Texas Instruments TLV74312PDQNR3

Overview

TLV74312PDQNR3 from Texas Instruments is a 300-mA, 1.2-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, ±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 smartphone PMIC rails.

For engineers reviewing the TLV74312PDQNR3 datasheet, TLV74312PDQNR3 pinout, TLV74312PDQNR3 application, or TLV74312PDQNR3 equivalent, key selection criteria include ultra-low quiescent current, stable operation with only 1-µF ceramic output capacitance, active output discharge, foldback current limiting, and thermal shutdown protection - all critical for portable, low-power embedded power management.

Technical Context

The TLV74312PDQNR3 uses a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse-current blocking. Its internal undervoltage lockout (UVLO) engages below 1.25 V (falling) and releases above 1.3 V (rising), preventing erratic startup under weak input sources.

Functional modes include normal regulation, dropout operation (where VOUT = VIN – VDO), and disabled state with active 120-Ω pulldown resistor discharging the output. Thermal shutdown triggers at ~160°C and resets at ~140°C, with foldback current limiting reducing output current as VOUT collapses during overload.

Key Specifications

Pinout & Package

TLV74312PDQNR3 is housed in a 4-pin X2SON (DQN) package measuring 1.00 mm × 1.00 mm with an exposed thermal pad electrically connected to GND - requiring solder connection to PCB ground plane for optimal thermal performance (RθJB = 164.9°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F0TESK and TPS7A0512PDQNR, TLV74312PDQNR3 delivers the best balance of 300-mA capability, 125-mV dropout, and 1.0-mm² footprint - making it ideal for consumer portable designs where space, efficiency, and cost are tightly coupled.

Availability

TLV74312PDQNR3 is available at Aetrix Electronics and suitable for smartphone camera modules, wearable health sensors, industrial IoT edge nodes, and tablet SoC core rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TLV74312PDQNR3 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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.

The TLV743P family was engineered for ultra-low-power, space-constrained portable electronics - delivering high accuracy, low dropout, and active discharge in sub-1-mm² packages to extend battery life and simplify power architecture.

FAQ

What is the maximum input voltage rating for TLV74312PDQNR3?

The absolute maximum input voltage for TLV74312PDQNR3 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 in the compact X2SON package.

Does TLV74312PDQNR3 require an input capacitor?

Yes, TLV74312PDQNR3 requires a small ceramic input capacitor (typically 1 µF) from IN to GND to suppress high-frequency noise and stabilize the input source impedance. While not strictly mandatory for basic regulation, omission increases susceptibility to line transients and may degrade PSRR performance in noisy environments.

Can TLV74312PDQNR3 be used without connecting the thermal pad?

No - the exposed thermal pad on TLV74312PDQNR3 is electrically connected to GND and must be soldered to a PCB ground plane. Omitting this connection degrades thermal resistance by >100°C/W, significantly increasing junction temperature and risking premature thermal shutdown or reduced reliability under 300-mA load.

What happens to the output when TLV74312PDQNR3 is disabled via EN?

When TLV74312PDQNR3 is disabled (EN < 0.35 V), its internal 120-Ω pulldown resistor actively discharges the output node to GND. Discharge time depends on output capacitance and parallel load resistance; for example, with 1 µF COUT and no external load, VOUT falls to <10% in ~1.2 ms.

Is TLV74312PDQNR3 compatible with ceramic capacitors smaller than 1 µF?

No - TI specifies stable operation only with ≥1 µF ceramic output capacitance (X5R/X7R). Using smaller values (e.g., 0.47 µF) risks instability, oscillation, or degraded load transient response, as confirmed in the "Stability Requirements" section of the SBVS310C datasheet.