Texas Instruments TLV74310PDQNR

Overview

TLV74310PDQNR from Texas Instruments is a 300-mA, 1-V fixed-output low-dropout linear regulator (LDO) in a 4-pin X2SON package (1.0 mm × 1.0 mm), featuring 125 mV dropout at 300 mA (V_OUT = 3.3 V), ±1.4% output accuracy over –40°C to +125°C, and 34 µA quiescent current - optimized for space-constrained battery-powered applications such as camera modules and WLAN add-on cards.

For engineers reviewing the TLV74310PDQNR datasheet, TLV74310PDQNR pinout, TLV74310PDQNR application, or TLV74310PDQNR equivalent, key selection criteria include ultra-low quiescent current, stable operation with 1-µF ceramic output capacitor, active output discharge, foldback overcurrent protection, and thermal shutdown behavior at 160°C junction temperature.

Technical Context

The TLV74310PDQNR implements a PMOS pass transistor architecture enabling low dropout and inherent reverse-current blocking. Its internal bandgap reference and error amplifier deliver 1% typical DC accuracy, while UVLO (1.25–1.4 V thresholds) prevents erratic startup below operational input range.

Functional modes include normal regulation, dropout (triode-region pass device), and disabled state with active 120-Ω pulldown resistor discharging the output. Foldback current limiting reduces output current as V_OUT collapses - delivering ~150 mA into short-circuit at 1 V output - and thermal shutdown cycles between 140°C (reset) and 160°C (trip).

Key Specifications

Pinout & Package

TLV74310PDQNR uses the DQN (X2SON-4) package: 1.00 mm × 1.00 mm body with exposed thermal pad electrically tied to GND. The thermal pad must be soldered to a PCB ground plane for optimal thermal performance (R_θJB = 164.9°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL74010PDQNR and TPS7A0510PDQNR, TLV74310PDQNR delivers the best balance of ultra-low IQ (34 µA), active discharge, 1-µF stability, and 300-mA capability in the smallest 1-mm² footprint - making it optimal for next-generation portable imaging and connectivity subsystems.

Availability

TLV74310PDQNR is available at Aetrix Electronics and suitable for camera modules, WLAN add-on cards, portable industrial sensors, and smartphone subsystems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TLV74310PDQNR 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 and industrial applications.

The TLV743P family was designed specifically for ultra-low-power, space-constrained battery-operated devices - emphasizing minimal quiescent current, small-footprint packaging, and robust protection features without sacrificing regulation accuracy or transient response.

FAQ

What is the maximum input voltage rating for TLV74310PDQNR?

The absolute maximum input voltage for TLV74310PDQNR 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 below 1.4 V triggers undervoltage lockout (UVLO), disabling regulation until VIN rises above 1.4 V (rising threshold). The TLV74310PDQNR must never be operated outside these boundaries to ensure reliability and specification compliance.

Does TLV74310PDQNR require an external pull-up resistor on the EN pin?

No, TLV74310PDQNR has no internal pull-up or pull-down on the EN pin. If enable functionality is not needed, connect EN directly to IN to maintain regulation. Adding an external pull-up is unnecessary and may cause unintended behavior if driven by open-drain logic. The TLV74310PDQNR only requires EN ≥ 0.9 V to enable and EN ≤ 0.35 V to disable - verified across temperature and process corners.

Can TLV74310PDQNR safely drive a 1-µF ceramic output capacitor?

Yes - TLV74310PDQNR is explicitly characterized and guaranteed stable with ≥1-µF ceramic output capacitors, including X5R and X7R types. This eliminates need for larger, less reliable tantalum or aluminum electrolytic capacitors. Stability is maintained across temperature, load, and input voltage ranges per TI's SBVS310C datasheet Figure 2 and Section 8.2. Using 1 µF reduces PCB area and cost versus legacy LDOs requiring 10–22 µF.

What happens to the output when TLV74310PDQNR is disabled via EN?

When TLV74310PDQNR is disabled (EN < 0.35 V), its internal 120-Ω pulldown resistor actively discharges the OUT pin to GND. Discharge time depends on output capacitance and parallel load resistance, per τ ≈ R_pulldown ∥ R_load × C_OUT. This feature ensures rapid, controlled voltage collapse - critical for secure subsystem reset and preventing back-powering of upstream circuitry. The TLV74310PDQNR does not float the output.

Is TLV74310PDQNR compatible with lead-free reflow processes?

Yes - TLV74310PDQNR is packaged in RoHS-compliant, lead-free X2SON-4 (DQN) with NiPdAu terminal finish, qualified for standard Pb-free reflow profiles (J-STD-020, peak temperature ≤ 260°C). The 1.0 mm × 1.0 mm body and exposed thermal pad are designed for reliable solder joint formation under IPC-A-610 Class 2/3 requirements. No special assembly precautions beyond standard X2SON handling are needed for TLV74310PDQNR.