The SPX3819 is a 500mA low noise LDO voltage regulator with low dropout voltage, low noise output and low static current.
The SPX3819 is a positive‑voltage LDO regulator designed for battery‑powered applications such as cordless phones, radio‑control systems and portable computers. It offers low dropout (340 mV at full load), low output noise (40 µV) and a very low quiescent current of 90 nA.
The device is available in several fixed output voltages (1.2 V to 5.0 V) and in 5‑pin SOT‑23, 8‑pin nSOIC and 8‑pin DFN packages. Pin functions include EN (enable), ADJ/BYP (adjustment/bypass) and standard supply and ground pins. Ordering information, pin‑out diagrams and typical application circuits are provided.
| Dropout Voltage (full load) | 340 mV |
|---|---|
| Line Regulation | 0.04 % |
The regulator drops only 340 mV when delivering its maximum 500 mA load.
Pull the EN pin high above 2.0 V to enable the regulator; pulling it below 0.4 V disables it.
A high‑quality 2.2 µF aluminum electrolytic capacitor works in most circuits, though a 1 µF tantalum can also provide stability.