Milpitas, Calif. Linear Technology Corp. has introduced its 500-mA LT3085 low dropout regulator (LDO) that can be easily paralleled for heat spreading. It's also adjustable down to “0” volts with a single resistor. This new architecture regulator uses a current reference rather than a conventional voltage reference to allow sharing between multiple regulators by directly paralleling the pins. Current sharing is set with a small length of PC trace as ballast, enabling multi-amp linear regulation in all surface-mount systems without heat sinks.
Featuring a 500-mA output current and wide input voltage capability from 1.2 V to 36 V, the LT3085 features a low dropout voltage of only 275 mV at full load. The output voltage is adjustable, spanning a wide range from 0 V to 35 V, and the on-chip trimmed current reference achieves an accuracy of ±1%. The wide VIN and VOUT capability, low external parts count and parallel capability make it suitable for modern multi-rail systems. Output voltage noise is a 33 uVrms over a wide bandwidth of 10 Hz to 100 kHz. Protection features include current limiting with foldback and thermal limiting.
The LT3085 is offered in two high-power-density packages: the low-profile (0.75 mm) 6-lead DFN (2 x 3-mm) and 8-pin thermally enhanced MSOP. These packages can dissipate 1-W to 2-W in surface-mount applications without a heat sink. The LT3085E and LT3085I feature an operating junction temperature of -40°C to +125°C, while the LT3085MP (MSOP package only) features operation down to -55°C junction temperature.
Pricing: Starts at $1.73 and $1.90 for the DFN package in E and I grades respectively, and $1.83, $2.00 and $4.94 for the MSOP package E, I and MP grades, respectively, in quantities of 1,000.
Product information: LT3085
Linear Technology , www.linear.com