STMicroelectronics LD2980ABM30TR

Overview

LD2980ABM30TR from STMicroelectronics is a 3.0 V fixed-output ultra-low-dropout linear voltage regulator in SOT23-5L package, delivering up to 50 mA with 7 mV typical dropout at 1 mA load, 80 µA typical quiescent current in active mode, and <1 µA shutdown current-designed for battery-powered portable electronics requiring stable low-noise supply.

For engineers reviewing the LD2980ABM30TR datasheet, LD2980ABM30TR pinout, LD2980ABM30TR application, or LD2980ABM30TR equivalent, key selection criteria include dropout voltage at light load, inhibit logic thresholds (0.18 V low, 1.3 V high), ±0.5% output tolerance, 160 µVRMS noise, and compatibility with low-ESR ceramic capacitors down to 2.2 µF.

Technical Context

The LD2980ABM30TR uses a PNP pass transistor architecture enabling ultra-low dropout and minimal quiescent current across temperature. Its inhibit pin (Pin 3) accepts TTL-compatible logic control with no internal pull-up, requiring external biasing to VI or GND for reliable ON/OFF operation.

Stability is guaranteed with low-ESR ceramic output capacitors (≥2.2 µF for 3.0 V version), and the device features internal current limiting, thermal shutdown at 170 °C, and reverse-current blocking-no body diode conduction from VOUT to VIN under reverse bias.

Key Specifications

Pinout & Package

SOT23-5L: 5-pin surface-mount package (2.95 × 1.60 mm footprint, 1.3 mm max height), RoHS-compliant and ECOPACK® qualified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3002E/TT and NCP1117DT30T5G, the LD2980ABM30TR uniquely balances ultra-low dropout (7 mV), low-noise (160 µVRMS), and precise ±0.5% output tolerance - making it optimal for space-constrained, battery-operated, noise-sensitive applications where 50 mA is sufficient.

Availability

LD2980ABM30TR is available at Aetrix Electronics and suitable for cellular handsets, wearable sensors, portable medical monitors, and industrial wireless sensors requiring stable component supply with guaranteed long-term availability.

Supply support for LD2980ABM30TR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, analog chips, and MEMS sensors for automotive, industrial, and consumer markets.

The LD2980 belongs to ST's ultra-low-I_Q LDO family targeting portable and battery-powered applications where minimal dropout, low noise, and sub-µA shutdown current are critical system requirements.

FAQ

What is the minimum input voltage required for regulation at 3.0 V output?

The LD2980ABM30TR maintains regulation with input as low as 3.007 V at 1 mA load (7 mV dropout). At 50 mA, dropout rises to 120–150 mV, so minimum input is 3.12–3.15 V. Input must stay within 2.5–16 V absolute maximum ratings.

Can the INHIBIT pin be left unconnected?

No - the INHIBIT pin has no internal pull-up or pull-down. Leaving it floating risks undefined output state and potential malfunction. It must be actively driven to VIN (for always-on) or GND (for shutdown), or biased via resistor to a valid logic level.

Is an output capacitor mandatory, and what type is recommended?

Yes - a minimum 2.2 µF low-ESR ceramic capacitor (X7R or X5R) is required for stability at 3.0 V output. Tantalum may work but is not recommended due to higher ESR, cost, and size. The capacitor must be placed within 12.7 mm of VOUT and GND pins.

Does the LD2980ABM30TR support reverse-voltage protection?

It provides reverse-current blocking: when VOUT exceeds VIN, no significant current flows through the pass transistor. However, it does not protect against reverse-polarity input voltage - an external diode or MOSFET is required if VIN polarity reversal is possible.