A family of high-performance low-dropout (LDO) regulators from Analog Devices Inc. generates low-noise, low-voltage supply rails while extending battery life in portable devices. The ADP120, ADP121, and ADP130 LDOs provide clean power to noise-sensitive mixed-signal ICs with supply currents below 350 mA, while consuming only 11 μA to 24 μA of quiescent current and operating at voltages as low as 1.2 V. All three devices are stable with a very small 1-μF ceramic output capacitor, eliminating the need for additional bypass capacitors.

Article Tools

• 

The ADP120 and ADP121 feature 60-dB power-supply rejection at 10 kHz, while achieving noise figures of 40 µV rms and consuming only 11 µA, making them well-suited to power RF and analog circuitry in portable applications. The ADP130 offers a unique dual-supply architecture that enables excellent low-dropout performance when compared to single-supply devices. Leveraging this architecture, the ADP130 can be biased from a higher input supply, while the load current is sourced from a lower input supply to reduce overall power dissipation and enable low-dropout operation.

The ADP120 and ADP121 feature a low 60-mV dropout voltage for 100 mA of load current. The ADP130 features an ultra-low 17-mV dropout voltage.

The ADP120, ADP121, and ADP130 LDOs are available now in production quantities. In a five-lead thin, small-outline transistor (TSOT) package, the ADP120 is $0.26, the ADP121 is $0.27, and the ADP130 is $0.33 in 1000-unit quantities. The ADP120 and ADP121 are also available in an ultra-small (0.86- by 0.86-mm) four-ball wafer-level chip scale package (WLCSP) option.

• Analog Devices Inc.
  www.analog.com