Texas Instruments LP2980IM5-ADJ/NOM3

Overview

LP2980IM5-ADJ/NOM3 from Texas Instruments is an adjustable-output, low-dropout linear regulator delivering up to 50 mA with 1.2 V to 15.0 V output range, ±0.5% typical output accuracy, and 55 μA quiescent current at zero load - designed for precision biasing of low-voltage MCUs and post-regulation filtering in DC/DC systems.

For engineers reviewing the LP2980IM5-ADJ/NOM3 datasheet, LP2980IM5-ADJ/NOM3 pinout, LP2980IM5-ADJ/NOM3 application, or LP2980IM5-ADJ/NOM3 equivalent, key selection criteria include dropout voltage at 50 mA (≤145 mV), PSRR of 70 dB at 1 kHz, thermal shutdown at 170°C, stability with 2.2-μF ceramic output capacitors, and enable-controlled power sequencing in space-constrained SOT-23-5 layouts.

Technical Context

The LP2980IM5-ADJ/NOM3 uses a PNP pass transistor architecture with internal bandgap reference (1.2 V) and feedback loop via ADJ pin, enabling precise external resistor-divider programming of output voltage. Its UVLO circuit activates at 2.2 V (rising) and resets at 2.07 V, ensuring reliable startup under brownout conditions.

It integrates soft-start, overcurrent limiting (160 mA short-circuit current), thermal shutdown (170°C trip, 150°C reset), and active pulldown during disable - all within a –40°C to +125°C operating junction temperature range. The new-chip revision (M3 suffix) improves PSRR, reduces ground current, and lowers output capacitance requirement versus legacy variants.

Key Specifications

Pinout & Package

LP2980IM5-ADJ/NOM3 is housed in a 5-pin SOT-23 (DBV) package measuring 2.9 mm × 1.6 mm, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-ADJ/MB and TLS850F0TESA1, LP2980IM5-ADJ/NOM3 offers superior input voltage range (up to 16 V), tighter output accuracy (±0.5% vs ±1%), and lower quiescent current (55 μA vs 120 μA), making it optimal for industrial and commercial systems where precision, efficiency, and wide-input operation are critical.

Availability

LP2980IM5-ADJ/NOM3 is available at Aetrix Electronics and suitable for residential breakers, solid state drives (SSD), and electricity meters requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LP2980IM5-ADJ/NOM3 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 LDO design expertise and broad industrial qualification.

The LP2980-ADJ product line delivers high-accuracy, low-power adjustable LDOs for precision biasing in metering, automation, and storage systems - emphasizing thermal robustness, small-footprint packaging, and compatibility with modern ceramic capacitors.

FAQ

What is the maximum input voltage rating for LP2980IM5-ADJ/NOM3?

The LP2980IM5-ADJ/NOM3 has an absolute maximum continuous input voltage of 18 V for the new-chip revision (M3 suffix), with recommended operating range of 2.5 V to 16 V. Exceeding 18 V risks permanent damage, and operation below 2.5 V may cause dropout or UVLO activation. Always verify VIN against the specific application's transient profile and include appropriate input clamping if surge-prone.

How do I calculate the output voltage of LP2980IM5-ADJ/NOM3 using external resistors?

The output voltage of LP2980IM5-ADJ/NOM3 is set by VOUT = 1.2 V × (1 + R1/R2), where R1 connects between VOUT and ADJ, and R2 connects between ADJ and GND. For example, R1 = 10 kΩ and R2 = 4.02 kΩ yields VOUT ≈ 4.2 V. Use 1% tolerance resistors and keep ADJ node impedance low (<100 kΩ) to minimize error from ADJ pin bias current (≤30 nA).

Does LP2980IM5-ADJ/NOM3 require a feed-forward capacitor (CFF)?

Yes - the LP2980IM5-ADJ/NOM3 benefits from a 10-pF feed-forward capacitor (CFF) between ADJ and GND to improve transient response and PSRR above 100 kHz. TI recommends CFF = 10 pF for new-chip variants; omitting it degrades high-frequency ripple rejection by up to 15 dB. Place CFF as close as possible to the ADJ pin with short traces.

What thermal performance can I expect from LP2980IM5-ADJ/NOM3 in a standard PCB layout?

In a JEDEC-standard 2s2p board, LP2980IM5-ADJ/NOM3 exhibits RθJA = 178.6°C/W. At 50 mA output into 3.3 V with 12 V input (7.5°C/W power dissipation), junction temperature rise is ~134°C above ambient - exceeding safe limits. Use thermal vias, copper pours, or reduced load to stay within –40°C to +125°C TJ. Derate output current above 85°C ambient.

Is LP2980IM5-ADJ/NOM3 compatible with ceramic output capacitors smaller than 2.2 µF?

No - LP2980IM5-ADJ/NOM3 requires a minimum effective output capacitance of 1 μF after 50% derating, meaning nominal COUT must be ≥2.2 μF. Using smaller ceramics risks instability, overshoot, or oscillation. TI validates stability only with ≥2.2-μF X5R/X7R MLCCs; avoid COG/NPO below 2.2 μF unless re-characterized per application.