Analog Devices Inc. LT3080/LT3080-1 Single Resistor LDOs

Analog Devices Inc. LT3080/LT3080-1 1.1A Low Dropout (LDO) Linear Regulators incorporate an internal ballast resistor that allows direct paralleling of devices without the need for PC board trace resistors. Keeping the board layout simple and easy, the internal ballast resistor allows multiple devices to be paralleled directly on a surface mount board for higher output current and power dissipation. The device brings out the collector of the pass transistor to allow low dropout operation when used with multiple input supplies.

The Analog Devices Inc. LT3080/LT3080-1 is capable of supplying a wide output voltage range. By using a reference current through a single resistor, the output voltage is programmed to any level between zero and 36V. The LT3080/LT3080-1 is stable with 2.2µF of ceramic capacitance on the output, not requiring additional ESR as is common with other regulators. Internal protection circuitry includes current limiting and thermal limiting.

Features

Outputs may be paralleled for higher current and heat spreading
1.1A output current
Single resistor programs output voltage
1% initial accuracy of SET pin current
Output adjustable to 0V
40µV_RMS (10Hz to 100kHz) output noise
1.2V to 36V input voltage range
50mV (except SOT-223 package) dropout voltage

<1mV load regulation (LT3080 only)
<0.001%/ V line regulation
0.5mA minimum load current
Stable with 2.2µF minimum ceramic output capacitor
Current limit with foldback and overtemperature protected
Available in 8-lead MSOP, 3mm × 3mm DFN, 5-lead DD-Pak, TO-220, and 3-lead SOT-223