LD2981ABU50TR

$0.75

Description：IC REG LINEAR 5V 100MA SOT89-3
Series：-
Mfr：STMicroelectronics
Package：Tape & Reel (TR),Cut Tape (CT)

SKU:939290fabe78 Category: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Brand: STMicroelectronics

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Product introduction

Product Detailed Parameters

Description：IC REG LINEAR 5V 100MA SOT89-3
Series：-
Mfr：STMicroelectronics
Package：Tape & Reel (TR),Cut Tape (CT)
Output Configuration：Positive
Output Type：Fixed
Number of Regulators：1
Voltage - Input (Max)：16V
Voltage - Output (Min/Fixed)：5V
Voltage - Output (Max)：-
Voltage Dropout (Max)：0.375V @ 100mA
Current - Output：100mA
Current - Quiescent (Iq)：150 µA
Current - Supply (Max)：2.6 mA
PSRR：63dB (1kHz)
Control Features：-
Protection Features：Over Current, Over Temperature
Operating Temperature：-40°C ~ 125°C
Mounting Type：Surface Mount
Package / Case：TO-243AA
Supplier Device Package：SOT-89-3
Grade：-
Qualification：-

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LD2981ABU50TR

Overview

The LD2981ABU50TR is a fixed-output positive low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a stable 5.0 V output with a maximum continuous current of 100 mA. The device features an ultra-low quiescent current of 80 µA in normal operation and less than 1 µA when the inhibit pin is pulled low. It operates within an input voltage range of 2.5 V to 16 V and maintains high accuracy with a ±0.75% output voltage tolerance. The component is housed in a surface-mount SOT-89-3 package and supports operation across a temperature range of -40 °C to +125 °C.

Feature Summary

Ultra-low dropout voltage performance suitable for battery-powered systems
Logic-controlled electronic shutdown via TTL-compatible inhibit pin
Internal protection against overcurrent and thermal overload

Applications

Cellular phones
Palmtop and laptop computers
Personal digital assistants (PDA)
Camcorders and cameras

Procurement Notes

Verify the specific suffix 'BU' indicates the SOT-89-3 package configuration, as other suffixes like 'CM' or 'CU' may denote different packages such as SOT-23-5L. Confirm that the 'A' version meets the required ±0.75% output voltage tolerance specification. Ensure the application circuit utilizes low ESR ceramic capacitors as recommended for stability with this regulator series.

Selection Notes

Select this component when a fixed 5 V rail is required with minimal power consumption in portable devices. The logic-controlled shutdown feature allows for system standby modes, reducing total power usage. Verify that the input voltage remains within the 2.5 V to 16 V range and that the load current does not exceed 100 mA. Consider the SOT-89-3 package constraints for thermal management and PCB layout.

Part Context

This part belongs to the LD2981 family of ultra-low drop voltage regulators designed for low noise and low power applications. The family includes variants with different output voltages (2.5 V, 3.0 V, 3.3 V, 5.0 V) and packages (SOT-23-5L, SOT-89). The LD2981 series is characterized by fast dynamic response to line and load changes and internal current and thermal limiting protections.