Analog Devices Announces Two 500mA LDOs for Portable and Battery-powered Equipment

Analog Devices, Inc. (ADI) introduced two low-quiescent-current LDOs (low-dropout linear regulators) which the company says deliver outstanding supply-rejection performance to help battery-operated portable equipment run longer and more efficiently.

According to the company, the new ADP124 and ADP125 LDOs have excellent PSRR (power-supply-rejection ratio) performance of 60 dB at 100 kHz, which is twice that of the nearest competing LDOs, and achieve low noise of 35µVrms (micro-volts per root mean squared) at 1.8V output. Operating from an input voltage between 2.3 and 5.5V and providing up to 500mA of output current down to a 0.8V output, the new LDOs also feature a low quiescent current of 210µA and a 130mV dropout voltage at a 500mA load, which further improves portable equipment operating efficiency over a wide input-voltage range.

"Designing for portable products requires a small solution size, low power dissipation, and high power-supply rejection for the best mixed-signal processing performance, particularly during instances where the power supply is a hidden source of noise," said Walt Heinzer, Product Line Manager, Power Management Group, Analog Devices. "By offering a superior 60-dB PSRR, these high-performance LDOs are 30 dB – or 30X better on a logarithmic scale – when compared to commodity LDOs that offer 25 dB or 30 dB. They surpass competitive alternatives by offering the best combination of very-low dropout, low noise, and high power-supply-rejection ratio at a very competitive price."

The ADP124 offers 31 fixed-output voltage options from 1.75 to 3.3V. The ADP125 LDO provides an adjustable output voltage between 0.8 and 5.0V using an external voltage divider. The ADP124 and ADP125 are specifically designed for stable operation with tiny 1µF ceramic input and output capacitors to meet the requirements of high-performance, space-constrained applications. The LDOs are available in a compact 2 x 2 x 0.55mm LFCSP package or an 8-lead exposed paddle MSOP package.

The units are priced (per 1,000) at $0.42.