Texas Instruments LP2980IM5-1.8/NOPB

Overview

LP2980IM5-1.8/NOPB from Texas Instruments (formerly National Semiconductor) is a 50 mA, fixed 1.8 V low-dropout linear regulator in SOT-23-5 package, optimized for battery-powered systems requiring sub-2 V output. It delivers 0.5% output voltage tolerance (STD grade), <1 μA shutdown current, and 280 μA ground pin current at full 50 mA load - enabling ultra-low-power operation in portable electronics.

For engineers reviewing the LP2980IM5-1.8/NOPB datasheet, LP2980IM5-1.8/NOPB pinout, LP2980IM5-1.8/NOPB application, or LP2980IM5-1.8/NOPB equivalent, key selection criteria include dropout voltage at 1.8 V output, ON/OFF control timing, thermal shutdown behavior, ESR-stable output capacitor requirements, and compatibility with ceramic or tantalum capacitors in space-constrained designs.

Technical Context

The LP2980IM5-1.8/NOPB uses a vertically integrated PNP (VIP®) pass transistor architecture to achieve low dropout (205 mV typical at 50 mA) and high PSRR (63 dB at 1 kHz). Its internal bandgap reference and error amplifier deliver precision regulation across −40°C to +125°C junction temperature range.

It integrates logic-level ON/OFF control (1.4 V turn-on threshold), overtemperature and overcurrent protection, and supports stable operation with output capacitance as low as 2.2 μF - provided ESR falls within specified ranges (e.g., 0.6–6 Ω for 4.7 μF at 50 mA).

Key Specifications

Pinout & Package

SOT-23-5 (NS package MF05A) - 2.92 mm × 1.6 mm × 1.1 mm body, surface-mount, lead-free (RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV70018DBVR and MCP1700T-1802E/TT, the LP2980IM5-1.8/NOPB uniquely balances micropower shutdown (<1 μA), precise 1.8 V output (±1%), and integrated ON/OFF control in SOT-23-5 - making it optimal for legacy portable designs where footprint and deep-sleep current are primary constraints.

Availability

LP2980IM5-1.8/NOPB is available at Aetrix Electronics and suitable for cellular phone, PDA, camcorder, and palmtop computer designs requiring stable component supply and long-term obsolescence management.

Supply support for LP2980IM5-1.8/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 power management portfolio, including legacy LDO families like LP2980.

The LP2980IM5-1.8/NOPB belongs to the LP2980LV micropower LDO family, designed specifically for battery-powered portable electronics needing regulated sub-2 V outputs with minimal quiescent current and small footprint.

FAQ

What is the minimum input voltage required for LP2980IM5-1.8/NOPB to maintain regulation at 50 mA load?

The LP2980IM5-1.8/NOPB requires a minimum input voltage of 2.05 V to sustain 1.8 V output regulation at 50 mA load, resulting in a typical dropout voltage of 205 mV. This allows operation from partially discharged single-cell lithium batteries or dual-cell alkaline sources while maintaining stable output. The device enters dropout when VIN falls below this threshold, causing VOUT to track VIN minus saturation voltage.

Does LP2980IM5-1.8/NOPB support external ON/OFF control, and what are the voltage thresholds?

Yes, LP2980IM5-1.8/NOPB supports logic-level ON/OFF control via Pin 3. A voltage ≥1.4 V enables regulation; ≤0.18 V disables it, reducing quiescent current to <1 μA. The input must swing cleanly across this window with slew rate ≥40 mV/μs to avoid metastable states. If unused, Pin 3 must be tied to VIN to ensure continuous operation.

What output capacitor configurations ensure stability for LP2980IM5-1.8/NOPB at 50 mA load?

For stable operation at 50 mA, LP2980IM5-1.8/NOPB requires an output capacitor with ESR between 0.6 Ω and 6 Ω when using 4.7 μF. A 4.7 μF tantalum capacitor (typical ESR ~0.5–1 Ω) should be paired with a 0.5 Ω series resistor. Alternatively, a 4.7 μF ceramic capacitor (ESR ~10 mΩ) requires a 2 Ω series resistor. Capacitance may be increased to 15 μF to relax ESR constraints (0.1–10 Ω range).

Is LP2980IM5-1.8/NOPB RoHS-compliant and lead-free?

Yes, LP2980IM5-1.8/NOPB is RoHS-compliant and lead-free, as indicated by the "/NOPB" suffix per Texas Instruments' packaging nomenclature. The SOT-23-5 package (MF05A) uses 63Sn/37Pb eutectic bumps in the original National Semiconductor release, but TI's NOPB variant replaces leaded terminations with matte tin plating, meeting JEDEC J-STD-020 reflow standards and EU RoHS Directive 2011/65/EU.

What protection features are built into LP2980IM5-1.8/NOPB?

LP2980IM5-1.8/NOPB integrates thermal shutdown and current limiting to protect against fault conditions. Overtemperature protection activates above +125°C junction temperature, disabling output until safe temperature is restored. Current limiting caps peak output at ~150 mA (typical) and holds short-circuit current at ~150 mA in steady state. These features operate independently of the ON/OFF pin and require no external components.