LP3986BLX-2828 datasheet(11/13 Pages) NSC

Part #	LP3986BLX-2828

Description	Dual Micropower 150 mA Ultra Low-Dropout CMOS Voltage Regulators in micro SMD Package

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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11 / 13 page

Application Hints (Continued)

MICRO SMD MOUNTING

The micro SMD package requires specific mounting tech-

niques which are detailed in National Semiconductor Appli-

cation Note (AN-1112). Referring to the section Surface

Mount Technology (SMT) Assembly Considerations.

For best results during assembly, alignment ordinals on the

PC board may be used to facilitate placement of the micro

SMD device.

MICRO SMD LIGHT SENSITIVITY

Exposing the micro SMD device to direct sunlight will cause

misoperation of the device. Light sources such as halogen

lamps can effect electrical performance if brought near to the

device.

The wavelengths which have most detrimental effect are

reds and infra-reds, which means that the fluorescent light-

ing used inside most buildings has very little effect on per-

formance. A micro SMD test board was brought to within

1cm of a fluorescent desk lamp and the effect on the regu-

lated output voltage was negligible, showing a deviation of

less than 0.1% from nominal.

www.national.com

11

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