The LP3992 regulator is a micropower 1.5V CMOS voltage regulator with shutdown control. It is designed for portable, battery-powered systems and provides an accurate output voltage, low noise, and low quiescent current. The LP3992 can prolong battery life by providing a 1.5V output from a low input voltage of 1.9V. It also features short-circuit and thermal-shutdown protection. The device is stable with small ceramic capacitors and is available in an SOT23-5 package.
The LP3992 regulator is designed for portable, battery‑powered systems that need an accurate 1.5 V output from a low input voltage of 1.9 V. It features a logic‑controlled shutdown pin that reduces power consumption to virtually zero, short‑circuit and thermal‑overload protection, and stable operation with ceramic capacitors as small as 1 µF.
Typical applications include CMOS RAM keep‑alive circuits and other low‑power loads. The device is supplied in a 5‑pin SOT23‑5 package, operates from –40 °C to +125 °C, and can deliver up to 30 mA of output current while maintaining low output noise (300 µVRMS).
| Input voltage range | 1.9 V to 5.2 V |
|---|---|
| Output voltage | 1.5 V ±0.09 V |
| Quiescent current (shutdown) | < 1.5 µA |
| Maximum output current | 30 mA |
| Output noise | 300 µVRMS |
| Shutdown pin thresholds | ≤ 0.4 V disables, ≥ 1.15 V enables |
| Package | SOT23‑5 (5‑pin) |
| Operating temperature range | -40 °C to +125 °C |
The SD pin disables the regulator when its voltage is ≤ 0.4 V and enables it when the voltage is ≥ 1.15 V.
In shutdown mode the device consumes less than 1.5 µA of quiescent current, effectively near zero.
The regulator can deliver up to 30 mA of output current while maintaining regulation.