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3A LDO can be paralleled for heat spreading

Posted: 11 Feb 2011 ?? ?Print Version ?Bookmark and Share

Keywords:3A LDO regulator? heat spreading? output current?

Linear Technology Corp. announces the LT3083, a 3A LDO that can be paralleled for heat spreading and higher output current, and is adjustable with a single resistor.

The regulator is based on the same architecture as its 1.1A predecessor, the LT3080, which uses a current source reference for single resistor output voltage setting. With the SET pins tied together, sharing the current and spreading the heat is accomplished between multiple regulators using a small length of PC trace as ballast, enabling multiamp linear regulation in all surface-mount systems without heat sinks.

The LT3083 achieves regulation of under 2mV at any output voltage. Featuring an input voltage range from 1.2V to 18V (DD-Pak and TO-220 packages), the regulator's full current dropout is only 310mV (when operating with a separate bias supply). The output voltage is programmable with a single resistor from 0V to 17.5V, and the on-chip trimmed 50?A current reference is trimmed to 1 percent. The regulation and output noise (40?Vrms) is independent of output voltage due to the device's voltage follower architecture. The high output current, wide VIN & VOUT capability, tight line and load regulation, high ripple rejection, low external parts count and paralleling capability make the LT3083 suitable for modern higher-current, multirail systems.

The LT3083 is offered in a variety of thermally enhanced surface-mount compatible packages, including a low profile (0.75mm) 12-lead 4mm x 4mm DFN and a 16-lead thermally enhanced TSSOP; both dissipate 2W in surface mount applications with no heat sink. The LT3083 is also available in 5-lead TO-220 and DD-Pak power packages for mounting to heat sinks for higher power dissipation.


Figure 1: The LT3083 achieves regulation of under 2mV at any output voltage.

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