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LT3020EDD-1.5 Datasheet(PDF) 8 Page - Linear Technology |
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LT3020EDD-1.5 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 16 page  8 LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 sn3020 3020fas PI FU CTIO S OUT (Pins 1, 2): These pins supply power to the load. Use a minimum output capacitor of 2.2µFtopreventoscillations. Applications with large load transients require larger out- put capacitors to limit peak voltage transients. See the Applications Information section for more information on output capacitance and reverse output characteristics. OUT (Pin 3, Fixed Voltage Device Only): This pin is the sense point for the internal resistor divider. It should be tied directly to the other OUT pins (1, 2) for best results. ADJ (Pin 3, Adjustable Device Only): This pin is the inverting terminal to the error amplifier. Its typical input bias current of 20nA flows out of the pin (see curve of ADJ Pin Bias Current vs Temperature in the Typical Perfor- mance Characteristics). The ADJ pin reference voltage is 200mV (referred to GND). GND (Pin 4): Ground. SHDN (Pin 5): The SHDN pin puts the LT3020 into a low power state. Pulling the SHDN pin low turns the output off. Drive the SHDN pin with either logic or an open collector/ drain device with a pull-up resistor. The pull-up resistor supplies the pull-up current to the open collector/drain logic, normally several microamperes, and the SHDN pin current, typically 2.3µA. If unused, connect the SHDN pin to VIN. The LT3020 does not function if the SHDN pin is not connected. IN (Pins 7, 8): These pins supply power to the device. The LT3020 requires a bypass capacitor at IN if it is 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 2.2µF to 10µF suffices. The LT3020 withstands reverse voltages on the IN pin with respect to ground and the OUT pin. In the case of a reversed input, which occurs if a battery is plugged in backwards, the LT3020 acts as if a diode is in series with its input. No reverse current flows into the LT3020 and no reverse volt- age appears at the load. The device protects itself and the load. GND (Pin 9, DD8 Package Only): Ground. Solder Pin 9 (the exposed pad) to the PCB. Connect directly to Pin 4 for best performance. BLOCK DIAGRA SHUTDOWN – + CURRENT GAIN THERMAL SHUTDOWN R3 R2 R1 3020 BD D1 Q1 D2 Q2 ERROR AMP NO-LOAD RECOVERY Q3 IN (7, 8) OUT (1, 2) OUT SENSE (3) NOTE: FOR LT3020 ADJUST PIN 3 IS CONNECTED TO THE ADJUST PIN, R1 AND R2 ARE EXTERNAL. FOR LT3020-1.X PIN 3 IS CONNECTED TO THE OUTPUT SENSE PIN, R1 AND R2 ARE INTERNAL. GND (4,9) ADJ (3) 25k SHDN (5) 200mV 212mV BIAS CURRENT AND REFERENCE GENERATOR FIXED VOUT 1.2V 1.5V 1.8V R1 20k 20k 20k R2 100k 130k 160k |
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