In an effort to help battery-operated portable equipment run longer and more efficiently, Analog Devices Inc. (ADI) designed
its latest LDOs (low-dropout linear regulators) to provide PSRR performance of 60dB at 100 kHz, which it claims is twice that of the nearest competing devices.
Designated the ADP124 and ADP125, ADI's LDOs achieve low noise of 35 µVrms at 1.8 V output. Operating from an input voltage between 2.3 V and 5.5 V and providing up to 500 mA of output current down to a 0.8 V output, the LDOs also feature a low quiescent current of 210 μA and a 130 mV dropout voltage at a 500 mA load, which further improves portable equipment operating efficiency over a wide input-voltage range.
- 60-dB PSSR at 100 kHz keeps higher frequencies from mixing into RF loads
- An initial 1% accuracy provides tight tolerances for core voltage rails in FPGA apps
- Low-dropout voltage of 130 mV at 500 mA minimizes power loss, allows operation further down the battery discharge curve.
- Low noise of 35 µVRMS at 1.8Vout provides clean power supply to high-performance A/D converters without the addition of extra output bypass capacitors.
- Stability with 1 µF Cout ceramic capacitors maintains compact footprint for space sensitive applications.
Pricing: $0.42 each in 1ku.
Availability: Volume production.
Datasheets: ADP124 and ADP125