The LP3982 is a micropower, ultra low-dropout, low-noise CMOS linear regulator available in various voltage versions. It provides an output current of 300mA. The LP3982 is suitable for battery-powered applications due to its low shutdown current, low quiescent current, and low dropout voltage. It features stable operation with small ceramic capacitive loads, high power supply rejection ratio (PSRR), wide input voltage range, fast turn-on time, low output voltage noise, and over temperature/over current protection.
The LP3982 is a low‑dropout (LDO) CMOS linear regulator available 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. Designed for battery‑powered applications, it features a 1 nA typical shutdown current, 90 µA typical quiescent current, and a typical dropout voltage of 120 mV at 300 mA.
The device includes a bandgap reference, error amplifier, PMOS pass transistor, fault detection, and thermal overload protection. It is stable with small ceramic output capacitors (2.2 µF typical) and offers a 60 dB typical power‑supply‑rejection ratio. Application information covers output‑voltage setting, capacitor selection, shutdown operation, and typical performance curves.
| Output Current | 300 mA (guaranteed) |
|---|---|
| Dropout Voltage | 120 mV typical @ 300 mA |
| Quiescent Current | 90 µA typical |
| Shutdown Current | 1 nA typical |
| Input Voltage Range | 2.5 V to 6 V |
| Output Voltage Noise | 37 µV RMS (10 Hz‑100 kHz) |
| Power‑Supply Rejection Ratio | 60 dB typical |
The LP3982 has a typical shutdown current of 1 nA.
The device draws about 90 µA of quiescent current under typical conditions.
It operates with an input voltage from 2.5 V up to 6 V.
The regulator is rated for a guaranteed output current of 300 mA.