The LD2981 series are 100mA fixed-output voltage regulator. The low drop-voltage and the ultra low quiescent current make them suitable for low noise, low power applications and in battery powered systems. The quiescent current in sleep mode is less than 1µA when INHIBIT pin is pulled low.
The LD2981 series are ultra‑low dropout voltage regulators with very low quiescent current, suitable for low‑noise, low‑power and battery‑powered applications. They offer a range of fixed output voltages from 1.5 V to 5.0 V, an inhibit pin for electronic shutdown, and are designed to work with low‑ESR ceramic capacitors.
The document includes absolute maximum ratings, thermal data, pin descriptions, ordering codes, detailed electrical characteristics for each voltage version, typical performance curves, mechanical dimensions for tape‑and‑reel packaging, and legal disclaimer information.
| Output voltage options | 1.5 V, 1.8 V, 2.5 V, 2.85 V, 3.0 V, 3.2 V, 3.3 V, 3.6 V, 3.8 V, 4.0 V, 4.7 V, 4.85 V, 5.0 V |
|---|---|
| Maximum input voltage | -0.3 V to 16 V |
| Operating temperature range | -40 °C to 125 °C |
| Quiescent current (ON mode) | 80 µA typical, max 100 µA |
| Quiescent current (OFF mode) | < 1 pA |
| Dropout voltage | 1 – 3 mV (typical) |
| Maximum output current | 100 mA |
| Available packages | SOT23‑5L, SOT‑89 |
The quiescent current in sleep mode is less than 1 pA when the INHIBIT pin is pulled low.
The device can handle an input voltage from –0.3 V up to 16 V.
The series provides fixed output voltages of 1.5 V, 1.8 V, 2.5 V, 2.85 V, 3.0 V, 3.2 V, 3.3 V, 3.6 V, 3.8 V, 4.0 V, 4.7 V, 4.85 V and 5.0 V.
The LD2981 is offered in the SOT23‑5L and SOT‑89 surface‑mount packages.