The ADP121 is a low quiescent current, CMOS linear regulator that is available in a 5-lead TSOT or 4-ball 0.4 mm pitch WLCSP package. It offers input voltage range of 2.3 V to 5.5 V, output voltage range of 1.2 V to 3.3 V, output current of 150 mA, low quiescent current (IGND = 11 μA, no load; IGND = 30 μA, 150 mA load), low shutdown current (<1 μA), low dropout voltage (90 mV @ 150 mA load), high PSRR (70 dB @ 1 kHz at VOUT = 1.2 V; 70 dB @ 10 kHz at VOUT = 1.2 V), low noise (40 μV rms at VOUT = 1.2 V), no noise bypass capacitor required, output voltage accuracy of ±1%, 16 fixed output voltage options, current limit and thermal overload protection, logic controlled enable, and 5-lead TSOT or 4-ball 0.4 mm pitch WLCSP package.
The ADP121 is a 150 mA low‑quiescent‑current LDO linear regulator that operates from 2.3 V to 5.5 V and provides fixed output voltages from 1.2 V to 3.3 V. It features a low dropout voltage, high power‑supply‑rejection ratio, low output noise, and integrated current‑limit and thermal‑overload protection.
The device is offered in a 5‑lead TSOT package and a 4‑ball 0.4 mm pitch WLCSP package, enabling a very small footprint for portable and battery‑powered applications such as mobile phones, digital cameras, and other handheld equipment.
| Input voltage range | 2.3 V to 5.5 V |
|---|---|
| Output voltage range | 1.2 V to 3.3 V |
| Maximum output current | 150 mA |
| Dropout voltage (150 mA load, TSOT) | 90 mV |
| Quiescent (shutdown) current | <1 pA |
The ADP121 can deliver up to 150 mA of output current.
The dropout voltage is 90 mV for the TSOT package (135 mV for the WLCSP package).
It includes current‑limit and thermal overload protection, short‑circuit protection, and a shutdown current below 1 pA.
The regulator is offered in a 5‑lead TSOT package and a 4‑ball 0.4 mm pitch WLCSP package.