, 4-pin X2SON (DQN) package with exposed thermal pad electrically tied to GND. The compact footprint supports high-density PCB layouts in mobile and wearable applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC73310PDQNT and TPS73310PDQNT, TLV73310PDQNT delivers 39% lower quiescent current, eliminates mandatory output capacitance, and adds active discharge-enabling tighter power budget control and faster system-level power-state transitions.

Availability

TLV73310PDQNT is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor hub supply, and camera module core bias requiring stable component supply with full production traceability and long-term lifecycle support.

Supply support for TLV73310PDQNT 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 design expertise and broad automotive, industrial, and consumer qualification.

The TLV733 series was developed specifically for ultra-low-power, space-constrained portable electronics - emphasizing capacitor-free operation, sub-100-µA IQ, and robust fault protection in 1-mm² packages.

FAQ

Does TLV73310PDQNT require input or output capacitors to maintain stability?

No, TLV73310PDQNT uses a capacitor-free architecture and remains stable with zero input or output capacitance. However, adding a 1-µF ceramic capacitor on OUT improves load transient response and reduces output noise by up to 30%, especially under dynamic current steps. The device is also stable with larger ceramic capacitors if system EMI filtering is needed.

What is the minimum input voltage required for TLV73310PDQNT to regulate 1.0 V output?

TLV73310PDQNT requires VIN ≥ 1.4 V to operate, per recommended conditions. Due to its undervoltage lockout (UVLO), it will not regulate until VIN rises above 1.3 V (typical). For reliable 1.0-V regulation at 300 mA, VIN must exceed 1.0 V + VDO - which ranges from 260 mV to 460 mV depending on temperature and output voltage variant - so VIN ≥ 1.26 V is necessary in most cases.

How does the active output discharge function work in TLV73310PDQNT?

When EN is pulled low, TLV73310PDQNT engages an internal 120-Ω pulldown resistor between OUT and GND. This discharges the output node exponentially with time constant τ ≈ 120 Ω × C_OUT. For a 1-µF load, discharge to 10% of VOUT takes ~276 µs - enabling fast power-down in systems with strict rail sequencing requirements, such as camera modules and BLE SoCs.

Can TLV73310PDQNT be used with lithium-ion battery input down to 3.0 V?

Yes, TLV73310PDQNT supports input voltages from 1.4 V to 5.5 V, making it fully compatible with single-cell Li-ion batteries (2.7–4.2 V nominal). Its 125-mV dropout at 300 mA for 3.3-V variants - and 260–460 mV for 1.0-V variants - ensures regulation well into battery discharge, down to ~1.26 V input for 1.0-V output, preserving usable capacity.

What thermal performance can be expected from TLV73310PDQNT in a 1.0-mm² X2SON package?

In the DQN (X2SON-4) package, TLV73310PDQNT has R_θJA = 218.6°C/W and R_θJB = 164.9°C/W when the thermal pad is soldered to a 1-in² GND plane. At 300 mA and 1.0-V output with 3.3-V input (2.3-V drop), power dissipation is 690 mW - resulting in ~151°C junction rise above ambient. Proper thermal pad layout keeps TJ within the 125°C max operating limit for continuous operation.