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LT1936EMS8E-TRPBF Datasheet(PDF) 6 Page - Linear Technology |
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LT1936EMS8E-TRPBF Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  LT1936 6 1936fd BLOCK DIAGRAM 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. VIN (Pin 2): The VIN pin supplies current to the LT1936’s internal regulator and to the internal power switch. This pin must be locally bypassed. SW (Pin 3): The SW pin is the output of the internal power switch. Connect this pin to the inductor, catch diode and boost capacitor. GND (Pin 4): Tie the GND pin to a local ground plane below the LT1936 and the circuit components. Return the feedback divider to this pin. SHDN (Pin 5): The SHDN pin is used to put the LT1936 in shutdown mode. Tie to ground to shut down the LT1936. 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. Do not drive SHDN more than 5V above VIN. FB (Pin 6): The LT1936 regulates its feedback pin to 1.200V. Connect the feedback resistor divider tap to this pin. Set the output voltage according to VOUT = 1.200V (1 + R1/R2). A good value for R2 is 10k. VC (Pin 7): The VC pin is used to compensate the LT1936 control loop by tying an external RC network from this pin to ground. The COMP pin provides access to an internal RC network that can be used instead of the external components. COMP (Pin 8): To use the internal compensation network, tie the COMP pin to the VC pin. Otherwise, tie COMP to ground or leave it floating. Exposed Pad (Pin 9): 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. 4 ∑ R DRIVER Q1 S OSC SLOPE COMP FREQUENCY FOLDBACK INT REG AND UVLO VC gm 1.200V 1936 BD 8 2 5 Q Q 1 3 BOOST SW 6 FB GND RC 50k CC 150pF VOUT R1 R2 L1 D2 C3 C1 D1 VIN C2 VIN ON OFF COMP 7 VC R4 C5 C4 R3 SHDN |
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