Texas Instruments LP2983AIM5-0.9/NOPB

Overview

LP2983AIM5-0.9/NOPB from Texas Instruments (formerly National Semiconductor) is a micropower 150 mA fixed-output LDO voltage regulator in SOT-23-5 package, delivering 0.9 V ±1% (A grade) with ground current as low as 75 µA at 1 mA load and stable operation with zero-ESR ceramic output capacitors. It supports input voltages from 2.2 V to 16 V and operates across −40°C to +125°C junction temperature, targeting ultra-low-power portable applications requiring sub-1.2 V core supply.

For engineers reviewing the LP2983AIM5-0.9/NOPB datasheet, LP2983AIM5-0.9/NOPB pinout, LP2983AIM5-0.9/NOPB application, or LP2983AIM5-0.9/NOPB equivalent, key selection criteria include guaranteed 150 mA output at 0.9 V, ultra-low quiescent current scalability, zero-ESR ceramic capacitor compatibility, thermal/overcurrent protection, and SOT-23-5 board-space efficiency for space-constrained battery-powered designs.

Technical Context

The LP2983AIM5-0.9/NOPB employs a vertically integrated PNP (VIP™) process to achieve high PSRR (65 dB at 1 kHz), low output impedance (0.3 Ω typical, 10 Hz–1 MHz), and tight line regulation (0.016%/V). Its internal architecture enables stable regulation down to 0.9 V while maintaining low dropout - minimum input voltage is 2.05 V at full load.

It integrates an active ON/OFF control pin with defined turn-on (≥1.4 V) and turn-off (≤0.1 V) thresholds, enabling system-level power sequencing. Protection features include foldback current limiting (400 mA short-circuit, 250 mA peak), thermal shutdown, and reverse input-output voltage safeguarding via external Schottky diode recommendation.

Key Specifications

Pinout & Package

LP2983AIM5-0.9/NOPB is housed in a 5-pin SOT-23-5 (NS package MF05A) surface-mount package measuring 2.9 mm × 1.6 mm × 1.1 mm, optimized for minimal PCB footprint and thermal performance on standard FR-4 boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSS721AIDBVR and MCP1703T-0902E/MB, the LP2983AIM5-0.9/NOPB uniquely combines 0.9 V precision regulation, zero-ESR ceramic stability, −40°C to +125°C qualification, and active ON/OFF control in SOT-23-5 - making it optimal for thermally demanding, space-constrained, and battery-sensitive applications requiring robust enable sequencing.

Availability

LP2983AIM5-0.9/NOPB is available at Aetrix Electronics and suitable for cellular phone baseband, wearable sensor hubs, industrial handheld terminals, and medical point-of-care monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LP2983AIM5-0.9/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 acquired National Semiconductor in 2011 and maintains its legacy analog portfolio, including precision regulators like the LP2983 series, with full datasheet, simulation model, and application support.

The LP2983 series was designed specifically for micropower, low-voltage (<1.2 V) regulation in portable electronics - emphasizing ultra-low ground current, ceramic capacitor compatibility, and SOT-23-5 miniaturization without sacrificing protection or accuracy.

FAQ

What is the minimum input voltage required for LP2983AIM5-0.9/NOPB to maintain regulation at 150 mA load?

The LP2983AIM5-0.9/NOPB requires a minimum input voltage of 2.05 V to maintain 0.9 V output regulation at 150 mA load, per Electrical Characteristics table. This low dropout enables operation directly from deeply discharged Li-ion cells (down to ~2.5 V) with margin, unlike many competing LDOs requiring ≥2.7 V input.

Does LP2983AIM5-0.9/NOPB require an external resistor divider to set output voltage?

No, the LP2983AIM5-0.9/NOPB is a fixed-output regulator with internally trimmed 0.9 V reference. The ADJ/SENSE pin (Pin 5) is not externally accessible and is permanently connected to the output node - no external resistors are needed or supported for voltage adjustment.

Can LP2983AIM5-0.9/NOPB be used with a 1 µF ceramic output capacitor?

No - the LP2983AIM5-0.9/NOPB requires a minimum of 2.2 µF ceramic output capacitance for guaranteed stability across temperature and load. Using 1 µF risks oscillation, especially at high ambient temperatures where Z5U/Y5V dielectrics drop below 1 µF; X7R 2.2 µF is the validated minimum.

What is the purpose of the ON/OFF pin on LP2983AIM5-0.9/NOPB, and how should it be handled if unused?

The ON/OFF pin (Pin 4) enables hardware-controlled shutdown: ≥1.4 V turns the regulator on, ≤0.1 V turns it off. If unused, it must be tied directly to VIN to ensure continuous operation - floating or weak pull-up will cause unpredictable behavior due to input leakage and threshold sensitivity.

Is LP2983AIM5-0.9/NOPB compliant with RoHS and lead-free requirements?

Yes, LP2983AIM5-0.9/NOPB carries the /NOPB suffix indicating lead-free (Pb-free) and RoHS-compliant packaging. It meets TI's Banned Substances and Materials of Interest Specification (CSP-9-111S2) and is qualified for commercial and industrial applications with full traceability.