Texas Instruments LP3879SD-1.0/NOPB

Overview

LP3879SD-1.0/NOPB from Texas Instruments is a micropower, low-noise, fixed-output 1.0 V linear voltage regulator delivering up to 800 mA with ±1% initial output accuracy, 18 µV_RMS broadband noise (100 Hz–100 kHz), and operation from 2.5 V to 6 V input. It employs a vertically integrated PNP (VIP) process, supports ceramic output capacitors down to 10 µF, and integrates remote sense for improved load regulation in FPGA, ASIC, and medical instrumentation power rails.

For engineers reviewing the LP3879SD-1.0/NOPB datasheet, LP3879SD-1.0/NOPB pinout, LP3879SD-1.0/NOPB application, or LP3879SD-1.0/NOPB equivalent, this page delivers verified package mapping (WSON-8 NGT), validated pin functions, confirmed thermal performance (θ_J−A ≈ 40°C/W), real-world stability requirements (10 nF bypass + 10 µF ceramic output), and direct alternative options for low-voltage, low-noise LDO selection.

Technical Context

The LP3879SD-1.0/NOPB uses a VIP-based PNP pass transistor architecture enabling ultra-low ground pin current (5.5 mA at 800 mA load; 200 µA at 100 µA load) and high peak current capability (1200 mA). Its internal bandgap reference feeds a precision error amplifier that drives the pass element via a low-impedance path optimized for ceramic capacitor stability.

Remote sense (SENSE pin) enables accurate regulation at the point of load by compensating for PCB trace IR drop, while the dedicated BYPASS pin connects to a 10 nF capacitor to suppress reference noise and ensure loop stability-critical for sub-1.2 V digital core supplies where noise margin is constrained.

Key Specifications

Pinout & Package

The LP3879SD-1.0/NOPB is housed in an 8-pin WSON (NGT0008A) package with an exposed thermal pad on the bottom surface, requiring solder connection to a PCB ground plane for thermal and mechanical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL7407LPGQDR and TPS7A2010PDQNR, the LP3879SD-1.0/NOPB uniquely combines 800 mA delivery, remote sense, dedicated noise-bypass architecture, and ceramic stability-making it irreplaceable for high-current, precision 1.0 V digital power where load regulation and noise immunity are co-critical.

Availability

LP3879SD-1.0/NOPB is available at Aetrix Electronics and suitable for FPGA core supplies, medical AFE rails, and SMPS post-regulation requiring stable component supply across industrial temperature ranges (-40°C to +125°C) and long-lifecycle production programs.

Supply support for LP3879SD-1.0/NOPB 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 expertise in high-reliability, thermally robust power solutions.

The LP3879SD-1.0/NOPB belongs to TI's micropower LDO family engineered for low-voltage digital systems-designed to deliver precision, low noise, and ceramic capacitor compatibility in space-constrained, thermally demanding applications.

FAQ

What is the maximum continuous output current of the LP3879SD-1.0/NOPB?

The LP3879SD-1.0/NOPB delivers up to 800 mA continuously under specified thermal conditions (θ_J−A ≈ 40°C/W on a 4-layer PCB with thermal vias). Its peak current capability reaches 1200 mA for short-duration transients, supporting burst-mode digital loads without dropout. Derating is required above ambient temperatures where junction temperature exceeds 125°C.

Does the LP3879SD-1.0/NOPB require an external bypass capacitor, and why?

Yes-the LP3879SD-1.0/NOPB requires a 10 nF capacitor between the BYPASS pin and ground. This capacitor directly filters the internal bandgap reference, reducing output noise to 18 µV_RMS and ensuring loop stability. Ceramic or film types with ≤100 nA DC leakage must be used; excessive leakage degrades output voltage accuracy.

Can the LP3879SD-1.0/NOPB be used without connecting the SENSE pin?

Yes-the SENSE pin may be tied directly to the OUTPUT pin for standard regulation. However, leaving it unconnected is not allowed. When tied to OUTPUT, the LP3879SD-1.0/NOPB provides standard load regulation; remote connection to the load improves regulation accuracy by compensating for PCB trace resistance, especially critical at 800 mA.

What package type and thermal considerations apply to the LP3879SD-1.0/NOPB?

The LP3879SD-1.0/NOPB uses the 8-pin WSON (NGT0008A) package with an exposed thermal pad. This pad must be soldered to a PCB copper area connected to ground for effective heat dissipation. With proper layout (4-layer board, thermal vias), θ_J−A is ~40°C/W-enabling 1.2 W dissipation before thermal shutdown at 25°C ambient.

Is the LP3879SD-1.0/NOPB compatible with ceramic output capacitors, and what are the requirements?

Yes-the LP3879SD-1.0/NOPB is specifically designed for ceramic output capacitors. It requires ≥10 µF X5R or X7R dielectric, with ESR ≤25 mΩ in the 50–200 kHz range. Capacitor tolerance and temperature drift must ensure minimum capacitance is maintained across -40°C to +125°C; Z5U/Y5V types are prohibited due to severe voltage and temperature derating.