The LD3985 is a low-power three-terminal regulator with an input voltage range of 2.5V to 6V and an output voltage range of 1.2V to 5V. It features ultra-low dropout voltage, low quiescent current, low noise, logic-controlled electronic shutdown, internal current and thermal limiting, and is suitable for low-power applications and battery-powered systems.
The LD3985 series provides ultra‑low dropout voltage regulators with very low quiescent current and low output noise, suitable for battery‑powered and low‑power applications. It operates from 2.5 V to 6 V input and delivers up to 150 mA output current with typical dropout of 100 mV at 150 mA.
The document includes absolute maximum ratings, thermal data, order codes, pin descriptions, electrical characteristics, and typical application circuits, along with revision history and regulatory notices.
| Input voltage range | 2.5 V to 6 V |
|---|---|
| Maximum output current | 150 mA |
| Dropout voltage (typical at 150 mA) | 100 mV |
| Quiescent current (no‑load) | 85 nA typ |
| Output noise voltage | 30 nV RMS (10 Hz‑100 kHz) |
| Operating temperature range | -40 °C to 125 °C |
The LD3985 operates from 2.5 V to 6 V input voltage.
It can supply up to 150 mA of output current.
The typical quiescent current is 85 nA with no load.
The typical dropout voltage is 100 mV at a 150 mA load.