LP3999 is a low noise 150mA voltage regulator designed for RF/Analog applications. It provides low noise and low quiescent current, and can provide accurate output voltage for battery powered applications. The device can also be used to meet more general circuit requirements.
The LP3999 regulator is designed for portable wireless and battery‑powered RF/analog devices. It provides an accurate output voltage with low noise (40 µVrms 10 Hz‑100 kHz) and a typical dropout of only 60 mV at 150 mA load, while the enable pin can reduce quiescent current to virtually zero when disabled.
Available in a 5‑pin micro‑SMD package and a 6‑lead LLP (SOT23) package, the device supports fixed output voltages from 1.5 V to 3.3 V. The datasheet includes detailed electrical characteristics, ordering information, and mechanical dimensions for board layout.
| Input Voltage Range | 2.5 V to 6.0 V |
|---|---|
| Maximum Output Current | 150 mA |
| Typical Dropout Voltage | 60 mV at 150 mA |
| Output Noise | 40 µVrms (10 Hz‑100 kHz) |
| Enable Input Voltage Range | 0 V to 6.0 V |
| Turn‑On Time | 140 µs (typ.) |
The enable pin accepts voltages from 0 V up to 6.0 V.
It is offered in a 5‑pin micro‑SMD package and a 6‑lead LLP (SOT23) package.
The device exhibits 40 µVrms output noise over the 10 Hz‑100 kHz bandwidth.
Typical turn‑on time is 140 µs.