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LDO regulators ready for noise-sensitive portable apps

Posted: 01 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:LDO regulator? portable applications? noise?

Analog Devices Inc. (ADI) introduces a family of high-performance LDO regulators that generates the low noise, low voltage supply rails and extended battery life required for mobile handsets and other battery-powered devices. The ADP120 and ADP121 LDOs are available in the industry's smallest wafer-level chip scale package (WLCSP), as well as a standard TSOT option, offering design flexibility for high-performance, small form factor handsets, claims ADI.

The new devices are part of a family of low-noise LDOs that provide clean power to noise-sensitive mixed-signal ICs with supply currents below 350mA, while consuming only 11?A to 24?A of quiescent current (Iq) and operating at output voltages as low as 1.2V. All three devices are stable with a very small 1?F ceramic output capacitor, eliminating the need for additional bypass capacitors. This reduces the amount of board space required as well as the bill-of-materials cost, says ADI. The combination of signal integrity and low-power operation allows designers of lithium-battery-powered devices, such as portable audio players, digital still cameras, handheld games and personal navigation systems, to quickly and cost-effectively resolve noise issues associated with dc power management. The very low Iq, along with a shutdown current in the nanoampere range, helps to reduce parasitic drain on the battery when the application is turned off, expanding the power budget to extend battery life or allow operation of other system functions.

The ADP120 and ADP121 feature 60dB power supply rejection at 10kHz, while achieving noise figures of 40?V rms and consuming only 11?A , making them ideal to power RF and analog circuitry in portable applications, says ADI. In addition, 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 LDOs feature a low 60mV dropout voltage for 100mA of load current. The ADP130 features an ultralow 17mV dropout voltage, making it ideal for generating low output voltages for small geometry digital cores and processors used in devices such as camera modules.

The ADP120, ADP121 and ADP130 LDOs are available now in production quantities. In a five-lead thin, small-outline transistor package, the ADP120 is $0.26, the ADP121 is $0.27 and the ADP130 is $0.33 in 1,000-unit quantities. The new ADP120 and ADP121 LDOs are also available in an ultrasmall, 0.86mm x 0.86mm four-ball WLCSP option.

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