LD2981 Ultra low-drop voltage regulators with inhibit Datasheet - production data Description 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. SOT23-5L SOT-89 The quiescent current in sleep mode is less than 1 A when INHIBIT pin is pulled low. Shutdown logic control function is available on pin n 3 (TTL compatible). This means that when the Features device is used as local regulator, it is possible to Ultra low dropout voltage (0.17 V typ. at 100 put a part of the board in standby, decreasing the mA load, 7 mV typ. at 1 mA load) total power consumption. The LD2981 is designed to work with low ESR ceramic capacitor. Very low quiescent current (80 A typ. at no Typical applications are in cellular phone, load in on mode max 1 A in off mode) palmtop/laptop computer, personal digital Guaranteed output current up to 100mA assistant (PDA), personal stereo, camcorder and Logic-controlled electronic shutdown camera. 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 V RMS Temperature range: -40 to 125 C Small package SOT23-5L and SOT-89 Fast dynamic response to line and load changes March 2015 DocID6279 Rev 16 1/25 This is information on a product in full production. www.st.comContents LD2981 Contents 1 Diagram . 3 2 Pin configuration . 4 3 Maximum ratings 5 4 Typical application 6 5 Electrical characteristics . 7 6 Typical performance characteristics . 10 7 Application notes 13 7.1 External capacitors 13 7.2 Input capacitor . 13 7.3 Output capacitor 13 7.4 Important . 13 7.5 Inhibit input operation 13 7.6 Reverse current 14 8 Package information 15 8.1 SOT23-5L package information 15 8.2 SOT23-5L packing information . 17 8.3 SOT-89 package information 18 8.4 SOT-89 packing information . 21 9 Ordering information . 23 10 Revision history . 24 2/25 DocID6279 Rev 16