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Low Dropout Regulator

Fri, 04/06/2001 - 5:21am
A new low dropout regulator that prolongs battery life and simplifies dc-to-dc converter designs was announced today by Siliconix incorporated. The latest in the Vishay Siliconix linear regulator series, the new Si9181DQ supplies power to the signal processing circuitry in cellular phones, PDAs, notebook computers, and other portable systems and features a maximum continuous output current of 350 mA.

With the lowest dropout rate in the industry for its output current — typically 150 mV — the Si9181DQ promotes longer run times and talk times, since the input and output voltage differential is minimized. An ultra-low no load ground current of 150 μ A typical further conserves battery life, allowing manufacturers to add more features or to utilize smaller batteries for their designs.

The Si9181DQ features a ripple rejection ratio of 60 dB, when measured at 10 kHz and at 150 mA of output current, and allows an input voltage range between 2.0 V and 6.0 V. An out-of-regulation error flag that is activated when the output voltage falls to 5% below its nominal output voltage is also integrated. The Si9181DQ is available in output voltage options of 1.5 V, 1.8 V, 2.0 V, 2.5 V, 2.8 V, 3.0 V, 3.3 V and 5.0 V, and is also offered in an adjustable version that features all eight output voltage options, making it a versatile component for a wide variety of applications.

The Si9181DQ reacts quickly to variations in both input and output levels, featuring the fastest transient response in the industry — typically less than 2 μ s for all output voltages. This rapid response rate allows the Si9181DQ to be used along with DSPs or microcontrollers that feature extremely fast slew rates.

Today's market requires longer talk and run times, packaged in a feature-loaded, streamlined device. The low dropout voltage and fast transient response of the Si9181DQ regulator allow manufacturers to design portable devices that better meet these requirements with longer battery life and better battery performance.

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