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LT3085IDCB-TR Datasheet(PDF) 7 Page - Linear Technology |
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LT3085IDCB-TR Datasheet(HTML) 7 Page - Linear Technology |
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7 / 28 page  LT3085 7 3085fb TYPICAL PERFORMANCE CHARACTERISTICS Error Amplifier Gain and Phase FREQUENCY (Hz) 10 9 15 21 100k 3085 G28 3 –3 6 12 18 0 –6 –9 –72 72 216 –216 –360 –144 0 144 –288 –432 –504 100 1k 10k 1M ILOAD = 500mA ILOAD = 100mA ILOAD = 100mA ILOAD = 500mA Ripple Rejection - SET Pin Current FREQUENCY (Hz) 0 60 150 10k 100k 100 10 1k 1M 3085 G29 30 90 120 45 135 15 75 105 CSET = 0.1μF CSET = 0 RSET = 100k VIN = VCONTROL = VOUT (NOMINAL) +2V RIPPLE = 50mVP–P PIN FUNCTIONS VCONTROL (Pin 4/Pin 5): This pin is the supply pin for the control circuitry of the device. The current flow into this pin is about 1.7% of the output current. For the device to regulate, this voltage must be more than 1.2V to 1.35V greater than the output voltage (see VCONTROL Dropout Voltage in the Electrical Characteristics table and graphs in the Typical Performance Characteristics). The LT3085 requires a bypass capacitor at VCONTROL if more than six inches away from the main input filter capacitor. The output impedance of a battery rises with frequency, so include a bypass capacitor in battery-powered circuits. A bypass capacitor in the range of 1μF to 10μF suffices. IN (Pins 5, 6/Pins 7, 8): This is the collector to the power device of the LT3085. The output load current is supplied through this pin. For the device to regulate, the voltage at this pin must be more than 0.1V to 0.5V greater than the output voltage (see VIN Dropout Voltage in the Electrical Characteristics table and graphs in the Typical Perfor- mance Characteristics). The LT3085 requires a bypass capacitor at IN if more than six inches away from the main input filter capacitor. The output impedance of a battery rises with frequency, so include a bypass capacitor in battery-powered circuits. A bypass capacitor in the range of 1μF to 10μF suffices. NC (NA/Pin 6): No Connection. The No Connect pin has no connection to internal circuitry and may be tied to VIN, VCONTROL, VOUT, GND, or floated. OUT (Pins 1, 2/Pins 1, 2, 3): This is the power output of the device. There must be a minimum load current of 1mA or the output may not regulate. A minimum 2.2μF output capacitor is required for stability. SET (Pin 3/Pin 4): This pin is the non-inverting input to the error amplifier and the regulation set point for the device. A fixed current of 10μA flows out of this pin through a single external resistor, which programs the output voltage of the device. Output voltage range is zero to the absolute maximum rated output voltage. Transient performance can be improved and output noise can be decreased by adding a small capacitor from the SET pin to ground. Exposed Pad (Pin 7/Pin 9): OUT. Tie directly to Pins 1, 2/ Pins 2, 3 directly at the PCB. (DCB/MS8E) |
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