LD2985 Very low drop and low noise voltage regulator with inhibit function Datasheet - production data Description The LD2985 is a 150 mA fixed output voltage regulator. The ultra low drop voltage and the low quiescent current make them particularly suitable for low noise, low power applications, and in battery powered systems. In sleep mode quiescent current is less than 1 A when INHIBIT SOT23-5L pin is pulled low. Shutdown logic control function is available on pin 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. Features An external capacitor, C = 10 nF, connected BYP Very low dropout voltage (280 mV at 150 mA between bypass pin and GND reduces the noise and 7 mV at 1 mA load) to 30 Vrms. Typical application are in cellular phone, palmtop laptop computer, personal digital Very low quiescent current (2 mA typ. at 150 assistant (PDA), personal stereo, camcorder and mA load and 80 A at no load) camera. Output current up to 150 mA Logic controlled electronic shutdown Table 1. Device summary Output voltage of 1.8, 2.5, 2.8, 3, 3.1, 3.3, 5 V Order codes Output voltages Internal current and thermal limit LD2985BM18R 1.8 V Low output noise voltage 30 Vrms LD2985BM25R 2.5 V Small package SOT23-5L LD2985BM28R 2.8 V Temperature range: - 40 C to 125 C LD2985BM30R 3.0 V LD2985BM31R 3.1 V LD2985BM33R 3.3 V LD2985BM50R 5.0 V August 2021 DocID8189 Rev 16 1/18 This is information on a product in full production. www.st.com 18Contents LD2985 Contents 1 Diagram . 3 2 Pin configuration 4 3 Maximum ratings 5 4 Electrical characteristics . 6 5 Typical characteristics . 8 6 Application notes 11 6.1 External capacitors .11 6.2 Input capacitor 11 6.3 Output capacitor .11 6.4 Important 11 6.5 Inhibit input operation .11 6.6 Reverse current 12 7 Package information 13 8 Packing information 15 9 Revision history . 17 2/18 DocID8189 Rev 16