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LTC3619BEDD-PBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC3619BEDD-PBF Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  LTC3619B 3619bfa VFB1(Pin1/Pin1):Regulator1OutputFeedback.Receives the feedback voltage from the external resistive divider across the regulator 1 output. Nominal voltage for this pin is 0.6V. RUN1 (Pin 2/Pin 2): Regulator 1 Enable. Forcing this pin to VIN enables regulator 1, while forcing it to GND causes regulator 1 to shut down. RLIM (Pin 3/Pin 3): Average Input Current Limit Program Pin. Place a resistor and capacitor in parallel from this pin to ground. PGOOD1(Pin4/Pin4):Open-DrainLogicOutput.PGOOD1 is pulled to ground if the voltage on the VFB1 pin is not within power good threshold. SW1 (Pin 5/Pin 5): Regulator 1 Switch Node Connection to the Inductor. This pin swings from VIN to GND. VIN (Pin 6/Pin 6): Main Power Supply. Must be closely de-coupled to GND. SW2 (Pin 7/Pin 7): Regulator 2 Switch Node Connection to the Inductor. This pin swings from VIN to GND. PGOOD2(Pin8/Pin8):Open-DrainLogicOutput.PGOOD2 is pulled to ground if the voltage on the VFB2 pin is not within power good threshold. RUN2 (Pin 9/Pin 9): Regulator 2 Enable. Forcing this pin to VIN enables regulator 2, while forcing it to GND causes regulator 2 to shut down. VFB2 (Pin 10/Pin 10): Regulator 2 Output Feedback. Receives the feedback voltage from the external resistive divider across the regulator 2 output. Nominal voltage for this pin is 0.6V. GND (Pin 11/Pin 11): Ground. Bottom Exposed Pad. Con- nect to the (–) terminal of COUT, and the (–) terminal of CIN. The Exposed Pad must be soldered to PCB. pin FuncTions Typical perForMance characTerisTics T A = 25°C, VIN = 5V, unless otherwise noted. (DD/MSE) Average Input Current Limit vs Temperature Load Step Load Step TEMPERATURE (°C) –50 –8 –4 –2 –6 0 6 4 2 8 75 100 50 25 0 –25 3619B G19 125 VIN = 5V ILIM = 475mA VIN = 5V, VOUT = 3.3V ILOAD = 0A TO 400mA CL = 4.7µF 20µs/DIV 3619B G20 ILOAD 500mA/DIV IL 500mA/DIV VOUT 200mV/DIV AC-COUPLED VIN = 5V, VOUT = 1.8V ILOAD = 40mA TO 400mA CL = 4.7µF 20µs/DIV 3619B G21 ILOAD 500mA/DIV IL 500mA/DIV VOUT 200mV/DIV AC-COUPLED |
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