The LP3990 is a 150mA linear voltage regulator for digital applications. It provides a 0.8V to 3.3V output voltage with 1% output voltage accuracy and 150mA output current.
The LP3990 regulator is designed for portable, battery‑powered applications requiring an accurate output voltage, low noise, and very low quiescent current. It offers a selectable output voltage from 0.8 V to 3.3 V and can be shut down via a logic enable pin, reducing power consumption to virtually zero.
The device is available in lead‑free micro‑SMD (4‑pin) and LLP‑6 (SOT‑23) packages, supports ceramic capacitors as small as 1 µF, and includes thermal‑overload and short‑circuit protection. Detailed electrical characteristics, pin descriptions, ordering information, and typical performance graphs are provided in the document.
| Input Voltage Range | 2 V to 6 V |
|---|---|
| Output Voltage Range | 0.8 V to 3.3 V (selectable) |
| Maximum Output Current | 150 mA |
| Power Supply Rejection Ratio (PSRR) | 55 dB at 1 kHz |
| Turn‑On Time (to 95 % output) | 80 µs (0.8 V), 105 µs (1.5 V), 175 µs (3.3 V) |
| Dropout Voltage | 120 mV (0.8 V), 200 mV (1.5 V) |
| Thermal Shutdown Temperature | 155 °C |
The LP3990 can supply up to 150 mA of output current.
It is offered in a 4‑pin micro SMD package and a 6‑pin LLP (SOT‑23) package, both with lead‑free options.