ST LD2981CM50TR

The LD2981 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 the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. The LD2981 is designed to work with low ESR ceramic capacitor. Typical applications are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.

• 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 100 mA
• 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
• Small package SOT23-5L and SOT-89
• Fast dynamic response to line and load changes

• cellular phone
• palmtop/laptop computer
• personal digital assistant (PDA)
• personal stereo
• camcorder
• camera