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LP3981 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LP3981 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 11 page  LP3981 Micropower, 300mA Ultra Low-Dropout CMOS Voltage Regulator General 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 dB at low frequen- cies. This high power supply rejection is maintained down to lower input voltage levels common to battery operated cir- cuits. The device is ideal for mobile phone and similar battery powered wireless applications. It provides up to 300 mA, 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 de- vice 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. Key Specifications n 2.5 to 6.0V input range n 300mA guaranteed output n 60dB PSRR at 1kHz n ≤1µA quiescent current when shut down n Fast Turn-On time: 120 µs (typ.) with C BYPASS = 0.01uF n 132mV typ dropout with 300mA load n 35µVrms output noise over 10Hz to 100kHz n −40 to +125˚C junction temperature range for operation n 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 CDMA cellular handsets n Wideband CDMA cellular handsets n GSM cellular handsets n Portable information appliances n Tiny 3.3V ± 5% to 2.5V, 300mA converter Typical Application Circuit 20020302 Note: Pin Numbers in parenthesis indicate LLP-6 package. March 2003 © 2003 National Semiconductor Corporation DS200203 www.national.com |
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