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Vishay LDO regulators tout 130mV dropout voltage

Posted: 02 Jan 2002 ?? ?Print Version ?Bookmark and Share

Keywords:vishay? vishay siliconix? siliconix? vishay intertechnology? si91841?

The Siliconix Si91841 and Si91843 150mA low-noise LDO regulators are designed for use in battery-powered equipment such as cell phones, wireless handsets and modems, PDAs, notebooks, pagers and digital cameras.

They feature a low ground current of only 1105A at 150mA, and a very low dropout voltage of only 130mV. The ultra-low noise output provides a quiet voltage source, while an external noise bypass capacitor further reduces noise levels for RF systems and other applications requiring low output noise down to 305Vrms.

Designed to maintain regulation while delivering 300mA peak output current in applications with high surge currents at turn-on, the devices are offered in 14 fixed-output voltage options ranging from 1.8V to 5V. Both feature 1.5 percent guaranteed output voltage accuracy, a fast start-up time of 505s, and fast transient response of <305s. A built-in active pull-down clamp circuit improves transient response and regulation.

The Si91841 discharges the output during shutdown mode through a 100-ohm n-channel MOSFET, while the Si91843 maintains an open circuit on the output.

Integrated short-circuit and thermal protection ensure reliable operation. Reverse battery protection limits reverse current flow to a 15A maximum shutdown current.

Housed in a 5-pin SOT23, the regulators may be used with low-ESR ceramic capacitors or tantalum capacitors.

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