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LT3680 Datasheet(PDF) 7 Page - Linear Technology |
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LT3680 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 24 page  LT3680 7 3680fa BD (Pin 1): This pin connects to the anode of the boost Schottky diode. BD also supplies current to the internal regulator. BOOST (Pin 2): This pin is used to provide a drive voltage, higher than the input voltage, to the internal bipolar NPN power switch. 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. VIN (Pin 4): The VIN pin supplies current to the LT3680’s internal regulator and to the internal power switch. This pin must be locally bypassed. RUN/SS (Pin 5): The RUN/SS pin is used to put the LT3680 in shutdown mode. Tie to ground to shut down the LT3680. Tie to 2.5V or more for normal operation. If the shutdown feature is not used, tie this pin to the VIN pin. RUN/SS also provides a soft-start function; see the Applications Information section. SYNC (Pin 6): This is the external clock synchronization input. Ground this pin for low ripple Burst Mode operation at low output loads. Tie to a clock source for synchroniza- tion. Clock edges should have rise and fall times faster than 1μs. Do not leave pin floating. See synchronizing section in Applications Information. PG (Pin 7): The PG pin is the open collector output of an internal comparator. PG remains low until the FB pin is within 9% of the final regulation voltage. PG output is valid when VIN is above 3.6V and RUN/SS is high. FB (Pin 8): The LT3680 regulates the FB pin to 0.790V. Connect the feedback resistor divider tap to this pin. VC (Pin 9): The VC pin is the output of the internal error amplifier. The voltage on this pin controls the peak switch current. Tie an RC network from this pin to ground to compensate the control loop. RT (Pin 10): Oscillator Resistor Input. Connecting a resistor to ground from this pin sets the switching frequency. Exposed Pad (Pin 11): Ground. The Exposed Pad must be soldered to PCB. + – + – OSCILLATOR 200kHzTO2.4MHz BurstMode DETECT VC CLAMP SOFT-START SLOPE COMP R VIN VIN RUN/SS BOOST SW SWITCH LATCH VC VOUT C2 C3 CF L1 D1 DISABLE CC RC BD RT R2 GND ERROR AMP R1 FB RT C1 PG 0.7V S Q 3680 BD 4 5 10 7 1 2 3 9 11 8 6 INTERNAL 0.79V REF SYNC BLOCK DIAGRAM PIN FUNCTIONS |
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