Texas Instruments LP3879SDX-1.2/NOPB

Overview

LP3879SDX-1.2/NOPB from Texas Instruments is a micropower, low-noise, fixed-output 1.2 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 uses a VIP PNP pass element, supports ceramic output capacitors down to 10 µF, and targets FPGA, ASIC, and DSP core power in notebooks and medical instrumentation.

For engineers reviewing the LP3879SDX-1.2/NOPB datasheet, LP3879SDX-1.2/NOPB pinout, LP3879SDX-1.2/NOPB application, or LP3879SDX-1.2/NOPB equivalent, this page delivers verified specifications, WSON-8 package layout, remote sense capability, shutdown control interface, and real-world design constraints including ESR-stable ceramic capacitor requirements and reverse-input protection guidance.

Technical Context

The LP3879SDX-1.2/NOPB employs a vertically integrated PNP (VIP) pass transistor architecture enabling ultra-low ground pin current (5.5 mA at 800 mA load) and high peak current capability (1200 mA). Its internal error amplifier references a stable bandgap and uses the SENSE pin for remote voltage regulation, improving load regulation by compensating PCB trace resistance.

Stability is achieved via a dedicated BYPASS pin requiring a 10 nF low-leakage capacitor (≤100 nA DC) to suppress reference noise and ensure loop phase margin; the regulator is explicitly designed for ultra-low-ESR ceramic output capacitors (5–25 mΩ range across 0–800 mA), unlike traditional LDOs requiring tantalum or higher-ESR ceramics.

Key Specifications

Pinout & Package

LP3879SDX-1.2/NOPB is packaged in an 8-pin WSON (NGT0008A) surface-mount package with an exposed thermal pad on the bottom, requiring solder connection to a PCB ground plane for thermal and mechanical reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSS721AIDR and TPS7A2012PDBVR, LP3879SDX-1.2/NOPB uniquely combines 800 mA delivery, 18 µV_RMS noise, remote sense, and ceramic-stable design in a thermally enhanced WSON-8-making it the only option for high-current, precision, low-noise applications demanding full feature parity.

Availability

LP3879SDX-1.2/NOPB is available at Aetrix Electronics and suitable for FPGA power supplies, medical instrumentation, and SMPS post-regulation requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant packaging.

Supply support for LP3879SDX-1.2/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 high-reliability power management solutions.

The LP3879 series was engineered for low-voltage, low-noise core and I/O regulation in portable and high-precision electronics-emphasizing ceramic capacitor compatibility, micropower operation, and robust thermal performance in compact packages.

FAQ

What is the maximum input voltage the LP3879SDX-1.2/NOPB can withstand?

The LP3879SDX-1.2/NOPB has an absolute maximum input survival voltage of +16 V, but its normal operating input range is strictly 2.5 V to 6.0 V. Exceeding 6.0 V during operation risks violating safe operating area limits and may trigger internal protection or cause permanent damage. Always maintain VIN within the specified 2.5–6 V window for reliable LP3879SDX-1.2/NOPB performance.

Does the LP3879SDX-1.2/NOPB require an external BYPASS capacitor, and why?

Yes-the LP3879SDX-1.2/NOPB mandates a 10 nF low-leakage capacitor (≤100 nA DC) between BYPASS (Pin 1) and GROUND. This capacitor reduces bandgap reference noise and ensures loop stability; omitting it degrades output noise performance and risks oscillation. The LP3879SDX-1.2/NOPB datasheet explicitly states this capacitor is required-not optional-for functional reliability.

Can the LP3879SDX-1.2/NOPB be used without connecting the SENSE pin?

Yes-the SENSE pin (Pin 5) may be tied directly to OUTPUT (Pin 6) for local regulation, or left unconnected only if the application tolerates degraded load regulation (±0.5% typical vs. ±0.1% with remote sense). However, the LP3879SDX-1.2/NOPB achieves its best accuracy and line/load regulation specs only when SENSE is properly routed to the load point-so omitting remote sense forfeits a key LP3879SDX-1.2/NOPB capability.

What is the thermal pad connection requirement for the LP3879SDX-1.2/NOPB WSON package?

The exposed thermal pad on the LP3879SDX-1.2/NOPB WSON package must be soldered to a PCB copper area connected to GROUND. This connection is mandatory for thermal dissipation (θ_J−A ≈ 40°C/W with proper layout) and mechanical reliability. TI's NGT0008A package drawing specifies solder coverage ≥77% of the pad area; failure to connect the pad risks thermal shutdown or premature failure under sustained 800 mA loads.

Is the LP3879SDX-1.2/NOPB compatible with standard 10 µF ceramic capacitors?

Yes-but only X5R or X7R dielectric types rated for ≥10 µF (±20%) across −40°C to +125°C. Z5U and Y5V ceramics are prohibited due to severe capacitance loss (>50%) with temperature and voltage bias. The LP3879SDX-1.2/NOPB requires stable ESR (5–25 mΩ) for loop stability; X5R/X7R ceramics meet this, while low-cost alternatives do not. Always verify capacitor specs per LP3879SDX-1.2/NOPB application guidelines.