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LT1612 Datasheet(PDF) 5 Page - Linear Technology |
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LT1612 Datasheet(HTML) 5 Page - Linear Technology |
5 / 12 page 5 LT1612 sn1612 1612fs VC (Pin 1): Compensation Pin. This is the current sink/ source output of the error amplifier. By connecting an RC network from this pin to ground, frequency response can be tuned for a wide range of circuit configurations. The voltage at this pin also sets the current limit, and if grounded, the switch will remain in the OFF state. FB (Pin 2): Feedback Pin. This pin is the negative input to the error amplifier. Connect the resistor divider tap to this point which sets VOUT according to: VOUT = 0.62V (1 + R1/R2) VIN (Pin 3): Supply Pin. Bypass capacitor C1 must be right next to this pin. GND (Pin 4): Ground Pin. Connect directly to local ground plane. PIN FUNCTIONS SW (Pin 5): Switch Pin. Connect inductor and boost capacitor here. Minimize trace area at this pin to keep EMI down. BOOST (Pin 6): This is the supply pin for the switch driver and must be above VIN by 1.5V for proper switch opera- tion. Connect the boost capacitor to this pin. MODE (Pin 7): Burst Mode Operation Disable Pin. For continuous switching operation (low noise), pull this pin above 2V. For Burst Mode operation which gives better light load efficiency, tie to ground. Output ripple voltage in Burst Mode operation is typically 30mVP-P. See applica- tions section for more information about this function. SHDN (Pin 8): Shutdown Pin. Pull this pin low for shut- down mode. Tie to a voltage between 2V and 5.5V for normal operation. BLOCK DIAGRA – + RSENSE 0.08 Ω A1 V/I SLOPE COMPENSATION SWITCH SW GND 1612 BD BOOST A3 ENABLE – + A2 0.62V 0.7V BOOST DIODE SWITCH DRIVER VIN VC FB RECTIFIER RECTIFIER DRIVE 3 1 2 5 4 6 MODE 7 8 SHDN SHUTDOWN OSCILLATOR RQ S FLIP-FLOP |
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