LP3984 Datasheet | National Semiconductor

Description The LP3984 is designed for portable and wireless applications with demanding performance and space requirements. The LP3984’s performance is optimized for battery powered systems to deliver extremely low dropout voltage and low quiescent current. Regulator ground current increases only slightly in dropout, further prolonging the battery life. Power supply rejection is better than 60 d B at low frequencies and starts to roll off at 10 k Hz. High power supply rejection is maintained down to lower input voltage levels mon to battery operated circuits. The device is ideal for mobile phone and similar battery powered wireless applications. It provides up to 150 m A, from a 2.5V to 6V input, consuming less than 1.2µA in disable mode and has fast turn-on time less than 20µs. The LP3984 is available in micro SMD and 5 pin SOT-23 package. Performance is specified for - 40˚C to +125˚C temperature range and is available in 1.5V, 1.8V, 2.0V, and 3.1V output voltages. For other output voltage options from 1.5V to 3.5V, please contact National Semiconductor sales office. n n n n n n 60d B PSRR at 1k Hz, 40d B at 10k Hz @ 3.1VIN ≤1.2µA quiescent current when shut down Fast Turn-On time: 20 µs (typ.) 75m V typ dropout with 150m A load - 40 to +125˚C junction temperature range for operation 1.5V, 1.8V, 2.0V, and 3.1V Features n n n n n n Miniature 4-I/O micro SMD and SOT-23-5 package Logic controlled enable Stable with tantalum capacitors 1 µF Tantalum output capacitor Fast turn-on Thermal shutdown and short-circuit current limit Applications n n n n CDMA cellular handsets Wideband CDMA cellular handsets GSM cellular handsets Portable information appliances Key Specifications n 2.5 to 6.0V input range n 150m A guaranteed output Typical Application Circuit Note: Pin Numbers in parenthesis indicate micro SMD package. © 2001 National Semiconductor Corporation DS200204 .national. Block Diagram Pin Descriptions Name VEN GND VOUT VIN N.C. µSMD 4 1 2...