The LP3999 is a low noise, 150mA voltage regulator designed for RF/Analog applications.
The LP3999 regulator is designed for portable wireless and battery‑powered applications, providing accurate output voltage with low noise and low quiescent current. It includes an enable pin for virtually zero power consumption when disabled and internal short‑circuit and over‑temperature protection.
Key features include a 2.5 V‑6.0 V input range, fixed output options from 1.5 V to 3.3 V, 60 mV typical dropout at 150 mA, 10 µVrms output noise (10 Hz‑100 kHz), and a guaranteed 150 mA output current. The device is offered in 5‑pin micro‑SMD and 6‑pin LLP packages and operates from –40 °C to +125 °C.
| Input Voltage Range | 2.5 V to 6.0 V |
|---|---|
| Output Voltage Range | 1.5 V to 3.3 V (fixed options) |
| Typical Dropout Voltage (150 mA load) | 60 mV |
| Quiescent Current (disabled) | Virtually zero (≈3 nA) |
| Output Noise | 10 µVrms (10 Hz‑100 kHz) |
| Maximum Output Current | 150 mA |
| Thermal Shutdown Temperature | 160 °C |
The typical dropout voltage is 60 mV.
When disabled, the regulator draws virtually zero current, about 3 nA.
It operates from –40 °C to +125 °C.