Texas Instruments LP3883ESX-1.2/NOPB

Overview

LP3883ESX-1.2/NOPB from Texas Instruments is a 3A ultra-low-dropout linear regulator with CMOS N-MOS pass transistor architecture, delivering 1.2V fixed output at ±1.5% accuracy over −40°C to +125°C, 210 mV typical dropout at 3A, and 60 nA shutdown current - designed for DSP core supplies, microprocessor post-regulation, and high-efficiency linear power stages.

For engineers reviewing the LP3883ESX-1.2/NOPB datasheet, LP3883ESX-1.2/NOPB pinout, LP3883ESX-1.2/NOPB application, or LP3883ESX-1.2/NOPB equivalent, key selection criteria include bias-rail dependency (4.5–6V VBIAS), DDPAK/TO-263 thermal performance (θJA ≈ 40°C/W with ≥1.5 in² copper), and strict output capacitor ESR constraints for stability.

Technical Context

The LP3883ESX-1.2/NOPB uses an external VBIAS rail to drive the gate of its N-MOS pass transistor, enabling operation with VIN as low as VOUT + VDO while maintaining fast transient response and minimal quiescent current across load range. Its CMOS control circuitry draws only 7 mA from VIN and 2 mA from VBIAS at full 3A load.

Stability requires ≥4.7 µF output capacitance with ESR between 0.001 Ω and 1 Ω over temperature; tantalum capacitors are recommended due to stable ESR, whereas ceramic-only outputs are prohibited. Shutdown is controlled via active-low S/D pin with 1 µA input current and 20 µs turn-off delay.

Key Specifications

Pinout & Package

LP3883ESX-1.2/NOPB is housed in a thermally enhanced DDPAK/TO-263 (KTT) package with 5 terminals, featuring an exposed thermal pad soldered to PCB copper for effective heat dissipation (θJA ≈ 40°C/W with ≥1.5 in² 1-oz copper).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP3883ESX-1.2/NOPB, TPS7A8300RGRT eliminates VBIAS complexity but increases BOM count and cost, while LT3080IM#PBF offers flexibility at the expense of precision, noise, and dropout - making LP3883ESX-1.2/NOPB optimal for fixed 1.2V, bias-rail-enabled, low-noise industrial designs.

Availability

LP3883ESX-1.2/NOPB is available at Aetrix Electronics and suitable for DSP power supplies, server I/O regulation, and set-top box SoC applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-exempt manufacturing compliance.

Supply support for LP3883ESX-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 power management ICs, with decades of expertise in high-reliability linear regulators and power solutions.

The LP3883 product line was engineered for high-current, low-noise, fast-transient applications in digital signal processing, microprocessor core regulation, and SMPS post-regulation - emphasizing ultra-low dropout, bias-rail efficiency, and thermal robustness in TO-263 packaging.

FAQ

What is the minimum input voltage required for LP3883ESX-1.2/NOPB to regulate 1.2V at 3A?

The LP3883ESX-1.2/NOPB requires VIN ≥ VOUT + VDO = 1.2 V + 0.21 V = 1.41 V (typical) to maintain regulation at 3A. The absolute minimum is defined by the 270 mV max dropout in electrical characteristics, so VIN ≥ 1.47 V ensures guaranteed operation across temperature and process variation. Always verify VBIAS is present and within 4.5–6 V.

Can LP3883ESX-1.2/NOPB operate without an external VBIAS supply?

No - LP3883ESX-1.2/NOPB requires an external 4.5–6 V VBIAS rail to drive the gate of its N-MOS pass transistor. It cannot bootstrap or derive VBIAS internally. Omitting VBIAS prevents output regulation entirely, regardless of VIN level. The VBIAS pin must be decoupled with a 0.1 µF ceramic capacitor.

What output capacitor types are compatible with LP3883ESX-1.2/NOPB?

Tantalum capacitors are strongly recommended for LP3883ESX-1.2/NOPB due to their stable, low-temperature ESR (0.001–1 Ω range). Aluminum electrolytics are discouraged below 10°C, and ceramic-only outputs are prohibited - though up to 15% ceramic capacitance may be added in parallel with tantalum. Minimum COUT is 4.7 µF.

Does LP3883ESX-1.2/NOPB include thermal shutdown protection?

Yes - LP3883ESX-1.2/NOPB integrates over-temperature protection that disables the output when junction temperature exceeds safe limits. This feature activates before permanent damage occurs and automatically recovers once temperature falls below the hysteresis threshold. Thermal shutdown works independently of VBIAS and shutdown pin state.

What is the purpose of the S/D pin on LP3883ESX-1.2/NOPB, and how should it be interfaced?

LP3883ESX-1.2/NOPB's S/D pin is an active-low shutdown control. Pulling it below 0.3 V turns off the regulator (60 nA IQ); tying it to VBIAS enables operation. A 10–100 kΩ pull-up resistor to VBIAS is mandatory unless driven by a rail-to-rail CMOS output. Do not leave S/D floating - unintended shutdown or oscillation may occur.