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LT3493EDCB-TRPBF Datasheet(PDF) 6 Page - Linear Technology |
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LT3493EDCB-TRPBF Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  LT3493 6 3493fb BLOCK DIAGRAM PIN FUNCTIONS FB (Pin 1): The LT3493 regulates its feedback pin to 780mV. Connect the feedback resistor divider tap to this pin. Set the output voltage according to VOUT = 0.78V • (1 + R1/R2). A good value for R2 is 10k. GND (Pin 2): Tie the GND pin to a local ground plane below the LT3493 and the circuit components. Return the feedback divider to this pin. BOOST (Pin 3): The BOOST pin is used to provide a drive voltage, higher than the input voltage, to the internal bipolar NPN power switch. SW (Pin 4): The SW pin is the output of the internal power switch. Connect this pin to the inductor, catch diode and boost capacitor. VIN (Pin 5): The VIN pin supplies current to the LT3493’s internal regulator and to the internal power switch. This pin must be locally bypassed. SHDN (Pin 6): The SHDN pin is used to put the LT3493 in shutdown mode. Tie to ground to shut down the LT3493. Tie to 2.3V or more for normal operation. If the shutdown feature is not used, tie this pin to the VIN pin. SHDN also provides a soft-start function; see the Applications Infor- mation section. Exposed Pad (Pin 7): The Exposed Pad must be soldered to the PCB and electrically connected to ground. Use a large ground plane and thermal vias to optimize thermal performance. 1 R DRIVER Q1 S OSC SLOPE COMP FREQUENCY FOLDBACK INT REG AND UVLO VC gm 780mV 3493 BD 2 5 6 Q Q 3 4 BOOST SW FB R2 R1 VOUT L1 D2 C3 C1 D1 VIN C2 VIN ON OFF GND C4 R3 SHDN |
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