STMicroelectronics | LD2981ABM33TR

The LD2981ABM33TR is a 100 mA fixed-output voltage regulator. The low drop-voltage and the ultra low quiescent current make them suitable for low noise, low power applications and in battery powered systems.

The quiescent current in sleep mode is less than 1 μA when INHIBIT pin is pulled low.
Shutdown logic control function is available on pin n° 3 (TTL compatible). This means that when thedevice is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. The LD2981AB/C is designed to work with low ESR ceramic capacitor.

Features:

• Stable with low ESR ceramic capacitors
• Ultra low dropout voltage (0.17 V typ. at 100 mA load, 7 mV typ. at 1 mA load)
• Very low quiescent current (80 μA typ. at no load in on mode; max 1 μA in off mode)
• Guaranteed output current up to 100mA
• Logic-controlled electronic shutdown
• Output voltage of 2.5; 3.0; 3.3; 5.0 V
• Internal current and thermal limit
• ±0.75 % tolerance output voltage available (A version)
• Output low noise voltage 160 μVRMS
• Temperature range: -40 to 125 °C
• Smallest package SOT23-5L and SOT-89
• Fast dynamic response to line and load changes

Applications:

• Cellular phone
• Palmtop/laptop computer
• Personal digital
• Assistant (PDA)
• Personal stereo
• Camcorder
• Camera