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LT1933ES6-PBF Datasheet(PDF) 6 Page - Linear Technology |
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LT1933ES6-PBF Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  LT1933 6 1933fd PIN FUNCTIONS BOOST (Pin 1): The BOOST pin is used to provide a drive voltage, higher than the input voltage, to the internal bipolar NPN power switch. GND (Pin 2/Pin 5 and Exposed Pad, Pin 7): Tie the GND pin to a local ground plane below the LT1933 and the circuit components. Return the feedback divider to this pin. FB (Pin 3/Pin 6): The LT1933 regulates its feedback pin to 1.245V. Connect the feedback resistor divider tap to this pin. Set the output voltage according to VOUT = 1.245V (1 + R1/R2). A good value for R2 is 10k. SHDN (Pin 4): The SHDN pin is used to put the LT1933 in shutdown mode. Tie to ground to shut down the LT1933. 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. VIN (Pin 5/Pin 2): The VIN pin supplies current to the LT1933’s internal regulator and to the internal power switch. This pin must be locally bypassed. SW (Pin 6): The SW pin is the output of the internal power switch. Connect this pin to the inductor, catch diode and boost capacitor. (SOT-23/DFN) BLOCK DIAGRAM Σ R DRIVER Q1 S OSC SLOPE COMP FREQUENCY FOLDBACK INT REG AND UVLO VC gm 1.245V 1933 BD Q Q BOOST SW FB R2 R1 VOUT L1 D2 C3 C1 D1 VIN C2 VIN ON OFF GND C4 R3 SHDN |
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