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LTC3407AEDD-2-TRPBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC3407AEDD-2-TRPBF Datasheet(HTML) 6 Page - Linear Technology |
6 / 16 page LTC3407A-2 6 3407a2f 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. 1 2 9 10 8 3 4 11 5 – + – + – + – + EA UVDET OVDET 0.6V 7 0.65V 0.55V – + 0.65V UV OV ITH SWITCHING LOGIC AND BLANKING CIRCUIT S R Q Q RS LATCH BURST ICOMP IRCMP ANTI SHOOT- THRU BURST CLAMP SLOPE COMP EN SLEEP POR COUNTER 0.6V REF OSC OSC REGULATOR 2 (IDENTICAL TO REGULATOR 1) PGOOD1 PGOOD2 SHUTDOWN VIN VIN VIN 6 REGULATOR 1 SW1 GND POR GND SW2 3407A2 BD 5 Ω MODE/SYNC VFB1 RUN/SS1 RUN/SS2 VFB2 VFB1 (Pin 1): Output Feedback. Receives the feedback voltage 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. GND (Pin 5): Main Ground. Connect to the (–) terminal of COUT, and (–) terminal of CIN. MODE/SYNC (Pin 6): Combination Mode Selection and Oscillator Synchronization. This pin controls the operation of the device. When tied to VIN or GND, Burst Mode operation or pulse skipping mode is selected, respec- tively. Do not float this pin. The oscillation frequency can BLOCK DIAGRA PI FU CTIO S |
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