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LTC3719 Datasheet(PDF) 9 Page - Linear Technology |
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LTC3719 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 32 page  9 LTC3719 sn3719 3719fs PI FU CTIO S SW2, SW1 (Pins 25, 34): Switch Node Connections to Inductors. Voltage swing at these pins is from a Schottky diode (external) voltage drop below ground to VIN. BOOST2, BOOST1 (Pins 26, 33): Bootstrapped Supplies to the Topside Floating Drivers. External capacitors are con- nected between the BOOST and SW pins, and Schottky diodes are connected between the BOOST and INTVCC pins. BG2, BG1 (Pins 27, 31): High Current Gate Drives for Bottom N-Channel MOSFETS. Voltage swing at these pins is from ground to INTVCC. PGND (Pin 28): Driver Power Ground. Connect to sources of bottom N-channel MOSFETS and the (–) terminals of CIN. INTVCC (Pin 29): Output of the Internal 5V Linear Low Dropout Regulator and the EXTVCC Switch. The driver and control circuits are powered from this voltage source. Decouple to power ground with a 1 µF ceramic capacitor placed directly adjacent to the IC and minimum of 4.7 µF additional tantalum or other low ESR capacitor. EXTVCC (Pin 30): External Power Input to an Internal Switch. This switch closes and supplies INTVCC, bypass- ing the internal low dropout regulator whenever EXTVCC is higher than 4.7V. See EXTVCC Connection in the Applica- tions Information section. Do not exceed 7V on this pin and ensure VEXTVCC ≤ VINTVCC. VIN (Pin 32): Main Supply Pin. Should be closely de- coupled to the IC’s signal ground pin. PGOOD (Pin 36): Open-Drain Logic Output. PGOOD is pulled to ground when the voltage on the EAIN pin is not within ±10% of its set point. |
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