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LTC3547B Datasheet(PDF) 6 Page - Linear Technology |
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LTC3547B Datasheet(HTML) 6 Page - Linear Technology |
6 / 16 page LTC3547B 6 3547bfb PI FU CTIO S VFB1 (Pin 1): Regulator 1 Output Feedback. Receives the feedback voltage from the external resistor divider across the regulator 1 output. Nominal voltage for this pin is 0.6V. RUN1 (Pin 2): Regulator 1 Enable. Forcing this pin to VIN enables regulator 1, while forcing it to GND causes regulator 1 to shut down. VIN (Pin 3): Main Power Supply. Must be closely decou- pled to GND. SW1 (Pin 4): Regulator 1 Switch Node Connection to the Inductor. This pin swings from VIN to GND. GND (Pin 5): Ground. Connect to the (–) terminal of COUT, and the (–) terminal of CIN. SW2 (Pin 6): Regulator 2 Switch Node Connection to the Inductor. This pin swings from VIN to GND. RUN2 (Pin 7): Regulator 2 Enable. Forcing this pin to VIN enables regulator 2, while forcing it to GND causes regulator 2 to shut down. VFB2 (Pin 8): Regulator 2 Output Feedback. Receives the feedback voltage from the external resistor divider across the regulator 2 output. Nominal voltage for this pin is 0.6V. Exposed Pad (Pin 9): Electrically Connected to GND. Must be soldered to the PCB for optimum thermal performance. – + – + EA – + VSLEEP ITH SWITCHING LOGIC AND BLANKING CIRCUIT S R Q Q RS LATCH PULSE SKIP ICOMP IRCMP ANTI SHOOT- THRU SLOPE COMP SLEEP 0.6V REF OSC OSC REGULATOR 2 (IDENTICAL TO REGULATOR 1) SHUTDOWN REGULATOR 1 SW1 SW2 5Ω 3547 FD 1 2 7 8 RUN1 RUN2 VFB2 VFB1 4 VIN 3 GND 5 6 0.6V SOFT-START FUNCTIONAL DIAGRAM |
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