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LTC3813EG Datasheet(PDF) 9 Page - Linear Technology |
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LTC3813EG Datasheet(HTML) 9 Page - Linear Technology |
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9 / 32 page  LTC3813 9 3813fb BG (Pin 19): Bottom Gate Drive. The BG pin drives the gate of the bottom N-channel main switch MOSFET. This pin swings from BGRTN to DRVCC. BGRTN (Pin 20): Bottom Gate Return. This pin connects to the source of the pulldown MOSFET in the BG driver and is normally connected to ground. Connecting a negative supply to this pin allows the main MOSFET’s gate to be pulled below ground to help prevent false turn-on during high dV/dt transitions on the SW node. See the Applica- tions Information section for more details. SENSE+, SENSE– (Pin 25, Pin 21): Current Sense Com- parator Input. The (+) input to the current comparator is normally connected to SW unless using a sense resistor. The (–) input is used to accurately kelvin sense the bottom side of the sense resistor or MOSFET. SW (Pin 26): Switch Node Connection to Inductor and Bootstrap Capacitor. Voltage swing at this pin is from a Schottky diode (external) voltage drop below ground to VOUT. TG (Pin 27): Top Gate Drive. The TG pin drives the gate of the top N-channel synchronous switch MOSFET. The TG driver draws power from the BOOST pin and returns to the SW pin, providing true floating drive to the top MOSFET. BOOST (Pin 28): Top Gate Driver Supply. The BOOST pin supplies power to the floating TG driver. BOOST should be bypassed to SW with a low ESR (X5R or better) 0.1μF capacitor. An additional fast recovery Schottky diode from DRVCC to the BOOST pin will create a complete floating charge-pumped supply at BOOST. PIN FUNCTIONS |
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