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LTC3548A Datasheet(PDF) 6 Page - Linear Technology |
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LTC3548A Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  LTC3548A 6 3548af PIN FUNCTIONS VFB1 (Pin 1): Output Feedback. Receives the feedback volt- age from the external resistive divider across the output. Nominal voltage for this pin is 0.6V. RUN/SS1 (Pin 2): Regulator 1 Enable and Soft-Start Input. Forcing this pin to VIN enables regulator 1, while forcing it to GND causes regulator 1 to shut down. Connect external RC network with desired time-constant to enable soft-start feature. This pin must be driven; do not float. VIN (Pin 3): Main Power Supply. Must be closely decoupled to GND. SW1 (Pin 4): Regulator 1 Switch Node Connection to the Inductor. This pin swings from VIN to GND. NC (Pin 5): No Connect. This pin is not connected inter- nally. Connect to ground on PCB for shielding purposes. MODE/SYNC (Pin 6): Combination Mode Selection and Oscillator Synchronization. This pin controls the opera- tion of the device. When tied to VIN or GND, Burst Mode operation or pulse-skipping mode is selected, respectively. Do not float this pin. The oscillation frequency can be synchronized to an external oscillator applied to this pin and pulse-skipping mode is automatically selected. SW2 (Pin 7): Regulator 2 Switch Node Connection to the Inductor. This pin swings from VIN to GND. POR (Pin 8): Power-On Reset. This common-drain logic output is pulled to GND when the output voltage is not within ±8.5% of regulation and goes high after 216 clock cycles when both channels are within regulation. RUN/SS2 (Pin 9): Regulator 2 Enable and Soft-Start Input. Forcing this pin to VIN enables regulator 2, while forcing it to GND causes regulator 2 to shut down. Connect external RC network with desired time-constant to enable soft-start feature. This pin must be driven; do not float. VFB2 (Pin 10): Output Feedback. Receives the feedback voltage from the external resistive divider across the output. Nominal voltage for this pin is 0.6V. Exposed Pad (GND) (Pin 11): Power Ground. Connect to the (–) terminal of COUT, and (–) terminal of CIN. Must be soldered to electrical ground on PCB. |
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