Texas Instruments TLV77312PDQNR

Overview

TLV77312PDQNR from Texas Instruments is a 300mA, fixed 1.2V 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 - optimized for space-constrained portable power rails in camera modules and mobile SoC core supplies.

For engineers reviewing the TLV77312PDQNR datasheet, TLV77312PDQNR pinout, TLV77312PDQNR application, or TLV77312PDQNR equivalent, key selection criteria include its 1.4V–5.5V input range, active output pulldown, foldback current limit, and compatibility with 0.47µF–40µF ceramic output capacitors in thermally demanding environments up to +125°C junction temperature.

Technical Context

The TLV77312PDQNR integrates a CMOS pass transistor with internal soft-start and an active discharge MOSFET tied to the EN pin. Its error amplifier and bandgap reference enable stable regulation across –40°C to +125°C with minimal external components: only one 1µF input and one 1µF ceramic output capacitor are required for full stability.

It operates in three functional modes - normal regulation, dropout tracking, and disabled (with automatic VOUT discharge) - controlled by EN logic thresholds (VEN(HI) = 0.9V, VEN(LOW) = 0.3V). Thermal shutdown (160°C trip, 140°C reset) and foldback current limiting (ICL = 350–720mA, ISC = 65mA) provide robust fault protection without external circuitry.

Key Specifications

Pinout & Package

TLV77312PDQNR uses the 1mm × 1mm, 4-pin X2SON (DQN) package with exposed thermal pad. The compact footprint reduces PCB area by >75% versus SOT-23 alternatives while enabling superior thermal performance via GND-connected thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC77312DBVR and MCP1703T-1202E/MB, TLV77312PDQNR offers the smallest footprint, lowest dropout, and integrated discharge - making it optimal for next-generation portable electronics where space, efficiency, and sequencing integrity are co-constrained.

Availability

TLV77312PDQNR is available at Aetrix Electronics and suitable for camera modules, mobile SoC I/O supplies, and HDMI PHY power rails requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp.

Supply support for TLV77312PDQNR 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 qualification.

The TLV773 family was engineered for ultra-compact, high-PSRR power delivery in portable and imaging systems - targeting applications where traditional LDOs compromise between size, noise rejection, and thermal performance.

FAQ

What is the maximum input voltage for TLV77312PDQNR?

The absolute maximum input voltage for TLV77312PDQNR is 6.5V, but the recommended operating range is 1.4V to 5.5V. Operation above 5.5V risks permanent damage and violates TI's Recommended Operating Conditions; sustained use beyond 5.5V voids warranty and may trigger internal overvoltage protection mechanisms not specified in the datasheet.

Does TLV77312PDQNR require an input capacitor?

TLV77312PDQNR does not require an input capacitor for stability, but TI strongly recommends a minimum 1µF ceramic capacitor from IN to GND. This capacitor mitigates source impedance effects, improves PSRR, and prevents ringing during load transients - especially critical when the device is located >1 inch from the power source or fed by high-impedance DC/DC outputs.

What is the purpose of the thermal pad on TLV77312PDQNR?

The thermal pad on TLV77312PDQNR is a mechanical and thermal interface - not an electrical terminal - and must be soldered to a GND plane using thermal vias. Doing so achieves RθJB = 180.8°C/W, enabling full 300mA output at +125°C ambient. Leaving it unconnected degrades thermal resistance by >30%, risking thermal shutdown under sustained load.

Can TLV77312PDQNR be used with output capacitance below 0.47µF?

No - TLV77312PDQNR requires a minimum effective output capacitance of 0.47µF for guaranteed stability, as confirmed in Section 5.3 Recommended Operating Conditions. Using less capacitance risks oscillation, poor transient response, and potential damage during load steps; the 0.47µF value accounts for derating due to voltage, temperature, and tolerance effects in ceramic capacitors.

How does the foldback current limit behave during a short circuit?

During a short circuit, TLV77312PDQNR transitions from brick-wall current limiting (350–720mA) to foldback mode when VOUT drops below VFOLDBACK, reducing output current to ~65mA (ISC). This lowers power dissipation in dropout, delaying thermal shutdown and allowing safe recovery once the fault clears - unlike pure brick-wall limiters that sustain high junction temperatures indefinitely.