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LT3483 Datasheet(PDF) 5 Page - Linear Technology |
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LT3483 Datasheet(HTML) 5 Page - Linear Technology |
5 / 12 page LT3483 5 3483fb PIN FUNCTIONS FB (Pin 1/Pin 3): Feedback. Place resistor to negative output here. Set resistor value R1 = VOUT/10μA. GND (Pins 2, 3/Pin 2): Ground. For DFN package, tie both pin 2 and pin 3 together to ground. SW (Pin 4/Pin 1): Switch. Connect to external inductor L1 and positive terminal of transfer capacitor. VIN (Pin 5/Pin 6): Input Supply. Must be locally bypassed with 1μF or greater. NC (Pin 6/NA): No Connection. D (Pin 7/Pin 5): Anode Terminal of Integrated Schottky Diode. Connect to negative terminal of transfer capaci- tor and external inductor L2 (flyback configuration) or to cathode of external Schottky diode (inverting charge pump configuration). SHDN (Pin 8/Pin 4): Shutdown. Connect to GND to turn device off. Connect to supply to turn device on. Exposed Pad (Pin 9/NA): GND. The exposed pad should be soldered to the PCB ground to achieve the rated thermal performance. (DFN/TSOT-23) BLOCK DIAGRAM – + – + 6 3 1 2 5 A3 300ns DELAY 1.250V REFERENCE S Q1 20mV SW D L1B L1A CFLY COUT VOUT 0.1Ω 0.1Ω GND 3483 BD – + 25mV D1 Q RQ A1 A2 125k R1 R2 VOUT D D2 VIN VIN FB OPTIONAL CHARGE PUMP CONFIGURATION. L1B REPLACED WITH: PIN NUMBERS CORRESPOND TO THE 6-PIN TSOT-23 PACKAGE VOUT •• |
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