Texas Instruments TLV77133PDQNR

Overview

TLV77133PDQNR from Texas Instruments is a 150mA, fixed 3.3V output, low-dropout linear regulator in a 1mm × 1mm X2SON-4 package. It delivers high PSRR (55dB at 1MHz), operates from 1.4V to 5.5V input, achieves ±2% output accuracy, and maintains 113mV dropout at full load - enabling stable power for noise-sensitive analog and RF circuitry in space-constrained portable electronics.

For engineers reviewing the TLV77133PDQNR datasheet, TLV77133PDQNR pinout, TLV77133PDQNR application, or TLV77133PDQNR equivalent, key selection criteria include its active output pulldown, foldback current limiting, thermal shutdown behavior, and compatibility with 0.47µF–40µF ceramic output capacitors without external compensation.

Technical Context

The TLV77133PDQNR uses a CMOS pass transistor architecture with internal soft-start and an active discharge MOSFET tied to the EN pin. Its feedback loop is optimized for stability with minimal 1µF input and 0.47µF output ceramic capacitors, eliminating need for ESR tuning.

It implements hybrid brick-wall/foldback current limiting: sustaining 200–460mA current limit above VFOLDBACK (~1.8V), then scaling down to ~42mA short-circuit current as VOUT collapses - preventing thermal runaway during sustained overload while enabling safe recovery after fault clearance.

Key Specifications

Pinout & Package

TLV77133PDQNR is housed in a 1mm × 1mm, 4-pin X2SON (DQN) package with exposed thermal pad. The compact footprint supports high-density PCB layouts in smartphones and wearables, and the thermal pad must be connected to GND for optimal junction-to-board thermal resistance (180.8°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV77133PDQNR, TPL7407LPGQ serves drive-oriented functions rather than regulation, while MCP1700T-3302E/MB trades higher dropout and weaker 1MHz PSRR for broader availability - making TLV77133PDQNR the preferred choice for space-constrained, noise-sensitive 3.3V rail generation.

Availability

TLV77133PDQNR is available at Aetrix Electronics and suitable for smartphone power management, camera module biasing, gaming controller MCU supplies, streaming media player audio codecs, and set-top box SoC I/O rails requiring stable component supply across high-volume production cycles.

Supply support for TLV77133PDQNR 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 connectivity technologies, with decades of LDO design expertise and broad automotive, industrial, and consumer qualification coverage.

The TLV771 family was engineered for ultra-compact, high-PSRR power delivery in portable electronics - targeting applications where board space, noise immunity, and fast enable/disable response are critical constraints.

FAQ

What is the maximum output current capability of the TLV77133PDQNR?

The TLV77133PDQNR is rated for continuous 150mA output current under recommended operating conditions (TJ ≤ 125°C). Its foldback current limit activates at 200–460mA depending on output voltage, and short-circuit current is typically 42mA - providing robust overload protection without external components. Derating is required above 85°C ambient due to thermal limits.

Does the TLV77133PDQNR require external capacitors for stability?

Yes, the TLV77133PDQNR requires a minimum 0.47µF ceramic output capacitor (X7R/X5R dielectric) and recommends a 1µF input capacitor for optimal transient response and PSRR. It is explicitly designed to be stable with these small, low-ESR ceramics - no series resistance or tantalum capacitors are needed, simplifying layout and reducing bill-of-materials cost.

How does the active pulldown feature operate in the TLV77133PDQNR?

The TLV77133PDQNR integrates a 135Ω MOSFET pulldown between OUT and GND that activates automatically when the EN pin falls below 0.3V or when input voltage drops below UVLO. This discharges output capacitance rapidly - ensuring VOUT falls to <100mV within microseconds - which prevents floating states that could cause latch-up or false wake-up in downstream logic powered by the same rail.

What is the dropout voltage specification for TLV77133PDQNR at full load?

The TLV77133PDQNR has a maximum dropout voltage of 113mV at 150mA output current and 3.3V nominal output, measured at TJ = –40°C to +85°C. At worst-case temperature, dropout rises to 140mV - meaning the device maintains regulation as long as input voltage stays ≥3.44V (3.3V + 0.14V), supporting operation down to near-end-of-life battery voltages in portable systems.

Can TLV77133PDQNR be used with a 1.8V logic enable signal?

Yes, TLV77133PDQNR is fully compatible with 1.8V GPIO enable signals: its VEN(HI) threshold is guaranteed ≥0.9V and VEN(LOW) ≤0.3V across –40°C to +85°C, providing >0.9V noise margin for 1.8V logic. No level-shifting circuitry is required, simplifying integration with modern low-voltage microcontrollers and application processors.