The LP3982 is a micropower, ultra low-dropout, low-noise CMOS regulator. It is available in 1.8V, 2.5V, 2.77V, 2.82V, 3.0V, 3.3V, and adjustable versions, delivering 300mA of output current. The LP3982 is suitable for battery powered applications due to its low quiescent current, low dropout voltage, and shutdown mode, allowing for more efficient utilization of battery energy.
The LP3982 low‑dropout (LDO) CMOS linear regulator is offered in several fixed output versions and an adjustable version. It delivers up to 300 mA of output current and is packaged in an 8‑pin MSOP or LLP footprint, making it pin‑compatible with Maxim’s MAX8860. Its low dropout voltage (120 mV typ at 300 mA) and very low shutdown current (1 nA typ) enable efficient use of battery energy down to near‑end‑of‑life voltages.
Key features include a typical quiescent current of 90 µA, 60 dB typical PSRR, 37 µV RMS output voltage noise (10 Hz‑100 kHz), and built‑in fault detection, thermal overload protection, and a shutdown pin. The device is designed for battery‑powered electronics such as wireless handsets, DSP core power supplies, and portable information appliances.
| Output Current | 300 mA |
|---|---|
| Dropout Voltage (typical at 300 mA) | 120 mV |
| Quiescent Current (typical) | 90 µA |
| Shutdown Current (typical) | 1 nA |
| Power Supply Rejection Ratio (typical) | 60 dB |
| Output Voltage Noise (10 Hz‑100 kHz) | 37 µV RMS |
The LP3982 has a typical shutdown current of 1 nA.
The device operates with an input voltage from 2.5 V to 6.0 V.
It can deliver up to 300 mA of output current.
Typical dropout voltage is 120 mV at 300 mA load.