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LTC1778 Datasheet(PDF) 8 Page - Linear Technology |
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LTC1778 Datasheet(HTML) 8 Page - Linear Technology |
8 / 32 page 8 LTC1735 1735fc VOSENSE: Receives the feedback voltage from an external resistive divider across the output. SENSE– : The (–) Input to the Current Comparator. SENSE+: The (+) Input to the Current Comparator. Built-in offsets between SENSE– and SENSE+ pins in conjunction with RSENSE set the current trip threshold. PGOOD (LTC1735F Only): Open-Drain Logic Output. PGOOD is pulled to ground when the voltage on the VOSENSE pin is not within ±7.5% of its set point. EXTVCC: Input to the Internal Switch Connected to INTVCC. This switch closes and supplies VCC power whenever EXTVCC is higher than 4.7V. See EXTVCC connection in the Applications Information section. Do not exceed 7V on this pin and ensure EXTVCC ≤ VIN. PGND: Driver Power Ground. Connects to the source of bottom N-channel MOSFET, the anode of the Schottky diode, and the (–) terminal of CIN. BG: High Current Gate Drive for Bottom N-Channel MOSFET. Voltage swing at this pin is from ground to INTVCC. INTVCC: Output of the Internal 5.2V Regulator and EXTVCC Switch. The driver and control circuits are powered from this voltage. Decouple to power ground with a 1 µFceramic capacitor placed directly adjacent to the IC together with a minimum of 4.7 µF tantalum or other low ESR capacitor. VIN: Main Supply Pin. Must be closely decoupled to power ground. SW: Switch Node Connection to Inductor and Bootstrap Capacitor. Voltage swing at this pin is from a Schottky diode (external) voltage drop below ground to VIN. BOOST: Supply to Topside Floating Driver. The bootstrap capacitor is returned to this pin. Voltage swing at this pin is from a diode drop below INTVCC to (VIN + INTVCC). TG: High Current Gate Drive for Top N-Channel MOSFET. This is the output of a floating driver with a voltage swing equal to INTVCC superimposed on the switch node voltage SW. PI FU CTIO S |
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