LT3080 TYPICAL PERFORMANCE CHARACTERISTICSOutput Voltage NoiseError Amplifier Gain and Phase 20 300 15 250 V 10 200 OUT 100µV/DIV I PHASE (DEGREES) 5 L = 1.1A 150 0 100 –5 IL = 100mA 50 TIME 1ms/DIV 3080 G27 VOUT = 1V I R GAIN (dB) –10 L = 1.1A 0 SET = 100k CSET = O.1µF –15 –50 COUT = 10µF IL = 100mA ILOAD = 1.1A –20 –100 –25 –150 –30 –200 10 100 1k 10k 100k 1M FREQUENCY (Hz) 3080 G28 PIN FUNCTIONS (DD/MS8E/Q/T/ST)VCONTROL (Pin 5/Pin 5/Pin 4/Pin 4/NA): This pin is the OUT (Pins 1-3/Pins 1-3/Pin 3/Pin 3/Pin 2): This is the supply pin for the control circuitry of the device. The power output of the device. There must be a minimum current flow into this pin is about 1.7% of the output load current of 1mA or the output may not regulate. current. For the device to regulate, this voltage must be SET (Pin 4/Pin 4/Pin 2/Pin 2/Pin 1): This pin is the input more than 1.2V to 1.35V greater than the output voltage to the error amplifier and the regulation set point for (see dropout specifications). the device. A fixed current of 10µA flows out of this pin IN (Pins 7, 8/Pins 7, 8/Pin 5/Pin 5/Pin 3): This is the through a single external resistor, which programs the collector to the power device of the LT3080. The out- output voltage of the device. Output voltage range is zero put load current is supplied through this pin. For the to the absolute maximum rated output voltage. Transient device to regulate, the voltage at this pin must be more performance can be improved by adding a small capacitor than 0.1V to 0.5V greater than the output voltage (see from the SET pin to ground. dropout specifications). Exposed Pad (Pin 9/Pin 9/NA/NA/NA): OUT on MS8E and NC (Pin 6/Pin 6/Pin 1/Pin 1/NA): No Connection. No con- DFN packages. nect pins have no connection to internal circuitry and may TAB: OUT on DD-Pak, TO-220 and SOT-223 packages. be tied to VIN, VCONTROL, VOUT , GND or floated. Rev. D 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Output Voltage Stability and Output Capacitance Paralleling Devices Thermal Performance Quieting the Noise Overload Recovery Load Regulation Thermal Considerations T Package, 5-Lead TO-220 Calculating Junction Temperature Reducing Power Dissipation Typical Applications Package Description Revision History Typical Application Related Parts
