Texas Instruments LP3982ILD-3.0

Overview

LP3982ILD-3.0 from Texas Instruments (formerly National Semiconductor) is a fixed-output 3.0V, 300mA micropower ultra low-dropout CMOS linear regulator in an 8-pin LLP package. It delivers stable output with 120mV typical dropout at full load, 90µA typical quiescent current, and 37µV_RMS output noise (10Hz–100kHz), making it ideal for battery-powered DSP core power and portable information appliances.

For engineers reviewing the LP3982ILD-3.0 datasheet, LP3982ILD-3.0 pinout, LP3982ILD-3.0 application, or LP3982ILD-3.0 equivalent, key selection criteria include its 2.5V–6.0V input range, 1nA shutdown current, ±2% output voltage tolerance, FAULT pin for regulation fault detection, and stability with 2.2µF ceramic output capacitors.

Technical Context

The LP3982ILD-3.0 employs a PMOS pass transistor architecture enabling ultra-low dropout and near-zero drive current consumption-unlike PNP-based LDOs. Its internal bandgap reference, error amplifier, and compensation network support fast 120µs turn-on time and no-load stability critical for RAM keep-alive circuits.

Regulation fault detection is implemented via an open-drain FAULT pin that asserts low during thermal shutdown, current limit, or input-to-output differential approaching dropout. The SHDN pin enables logic-controlled sleep mode with 1nA typical supply current, while the noise bypass capacitor (33nF on pin 6) reduces output noise without degrading transient response.

Key Specifications

Pinout & Package

LP3982ILD-3.0 is housed in an 8-pin LLP (Leadless Leadframe Package), measuring 3.0mm × 3.0mm × 0.8mm, with exposed thermal pad for enhanced power dissipation. This thermally efficient surface-mount package supports high-density PCB layouts in space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC7703CP and TPS73030DBVR, LP3982ILD-3.0 uniquely combines ultra-low dropout (120mV), integrated fault reporting, and configurable noise reduction-making it optimal for battery-critical, safety-monitored portable electronics where both efficiency and reliability are non-negotiable.

Availability

LP3982ILD-3.0 is available at Aetrix Electronics and suitable for wireless handset power management, DSP core supply, and portable information appliance applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LP3982ILD-3.0 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 acquired National Semiconductor in 2011 and maintains its legacy analog portfolio, including precision power management ICs engineered for high reliability and low-power operation.

The LP3982ILD-3.0 belongs to TI's micropower LDO family designed specifically for battery-powered portable electronics-emphasizing ultra-low IQ, low noise, and robust fault handling in compact LLP packages.

FAQ

What is the maximum input voltage rating for LP3982ILD-3.0?

The absolute maximum input voltage for LP3982ILD-3.0 is 6.5V, but the recommended operating range is 2.5V to 6.0V. Exceeding 6.5V risks permanent damage per Absolute Maximum Ratings. Operation within 2.5V–6.0V ensures guaranteed performance across −40°C to +85°C ambient temperature, including specified dropout, noise, and regulation accuracy. LP3982ILD-3.0 must never be subjected to reverse polarity or voltage transients beyond these limits.

Does LP3982ILD-3.0 require an external capacitor on the CC pin?

Yes, LP3982ILD-3.0 requires a 33nF NPO or COG ceramic capacitor between pin 6 (CC) and ground to achieve its specified 37µV_RMS output noise. Omitting this capacitor increases broadband noise by ~2×. The CC pin connects directly to the bandgap reference node, so capacitor leakage must be minimized-NPO/COG types ensure sub-nA leakage. LP3982ILD-3.0 remains functional without CC, but noise performance degrades significantly.

How does the FAULT pin on LP3982ILD-3.0 behave during thermal shutdown?

During thermal shutdown, the FAULT pin on LP3982ILD-3.0 actively pulls low (≤0.25V at 2mA sink) to signal fault condition. It remains asserted until junction temperature falls below ~150°C (10°C hysteresis). The FAULT pin is open-drain and requires an external pull-up resistor (typically 100kΩ) to V_IN or V_OUT. LP3982ILD-3.0 uses this same pin to indicate current limit and pre-dropout conditions-enabling unified fault monitoring without additional sensors.

Can LP3982ILD-3.0 operate stably with a 1µF ceramic output capacitor?

No-LP3982ILD-3.0 is characterized and guaranteed stable only with ≥2.2µF ceramic output capacitance (X5R/X7R dielectric). Using 1µF violates the minimum capacitance requirement and risks oscillation due to insufficient phase margin. The internal zero compensation is optimized for ≥2.2µF; smaller values shift loop gain crossover into unstable regions. LP3982ILD-3.0 datasheet explicitly specifies 2.2µF as the minimum for all operating conditions, including no-load and full-load transients.

Is LP3982ILD-3.0 pin-compatible with MAX8860?

LP3982ILD-3.0 is pin- and package-compatible with Maxim's MAX8860 *only* in the MSOP-8 variant (LP3982IMM-3.0), not the LLP package. The LLP footprint (LDA08C) differs from MAX8860's 8-pin µMAX. Electrical specs align closely-dropout, IQ, and noise-but LP3982ILD-3.0 lacks MAX8860's reverse-battery protection and Dual Mode™ adjustability. For drop-in replacement in existing MSOP designs, use LP3982IMM-3.0-not LP3982ILD-3.0.