Texas Instruments LP3881ESX-1.2/NOPB

Overview

LP3881ESX-1.2/NOPB from Texas Instruments is a 0.8A ultra-low-dropout linear regulator with 1.2V fixed output, fabricated on CMOS process using an N-MOS pass transistor. It features 75 mV typical dropout at 0.8A, 1.5% output voltage accuracy at 25°C, and operates from dual supplies (VIN and VBIAS). It delivers stable core power for DSPs and microcontrollers in space-constrained industrial and embedded systems.

For engineers reviewing the LP3881ESX-1.2/NOPB datasheet, LP3881ESX-1.2/NOPB pinout, LP3881ESX-1.2/NOPB application, or LP3881ESX-1.2/NOPB equivalent, key selection criteria include dropout performance at full load, bias rail dependency (4.5–6V), thermal derating in TO-263 package, and compatibility with ≥4.7 µF tantalum output capacitance.

Technical Context

The LP3881ESX-1.2/NOPB employs a CMOS-based architecture with external VBIAS supply to drive the N-MOS pass transistor gate, enabling operation with VIN as low as VOUT + VDO while maintaining fast transient response. Its control loop requires minimal external capacitance (≥4.7 µF) and is optimized for stability with tantalum output capacitors having ESR within specified bounds.

It integrates over-temperature and over-current protection, supports shutdown via S/D pin with 60 nA typical quiescent current, and maintains ±1.5% output accuracy across −40°C to +125°C junction temperature range. The device's ground current remains low (3 mA typ at full load) and independent of output load due to CMOS design.

Key Specifications

Pinout & Package

LP3881ESX-1.2/NOPB is packaged in DDPAK/TO-263 (KTT), a 5-pin surface-mount package with exposed thermal pad for enhanced heat dissipation. The package supports θ_JA ≈ 40°C/W when soldered to ≥1.5 in² copper plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-dropout linear regulator applications.

Compared with TPS7A4700RGWR and MCP1826T-1202E/DB, LP3881ESX-1.2/NOPB uniquely balances 0.8 A output, 75 mV dropout, and VBIAS-enabled ultra-low-VIN operation in a thermally robust TO-263 package-making it optimal for high-current, space-constrained, and battery-derived systems.

Availability

LP3881ESX-1.2/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, telecom baseband boards, battery-powered sensor nodes, and set-top box SoC power domains requiring stable component supply with long-term manufacturability.

Supply support for LP3881ESX-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 LP3881 series was designed specifically for high-current, fast-transient, ultra-low-dropout applications in DSP, microcontroller, and SMPS post-regulation systems-emphasizing thermal robustness, precision, and bias-rail flexibility.

FAQ

What is the minimum input voltage required for LP3881ESX-1.2/NOPB to regulate at full 0.8 A load?

The minimum input voltage is determined by dropout: V_IN(MIN) = V_OUT + V_DO. For LP3881ESX-1.2/NOPB, V_DO is 75 mV typical at 0.8 A, so V_IN(MIN) = 1.2 V + 0.075 V = 1.275 V. However, VBIAS must also be supplied at 4.5–6 V, and VIN must meet the operating condition (VOUT + VDO) to 5.5 V per datasheet.

Can LP3881ESX-1.2/NOPB operate without an external VBIAS supply?

No. LP3881ESX-1.2/NOPB requires an external VBIAS supply between 4.5 V and 6 V applied to Pin 4. This rail powers the gate driver for the N-MOS pass transistor. If VBIAS is missing or below ~4 V, the part enters undervoltage lockout and disables output regulation-even if VIN is valid.

What output capacitor types are compatible with LP3881ESX-1.2/NOPB?

Tantalum capacitors ≥4.7 µF are recommended for LP3881ESX-1.2/NOPB due to their stable ESR across temperature. Aluminum electrolytics are discouraged below 10°C. Ceramic capacitors alone are incompatible (ESR too low), but up to 15% of the tantalum capacitance value may be added as ceramic bypass near the load-not at the regulator output pin.

How does the thermal performance of LP3881ESX-1.2/NOPB compare across packages?

LP3881ESX-1.2/NOPB uses the TO-263 (KTT) package, which achieves θ_JA ≈ 40°C/W when soldered to ≥1.5 in² copper. This is significantly better than SOIC-8 (θ_JA ≈ 166°C/W) and comparable to TO-220 with heatsink. The exposed thermal pad must be soldered to PCB copper for rated performance.

Is LP3881ESX-1.2/NOPB RoHS compliant?

Yes. LP3881ESX-1.2/NOPB carries "RoHS Exempt" status per TI's packaging documentation, indicating compliance with EU RoHS Directive 2011/65/EU with applicable exemptions (e.g., lead in high-melting-temperature solder). Full compliance documentation is available in TI's official RoHS statement.