Texas Instruments TLV77318PDQNR

Overview

TLV77318PDQNR from Texas Instruments is a 300mA, fixed 1.8V output low-dropout linear regulator in a 1mm × 1mm X2SON-4 (DQN) package. It delivers high PSRR (72dB at 1kHz), 2% output voltage accuracy, and 180mV dropout at 300mA - enabling stable power for noise-sensitive analog and RF circuitry in space-constrained portable electronics.

For engineers reviewing the TLV77318PDQNR datasheet, TLV77318PDQNR pinout, TLV77318PDQNR application, or TLV77318PDQNR equivalent, key selection criteria include its ultra-small footprint, active output discharge, foldback current limiting, and operation down to 1.4V input - critical for battery-powered systems with tight thermal and layout constraints.

Technical Context

The TLV77318PDQNR integrates a CMOS pass transistor with internal soft-start and an active pulldown MOSFET for rapid output discharge during disable. Its error amplifier and bandgap reference support regulation across −40°C to +125°C junction temperature, with stability ensured using ≥0.47µF ceramic output capacitance.

It operates in three functional modes: normal regulation (VIN ≥ VOUT + VDO), dropout (VIN < VOUT + VDO, output tracks input), and disabled (EN < 0.3V, output actively pulled to GND via 135Ω internal resistor). Thermal shutdown triggers at 160°C with 20°C hysteresis.

Key Specifications

Pinout & Package

TLV77318PDQNR uses the 1mm × 1mm, 4-pin X2SON (DQN) package with exposed thermal pad. The compact footprint and bottom-side thermal pad enable high-density PCB layouts while supporting efficient heat dissipation when soldered to a ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV77318PDQNR, TPL7407LPGQDR serves a fundamentally different function (driver vs regulator), while MCP1703T-1802E/MB offers comparable regulation but lacks the ultra-small footprint, active discharge, and superior PSRR needed for high-performance portable audio and imaging.

Availability

TLV77318PDQNR is available at Aetrix Electronics and suitable for smartphone power rails, camera module bias, gaming console SoC I/O, streaming media player audio, and set-top box subsystems requiring stable component supply with consistent lead times and full traceability.

Supply support for TLV77318PDQNR 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, embedded processing, and power management ICs, with decades of LDO design expertise and broad automotive, industrial, and consumer qualification.

The TLV773 family was engineered for space-constrained, battery-powered applications demanding high PSRR, low quiescent current, and fast enable/disable control - targeting next-generation mobile, imaging, and portable audio systems.

FAQ

What is the maximum output current capability of the TLV77318PDQNR?

The TLV77318PDQNR delivers up to 300mA of continuous output current under recommended operating conditions (TJ ≤ 125°C, VIN ≥ VOUT + VDO). Its foldback current limit activates at 350–720mA, and short-circuit current is typically 65mA - providing robust fault protection without external components. This makes TLV77318PDQNR suitable for powering multiple low-power peripherals in portable devices.

Does TLV77318PDQNR require external capacitors for stability?

Yes, TLV77318PDQNR requires a minimum 0.47µF ceramic output capacitor (COUT) and recommends a 1µF input capacitor (CIN) for optimal transient response and PSRR. The device is stable with low-ESR ceramics (X7R/X5R/C0G) and does not require tantalum or electrolytic types. Effective COUT must remain ≥0.47µF after derating for voltage/temperature - a 1µF nominal X7R capacitor typically meets this requirement.

How does the active discharge feature work in TLV77318PDQNR?

When the EN pin falls below 0.3V, TLV77318PDQNR activates an internal 135Ω pulldown resistor between OUT and GND, rapidly discharging the output capacitor. This ensures a known low-voltage state before re-enabling, preventing latch-up or undefined behavior in downstream logic. The discharge time depends on COUT value - e.g., a 1µF capacitor discharges to <10% VOUT in ~3.5µs - making TLV77318PDQNR ideal for power-sequenced systems.

What is the dropout voltage specification for TLV77318PDQNR at full load?

At 300mA output current and TJ = –40°C to +85°C, TLV77318PDQNR exhibits a maximum dropout voltage of 245mV in the DQN package. At room temperature, it is typically 180mV. This low dropout enables operation from weak or aging batteries - for example, maintaining regulation down to 2.045V input when supplying 1.8V at 300mA - a key advantage over legacy LDOs with >300mV dropout.

Is TLV77318PDQNR compatible with standard PCB assembly processes?

Yes, TLV77318PDQNR's X2SON-4 package is compatible with standard reflow soldering per JEDEC J-STD-020. Its 1mm × 1mm body and 0.35mm pitch allow fine-pitch placement, and the thermal pad requires stencil-defined solder paste coverage (≥70%) and ≥6 thermal vias connected to a solid ground plane. TI provides detailed layout guidelines - including avoiding vias directly under the thermal pad - ensuring reliable solder joints and thermal performance in high-volume manufacturing.