ADI introduces LDOs with good PSRR

Earlier in the month I told you about TI’s LDOs with good PSRR. Today I received a press release from Analog Devices pointing out that they are introducing 500mA LDOs (low-drop-out) regulators with 60dB PSRR (power supply rejection ratio) at 100kHz. ADI has introduced fixed and adjustable versions of the LDO, but right now I don’t see a negative LDO like TI released. The TI parts had a PSRR of about 53dB at 100kHz, depending on output capacitance you use and other variables. From the ADI press release:

• Analog Devices (ADI) today introduced two low-quiescent-current LDOs (low-dropout linear regulators) that deliver outstanding supply-rejection. The new ADP124 and ADP125 LDOs have PSRR (power-supply-rejection ratio) performance of 60 dB at 100 kHz, and achieve low noise of 35 µVrms (micro-volts per root mean squared) 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 new LDOs also feature a low quiescent current of 210 μA and a 130 mV dropout voltage at a 500 mA load. An initial 1 percent accuracy provides tight tolerances for core voltage rails in FPGA applications.
• The ADP124 offers 31 fixed-output voltage options from 1.75 V to 3.3 V. The ADP125 LDO provides an adjustable output voltage between 0.8 V and 5.0 V using an external voltage divider. The ADP124 and ADP125 are specifically designed for stable operation with tiny 1 μF ceramic input and output capacitors. The LDOs are available in a compact 2 mm x 2 mm x 0.55 mm LFCSP package or an 8-lead exposed paddle MSOP package. Pricing is 42 cents in 1000s.
• Redykit Evaluation Kits are available to simplify product evaluation. The kits contain evaluation boards and additional devices with other voltage options. In addition, a linear regulator tool can be downloaded from the ADIsimPower Resources and Tools for Power Management tab on ADI’s power management website. The tool generates a bill of materials with complete operating conditions to finish the full circuit design.