LP3981 Datasheet | National Semiconductor

Description The LP3981’s performance is optimized for battery powered systems to deliver ultra low noise, 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. This 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 300 m A, from a 2.5V to 6V input, consuming less than 1µA in disable mode. The LP3981 is available in MSOP-8 package. For LP3981 in LLP-6 package, contact NSC sales offices. Performance is specified for - 40˚C to +125˚C temperature range. The device available in the following output voltages; 2.5V, 2.7V, 2.8V, 2.83V, 3.0V, 3.03V and 3.3V as standard. Other output options can be made available, please contact your local NSC sales office. n n n n n n n 60d B PSRR at 1k Hz ≤1µA quiescent current when shut down Fast Turn-On time: 120 µs (typ.) with CBYPASS = 0.01u F 132m V typ dropout with 300m A load 35µVrms output noise over 10Hz to 100k Hz - 40 to +125˚C junction temperature range for operation 2.5V, 2.7V, 2.8V, 2.83V, 3.0V, 3.03V, and 3.3V outputs standard Features n Small, space saving MSOP-8 n Low Thermal Resistance in LLP-6 package gives excellent power capability n Logic controlled enable n Stable with ceramic and high quality tantalum capacitors n Fast turn-on n Thermal shutdown and short-circuit current limit Applications n n n n n CDMA cellular handsets Wideband CDMA cellular handsets GSM cellular handsets Portable information appliances Tiny 3.3V ± 5% to 2.5V, 300m A converter Key Specifications n 2.5 to 6.0V input range n 300m A guaranteed output Typical Application Circuit Note: Pin Numbers in parenthesis indicate LLP-6 package. © 2003 National Semiconductor Corporation DS200203 .national. Block...