the lp3981 is an ultra low dropout cmos voltage regulator from nsc company. it features high performance, low power consumption and low noise. the product is ideal for mobile phone and similar battery powered wireless applications. it provides up to 300ma of current, input voltage range from 2.5v to 6v, and consumes less than 1µa in disable mode. the lp3981 is available in msop-8 package, and can provide 2.5v, 2.7v, 2.8v, 2.83v, 3.0v, 3.03v and 3.3v standard output voltages. other output voltages can be customized according to customer needs.
The LP3981 is a micropower LDO regulator optimized for battery‑powered systems. It delivers up to 300 mA with ultra‑low noise, low dropout voltage, and very low quiescent current, making it suitable for mobile phones and other wireless devices.
The device is offered in two compact packages (MSOP‑8 and LLP‑6) and operates over a wide temperature range (‑40 °C to +125 °C). Detailed electrical characteristics, ordering information, and typical performance graphs are provided.
| Output current | 300 mA |
|---|---|
| Input voltage range | 2.5 V – 6 V |
| Power‑supply rejection ratio | 60 dB at 1 kHz |
| Typical dropout voltage (300 mA) | 132 mV |
| Output noise | 35 µVrms (10 Hz – 100 kHz) |
| Operating temperature range | ‑40 °C – +125 °C |
| Turn‑on time | 120 ps typ |
The typical dropout voltage is 132 mV at a 300 mA load.
It operates from 2.5 V up to 6 V input.
The regulator is offered in MSOP‑8 and LLP‑6 packages.