Texas Instruments LP2985-30DBVRG4

Overview

LP2985-30DBVRG4 from Texas Instruments is a fixed 3.0V, 150mA low-dropout linear regulator in SOT-23-5 (DBV) package, featuring ±0.5% output accuracy (new chip), 30µV_RMS output noise with 10nF bypass capacitor, 70dB PSRR at 1kHz, and shutdown current of 1.12µA. It powers noise-sensitive analog circuitry in battery-powered industrial control modules.

For engineers reviewing the LP2985-30DBVRG4 datasheet, LP2985-30DBVRG4 pinout, LP2985-30DBVRG4 application, or LP2985-30DBVRG4 equivalent, key selection criteria include dropout voltage at 150mA (180–198mV), stability with 2.2µF ceramic output capacitors, thermal shutdown threshold (170°C), and ON/OFF pin logic thresholds (0.15V low / 1.6V high).

Technical Context

The LP2985-30DBVRG4 uses a CMOS pass transistor architecture with internal bandgap reference and error amplifier, enabling ultra-low dropout and high PSRR across 1kHz–1MHz. Its integrated soft-start reduces inrush current during enable transitions, minimizing input capacitance requirements.

It implements active-high enable logic with internal pulldown on disable, supports UVLO (2.2–2.4V rising threshold), and delivers ±1% total output accuracy over –40°C to +125°C junction temperature and full 0–150mA load range - critical for powering 3.3V microcontrollers and RF front-end bias rails.

Key Specifications

Pinout & Package

LP2985-30DBVRG4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.9mm × 2.8mm, optimized for space-constrained PCB layouts and thermal performance (R_θJA = 178.6°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSS721AIDBVR and MCP1700T-3002E/MB, LP2985-30DBVRG4 uniquely combines 3.0V precision (±0.5%), 30µV_RMS noise via BYPASS pin, and 70dB PSRR - making it the only choice for RF bias and high-resolution data acquisition where spectral purity is non-negotiable.

Availability

LP2985-30DBVRG4 is available at Aetrix Electronics and suitable for industrial motor drives, wireless infrastructure mMIMO systems, and portable test equipment requiring stable component supply and long-term production continuity.

Supply support for LP2985-30DBVRG4 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, designing and manufacturing analog and embedded processing solutions for industrial, automotive, and communications markets.

The LP2985 product line delivers cost-effective, low-noise LDO regulators targeting portable and industrial applications where precision voltage regulation, low quiescent current, and high PSRR are essential - especially in noise-sensitive analog and RF subsystems.

FAQ

What is the output voltage tolerance of LP2985-30DBVRG4 across temperature and load?

LP2985-30DBVRG4 guarantees ±0.5% output voltage accuracy at room temperature and ±1% over the full –40°C to +125°C junction temperature range and 0–150mA load current. This specification applies specifically to the "new chip" revision referenced in the SLVS522S datasheet revision May 2025.

Can LP2985-30DBVRG4 operate with a 2.2µF ceramic output capacitor?

Yes - LP2985-30DBVRG4 is explicitly characterized and guaranteed stable with a minimum 2.2µF ceramic output capacitor (X7R/X5R, ESR ≤1Ω). This eliminates reliance on larger, less reliable tantalum or aluminum electrolytic capacitors in space-constrained designs.

What is the purpose of the BYPASS pin on LP2985-30DBVRG4?

The BYPASS pin on LP2985-30DBVRG4 connects to a 10nF capacitor to ground, filtering the internal bandgap reference voltage and reducing output noise to 30µV_RMS. Omitting this capacitor degrades noise performance significantly and is not recommended for analog or RF applications.

Does LP2985-30DBVRG4 include thermal protection?

Yes - LP2985-30DBVRG4 incorporates thermal shutdown with a trip threshold of 170°C (rising) and reset at 150°C (falling). This protects the device during sustained overload or poor PCB thermal design while allowing automatic recovery once temperature decreases.

What are the ON/OFF pin voltage thresholds for LP2985-30DBVRG4?

For LP2985-30DBVRG4, the ON/OFF pin asserts high-enable at ≥1.6V and low-disable at ≤0.15V (over –40°C to +125°C). Unlike legacy versions, no minimum slew rate is required on the enable signal, simplifying GPIO-driven control.