Texas Instruments LP590729QDQNRQ1

Overview

LP590729QDQNRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified low-dropout linear regulator delivering 250 mA output current with fixed 2.9 V output, ultra-low 6.5 µV_RMS output noise, 82 dB PSRR at 1 kHz, and 12 µA quiescent current - designed for powering noise-sensitive RF and analog circuits in ADAS camera modules.

For engineers reviewing the LP590729QDQNRQ1 datasheet, LP590729QDQNRQ1 pinout, LP590729QDQNRQ1 application, or LP590729QDQNRQ1 equivalent, key selection criteria include its 1.0 mm × 1.0 mm X2SON-4 package, remote capacitor placement capability (up to 10 cm), no-bypass-capacitor operation, thermal shutdown at 160°C, and ±2% output voltage tolerance across –40°C to 125°C junction temperature.

Technical Context

The LP590729QDQNRQ1 implements a high-PSRR, low-noise LDO architecture with internal RC filtering (–3 dB at ~0.1 Hz) to suppress reference noise, enabling stable 2.9 V regulation without external noise bypass capacitors. Its enable logic includes a 1-MΩ internal pulldown and VIH/VIL thresholds of 1.2 V/0.4 V.

It supports remote output capacitor placement up to 10 cm from the package while maintaining stability with only 1-µF ceramic input and output capacitance, and integrates thermal shutdown (160°C trip, 145°C hysteresis) and short-circuit current limiting (250–500 mA).

Key Specifications

Pinout & Package

LP590729QDQNRQ1 is housed in a 4-pin X2SON package (1.00 mm × 1.00 mm, 0.4 mm height), optimized for space-constrained automotive modules. The package has no exposed thermal pad and uses bottom-side solder terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP590729QDQNRQ1, TNIV590729QDQNRQ1 offers identical performance and drop-in compatibility, while LP5907285QDQNRQ1 provides a 50 mV lower output for tighter-voltage-margin applications - neither replaces LP590729QDQNRQ1 without verifying load voltage compliance.

Availability

LP590729QDQNRQ1 is available at Aetrix Electronics and suitable for ADAS camera modules, automotive infotainment subsystems, and telematics control units requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for LP590729QDQNRQ1 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and automotive-grade ICs with broad manufacturing scale and automotive qualification infrastructure.

The LP5907-Q1 product line was developed specifically for automotive RF and analog power integrity - targeting noise-sensitive domains like ADAS cameras, radar receivers, and infotainment audio where ultra-low noise, small footprint, and AEC-Q100 reliability are mandatory.

FAQ

What is the output voltage tolerance of the LP590729QDQNRQ1 over temperature and load?

The LP590729QDQNRQ1 maintains ±2% output voltage tolerance across the full AEC-Q100 Grade 1 temperature range (–40°C to +125°C junction) and full load range (0–250 mA), as specified in the Electrical Characteristics table for the X2SON-4 package with VOUT ≤ 2.5 V - and this applies directly to the 2.9 V variant per TI's characterization data and device family documentation.

Does the LP590729QDQNRQ1 require an external noise-bypass capacitor?

No, the LP590729QDQNRQ1 does not require an external noise-bypass capacitor. Its internal RC filter (–3 dB at ~0.1 Hz) suppresses reference voltage noise, enabling ultra-low 6.5 µV_RMS output noise with only 1-µF input and output ceramic capacitors - a key design feature confirmed in the Functional Block Diagram and Feature Description sections of the official datasheet.

What is the maximum recommended distance for remote placement of the output capacitor with the LP590729QDQNRQ1?

The LP590729QDQNRQ1 supports remote output capacitor placement up to 10 cm from the device package while maintaining stability, as explicitly stated in Section 7.3.5 ("Remote Output Capacitor Placement") and validated in typical application layouts - provided the 1-µF ceramic capacitor meets ESR specifications (5–500 mΩ) and uses appropriate PCB routing practices.

How does the enable pin (EN) function on the LP590729QDQNRQ1?

The EN pin on the LP590729QDQNRQ1 is active-high with internal 1-MΩ pulldown to GND. It enables regulation when driven above 1.2 V (VIH) and disables output with automatic 230-Ω pulldown discharge when pulled below 0.4 V (VIL). This behavior is confirmed in Pin Functions, Section 7.3.2, and Figure 2 of the datasheet.

Is the LP590729QDQNRQ1 thermally protected, and what is its shutdown threshold?

Yes, the LP590729QDQNRQ1 includes integrated thermal shutdown protection that triggers at approximately 160°C junction temperature (TSD), with ~15°C hysteresis (re-enable at ~145°C). This is documented in Section 6.5 (Electrical Characteristics), Section 7.3.6, and the Absolute Maximum Ratings table - ensuring safe operation under overload or poor heatsinking conditions.