LD2985 Very low drop and low noise voltage regulator with inhibit function Datasheet - production data to 30 Vrms. Typical application are in cellular phone, palmtop laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera. Table 1. Device summary Order codes Output voltages SOT23-5L LD2985BM18R 1.8 V LD2985BM25R 2.5 V LD2985BM28R 2.8 V Features LD2985BM30R 3.0 V Very low dropout voltage (280 mV at 150 mA LD2985BM31R 3.1 V and 7 mV at 1 mA load) LD2985BM33R 3.3 V Very low quiescent current (2 mA typ. at 150 LD2985BM50R 5.0 V mA load and 80 A at no load) Output current up to 150 mA Logic controlled electronic shutdown Output voltage of 1.8, 2.5, 2.8, 3, 3.1, 3.3, 5 V Internal current and thermal limit Low output noise voltage 30 mVrms Small package SOT23-5L Temperature range: - 40C to 125 C 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 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. An external capacitor, C = 10 nF, connected BYP between bypass pin and GND reduces the noise November 2013 DocID8189 Rev 13 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 . 9 6 Application notes 12 6.1 External capacitors 12 6.2 Input capacitor . 12 6.3 Output capacitor 12 6.4 Important . 12 6.5 Inhibit input operation 12 6.6 Reverse current 13 7 Package mechanical data 14 8 Packaging mechanical data 16 9 Revision history . 17 2/18 DocID8189 Rev 13