LD2981ABM30TR

Overview

The LD2981ABM30TR is a fixed-output positive low-dropout (LDO) voltage regulator manufactured by STMicroelectronics. It provides a precise 3.0V output with a maximum load current of 100mA. The device features an ultra-low quiescent current of 80µA in active mode and less than 1µA in shutdown mode, controlled via a TTL-compatible inhibit pin. It operates within an input voltage range of 2.5V to 16V and maintains high accuracy with ±0.75% output voltage tolerance. The regulator utilizes SOT-23-5 surface-mount packaging and supports operation across a temperature range of -40°C to +125°C.

Feature Summary

• Ultra-low dropout voltage performance ensures efficient regulation even with minimal input-to-output differential.
• Logic-controlled electronic shutdown function allows for system standby modes to minimize total power consumption.
• Low noise output characteristic suitable for sensitive analog circuits and precision instrumentation.
• Integrated thermal and current limiting protection mechanisms safeguard the device under fault conditions.

Applications

• Battery-powered portable electronics requiring extended operational life
• Cellular phones and personal digital assistants (PDAs)
• Precision sensor biasing and analog circuit supply rails
• Personal stereo and camcorder internal power distribution

Procurement Notes

Verify the specific suffix 'BM' indicates the SOT-23-5 package configuration and 'A' denotes the ±0.75% tolerance grade. Confirm that the '30' suffix corresponds to the fixed 3.0V output voltage. Ensure compatibility with lead-free ECOPACK2 soldering profiles if required for assembly processes. Cross-reference the manufacturer part number against official STMicroelectronics documentation to validate authenticity and revision status.

Selection Notes

Select this component when a stable 3.0V rail is required with minimal static power draw. The SOT-23-5 package is ideal for space-constrained designs. The wide input voltage range up to 16V accommodates various battery chemistries. The inhibit pin enables dynamic power management strategies not available in standard LDOs. Consider the low noise profile for applications sensitive to power supply ripple.

Part Context

This device belongs to the LD2981 family of ultra-low drop voltage regulators designed for low-noise and low-power applications. The family offers multiple fixed output voltages and packages, including SOT-89 and SOT-23 variants. The LD2981 series is engineered to work efficiently with low ESR ceramic capacitors, simplifying board layout and reducing component count compared to older regulator technologies.

Replacement Considerations

Direct replacements include other LD2981 variants with different output voltages or packages, such as LD2981ABM33TR for 3.3V output. Verify pinout compatibility before substituting with non-ST linear regulators. Ensure any alternative device meets the same 100mA current capability and low quiescent current specifications.