LP3985 is a micropower, 150mA low-noise ultra low-dropout CMOS voltage regulator designed for portable and wireless applications with demanding performance and space requirements. It delivers ultra low noise, extremely low dropout voltage, and low quiescent current optimized for battery powered systems. It has good power supply rejection and is suitable for low input voltage levels common to battery operated circuits. It is an ideal choice for mobile phone and similar battery powered wireless applications.
The LP3985 is a micropower LDO designed for portable and wireless devices that need low noise, low dropout voltage and minimal quiescent current. It operates from a 2.5 V to 6 V input range and can supply up to 150 mA, making it suitable for mobile phones and other battery‑powered equipment.
The device is offered in several compact packages, including 5‑bump micro SMD, large‑bump micro SMD, thin micro SMD and a 5‑pin SOT‑23. It features a fast turn‑on time of about 200 µs, a typical output noise of 30 µVrms (10 Hz‑100 kHz), and a PSRR of better than 50 dB at low frequencies.
| Maximum Output Current | 150 mA |
|---|---|
| Input Voltage Range | 2.5 V to 6 V |
| Dropout Voltage (typical @150 mA) | 100 mV |
| Shutdown Quiescent Current | <1.5 µA |
| Power Supply Rejection Ratio (1 kHz) | ≥50 dB |
| Output Noise (10 Hz‑100 kHz) | 30 µVrms |
| Operating Temperature Range | -40 °C to +125 °C |
The LP3985 can deliver up to 150 mA of output current.
The shutdown quiescent current is less than 1.5 µA.
It is offered in 5‑bump small‑bump micro SMD, 5‑bump large‑bump micro SMD, 5‑bump thin micro SMD, and a 5‑pin SOT‑23 package.
The typical turn‑on time is about 200 µs.