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LTC3809EDD-1-PBF Datasheet(PDF) 7 Page - Linear Technology |
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LTC3809EDD-1-PBF Datasheet(HTML) 7 Page - Linear Technology |
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7 / 24 page  LTC3809-1 7 38091fc PIN FUNCTIONS MODE (Pin 1): This pin performs two functions: 1) auxiliary winding feedback input, and 2) Burst Mode operation, pulse skipping or forced continuous mode select. To select Burst Mode operation at light loads, tie this pin to VIN. Grounding this pin selects forced continuous operation which allows the inductor current to reverse. Tying this pin to VFB selects pulse-skipping mode. Do not leave this pin floating. TRACK/SS (Pin 2): Tracking Input for the Controller or Optional External Soft-Start Input. This pin allows the start-up of VOUT to “track” the external voltage at this pin using an external resistor divider. Tying this pin to VIN allows VOUT to start up with the internal 0.74ms soft-start. An external soft-start can be programmed by connecting a capacitor between this pin and ground. Do not leave this pin floating. VFB (Pin 3): Feedback Pin. This pin receives the remotely sensed feedback voltage for the controller from an external resistor divider across the output. ITH (Pin 4): Current Threshold and Error Amplifier Compensation Point. Nominal operating range on this pin is from 0.7V to 2V. The voltage on this pin determines the threshold of the main current comparator. RUN (Pin 5): Run Control Input. Forcing this pin below 1.1V shuts down the chip. Driving this pin to VIN or releasing this pin enables the chip to start-up with the internal soft-start. IPRG (Pin 6): Three-State Pin to Select Maximum Peak Sense Voltage Threshold. This pin selects the maximum allowed voltage drop between the VIN and SW pins (i.e., the maximum allowed drop across the external P-channel MOSFET). Tie to VIN, GND or float to select 204mV, 85mV or 125mV respectively. BG (Pin 7): Bottom (NMOS) Gate Drive Output. This pin drives the gate of the external N-channel MOSFET. This pin has an output swing from PGND to VIN. TG (Pin 8): Top (PMOS) Gate Drive Output. This pin drives the gate of the external P-channel MOSFET. This pin has an output swing from PGND to VIN. VIN (Pin 9): Chip Signal Power Supply. This pin powers the entire chip, the gate drivers and serves as the positive input to the differential current comparator. SW (Pin 10): Switch Node Connection to Inductor. This pin is also the negative input to the differential current comparator and an input to the reverse current comparator. Normally this pin is connected to the drain of the external P-channel MOSFET, the drain of the external N-channel MOSFET and the inductor. GND (Exposed Pad, Pin 11): Ground connection for internal circuits, the gate drivers and the negative input to the reverse current comparator. The Exposed Pad must be soldered to the PCB ground. |
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Similar Description - LTC3809EDD-1-PBF |
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