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Ease start-up with LDOs

Posted: 12 Dec 2008     Print Version  Bookmark and Share

Keywords:LDO  LP38851  UVLO 

Typical low-dropout (LDO) linear voltage regulators do not provide a method of limiting the in-rush current during start up conditions. Using the LP38851, LP38852, and LP38853 adjustable LDO linear regulators, with nominal current levels of 800mA, 1.5A, and 3A, respectively, will eliminate this problem by including user-programmable, soft-start circuitry with the device.

When power is first applied to a linear LDO regulator, a finite setting of time is needed for the internal circuitry, including the band-gap reference voltage, to stabilise. This internal electrical uncertainty can be addressed by the use of Under-Voltage Lock-Out (UVLO) circuitry and an external enable logic control.

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