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Surface Mount 3A LDO is Easily Paralleled for High IOUT without Any Hot Spots

8th February 2011

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Linear Technology announces the LT3083, a 3A LDO that can be paralleled for heat spreading and higher output current, and is adjustable with a single resistor. This regulator is based on the same innovative 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 multi-amp linear regulation in all surface-mount systems without heat sinks.

/> The LT3083 achieves unmatched regulation of under 2mV at any output voltage. Featuring wide input voltage range from 1.2V to 18V (DD-Pak and TO-220 packages), the 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 50µA current reference is trimmed to ±1%. The regulation and output noise (40µVrms) 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 ideal for modern higher-current, multi-rail systems.

According to Robert Dobkin, Linear Technology’s Vice President, Engineering and CTO, “The LT3083 regulator provides designers with an all-surface-mount solution for high current, low ripple applications such as FPGAs, data communications or serial links. The device’s separate collector pin minimizes power dissipation when generating additional voltages in multi-rail power systems.”

Summary of Features: LT3083

* Outputs May be Paralleled for Higher Output Current or Spreading PCB Heat
* Output Current: 3A
* Single-Resistor Programs Output Voltage
* ±1% Accurate 50µA SET Pin Current
* Wide VIN Range: 1.2V to 18V (DD-Pak and TO-220 Packages)
* Adjustable VOUT Range: 0V to 17.5V
* Low Noise: 40µVRMS (10Hz to 100kHz)
* Low Dropout Voltage: 310mV
* <1mV Load Regulation
* <0.001%/V Line Regulation
* Stable with Minimum 10uF Ceramic Capacitor
* Current Limit with Foldback & OverTemperature Protected
* Available in 16-Lead TSSOP, 12-Lead 4mm x 4mm DFN, 5-Lead TO-220 & 5-Lead Surface Mount DD-PAK Packages