Texas Instruments LP3882ES-1.2/NOPB

Overview

LP3882ES-1.2/NOPB from Texas Instruments is a 1.5A ultra-low-dropout linear regulator with CMOS N-MOS pass transistor architecture, delivering 1.2V output at ±1.5% accuracy over −40°C to +125°C, 110 mV typical dropout at 1.5A, and 60 nA shutdown current - designed for post-regulation in DSP, microcontroller core, and server I/O power supplies.

For engineers reviewing the LP3882ES-1.2/NOPB datasheet, LP3882ES-1.2/NOPB pinout, LP3882ES-1.2/NOPB application, or LP3882ES-1.2/NOPB equivalent, key selection criteria include bias-rail dependency (4.5–6V VBIAS), thermal design for DDPAK/TO-263 package (θJA ≈ 40°C/W on ≥1.5 in² copper), fast transient response, and mandatory 4.7 µF input/output capacitance with ESR-stable tantalum.

Technical Context

The LP3882ES-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 high bandwidth and low quiescent current across load. Its architecture eliminates base-drive losses inherent in PNP-based LDOs.

It integrates over-temperature and over-current protection, features a dedicated shutdown (S/D) pin with 0.7V turn-off threshold and 20 µs turn-off delay, and requires active pull-up (10–100 kΩ) on S/D for reliable control - unlike internally biased regulators.

Key Specifications

Pinout & Package

LP3882ES-1.2/NOPB is housed in a 5-pin DDPAK/TO-263 (KTT) thermally enhanced surface-mount package with exposed thermal pad soldered to PCB copper for θJA ≈ 40°C/W on ≥1.5 in² area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP3882ES-1.2/NOPB, TPS7A8300RGRT offers lower dropout without VBIAS complexity but sacrifices shutdown current (2.5 µA vs. 60 nA), while LT3080IMSE#PBF provides flexibility at the cost of accuracy, noise, and transient performance - making LP3882ES-1.2/NOPB optimal for precision, low-power, bias-rail-enabled designs.

Availability

LP3882ES-1.2/NOPB is available at Aetrix Electronics and suitable for DSP power supplies, microcontroller core voltage regulation, and server I/O supplies requiring stable component supply, long-term lifecycle support, and RoHS-exempt compliance for high-reliability deployments.

Supply support for LP3882ES-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 regulation and thermal-aware packaging.

The LP3882 product line was engineered for high-current, ultra-low-dropout applications demanding fast transient response and bias-rail efficiency - targeting DSP, microcontroller, and server power subsystems where traditional PNP LDOs fall short.

FAQ

What is the minimum input voltage required for LP3882ES-1.2/NOPB to regulate 1.2V at 1.5A?

The LP3882ES-1.2/NOPB requires VIN ≥ (VOUT + VDO) = 1.2V + 0.11V = 1.31V under typical conditions. Absolute maximum dropout is 170 mV per datasheet, so worst-case minimum VIN is 1.37V. This assumes VBIAS is within 4.5–6V and ambient temperature is within −40°C to +125°C operating range. The LP3882ES-1.2/NOPB cannot regulate if VIN falls below this differential.

Can LP3882ES-1.2/NOPB operate without an external VBIAS supply?

No - LP3882ES-1.2/NOPB requires an external 4.5–6V VBIAS rail to drive the gate of its N-MOS pass transistor. Without VBIAS, the device will not enable output, even if VIN is sufficient. The VBIAS pin must be decoupled with a 0.1 µF capacitor and monitored by internal UVLO that prevents startup below ~4V. LP3882ES-1.2/NOPB has no internal charge pump or bootstrap circuitry to generate gate drive.

What output capacitor types are compatible with LP3882ES-1.2/NOPB?

LP3882ES-1.2/NOPB requires ≥4.7 µF output capacitance with ESR between 0.001 Ω and 1 Ω across temperature. Tantalum capacitors are explicitly recommended due to stable ESR over −40°C to +125°C. Aluminum electrolytics are discouraged below 10°C. Ceramic capacitors alone are incompatible - their sub-10 mΩ ESR causes instability. Up to 15% ceramic capacitance may be added in parallel with tantalum, but direct ceramic-only use violates stability requirements for LP3882ES-1.2/NOPB.

How is thermal performance managed in the DDPAK/TO-263 package of LP3882ES-1.2/NOPB?

The LP3882ES-1.2/NOPB in DDPAK/TO-263 (KTT) achieves θJA ≈ 40°C/W when soldered to ≥1.5 in² of 1-oz copper on the PCB - acting as its primary heatsink. No external heatsink is needed below ~1W dissipation at +85°C ambient. Thermal shutdown engages above +150°C junction temperature and recovers autonomously. Layout must maximize copper area under the exposed thermal pad and use multiple vias to inner ground planes. LP3882ES-1.2/NOPB's thermal design eliminates reliance on case-to-heatsink interfaces.

Does LP3882ES-1.2/NOPB support sequencing with other power rails?

Yes - LP3882ES-1.2/NOPB supports controlled power sequencing via its active-low S/D pin, which turns off output within 20 µs and draws only 60 nA in shutdown. To sequence with other rails, tie S/D to a system supervisor or sequencer output with 10–100 kΩ pull-up to VBIAS. The 0.7V turn-off threshold and 1.3V turn-on threshold provide noise margin. LP3882ES-1.2/NOPB does not offer built-in tracking or soft-start, so external RC networks may be added to S/D for delayed enable.