The ADP122/ADP123 is a 5.5V input, 300mA output, low quiescent current, CMOS linear regulator from Analog Devices. It features a wide input voltage range (2.3V-5.5V), high output current (300mA), low dropout voltage (85mV), low quiescent current (45µA), low start-up current (<1µA), high initial accuracy (±1%), wide output voltage range (1.75V-3.3V), excellent PSRR performance (60dB@100kHz), excellent load/line transient response (using small 1.0μF ceramic capacitors), overcurrent protection, thermal overload protection, logic controlled enable, and a compact package (5-lead TSOT and 6-lead 2mm×2mm LFCSP).
The ADP122 and ADP123 are low‑quiescent, low‑dropout linear regulators from Analog Devices. They operate from 2.3 V to 5.5 V input and deliver up to 300 mA output current, with very low dropout voltage and shutdown current for battery‑powered designs.
The handbook provides detailed specifications, pin configurations, thermal data, recommended capacitor selections, and typical application circuits for both the fixed‑output ADP122 (31 voltage options) and the adjustable‑output ADP123.
| Input voltage range | 2.3 V to 5.5 V |
|---|---|
| Maximum output current | 300 mA |
| Dropout voltage at 300 mA | 85 mV |
| Quiescent current (no load) | 45 pA |
| Shutdown current | < 1 pA |
| Available packages | 5‑lead TSOT, 6‑lead 2 mm × 2 mm LFCSP |
The dropout voltage is 85 mV when the regulator supplies 300 mA.
The ADP122 draws 45 pA of quiescent current with no load.
Both devices are available in a 5‑lead TSOT package and a 6‑lead 2 mm × 2 mm LFCSP package.
The regulators can supply up to 300 mA of output current.