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LTC1775IGN Datasheet(PDF) 6 Page - Linear Technology |
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LTC1775IGN Datasheet(HTML) 6 Page - Linear Technology |
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6 / 24 page  6 LTC1775 Leaving VPROG open allows the output voltage to be set by an external resistive divider between the output and VOSENSE. PGND (Pin 9): Driver Power Ground. Connects to the source of the bottom N-channel MOSFET, the (–) terminal of CVCC and the (–) terminal of CIN. BG (Pin 10): Bottom Gate Drive. Drives the gate of the bottom N-channel MOSFET between ground and INTVCC. INTVCC (Pin 11): Internal 5.2V Regulator Output. The driver and control circuits are powered from this voltage. Decouple this pin to power ground with a minimum of 4.7 µF tantalum or other low ESR capacitor. BOOST (Pin 12): Topside Floating Driver Supply. The (+) terminal of the bootstrap capacitor connects here. This pin swings from a Schottky diode drop below INTVCC to VIN + INTVCC. TG (Pin 13): Top Gate Drive. Drives the top N-channel MOSFET with a voltage swing equal to INTVCC superim- posed on the switch node voltage. SW (Pin 14): Switch Node. The (–) terminal of the boot- strap capacitor connects here. This pin swings from a diode drop below ground up to VIN. TK (Pin 15): Top MOSFET Kelvin Sense. MOSFET VDS sensing requires this pin to be routed to the drain of the top MOSFET separately from VIN. VIN (Pin 16): Main Supply Input. Decouple this pin to ground with an RC filter (1 Ω, 0.1µF) for applications above 3A. EXTVCC (Pin 1): INTVCC Switch Input. When the EXTVCC voltage is above 4.7V, the switch closes and supplies INTVCC power from EXTVCC. Do not exceed 7V at this pin. SYNC (Pin 2): Synchronization Input for Internal Oscilla- tor. The oscillator will nominally run at 150kHz when open, 225kHz when tied above 1.2V, and will lock over a 1.5:1 clock frequency range. RUN/SS (Pin 3): Run Control and Soft Start Input. A capacitor to ground at this pin sets the ramp time to full current output (approximately 1s/ µF). Forcing this pin below 1.4V shuts down the device. FCB (Pin 4): Forced Continuous Input. Tie this pin to ground to force synchronous operation at low load currents, to a resistive divider from the secondary output when using a secondary winding, or to INTVCC to enable Burst Mode operation at low load currents. ITH (Pin 5): Error Amplifier Compensation Point. The current comparator threshold increases with this control voltage, forcing inductor current to be roughly propor- tional to VITH. Nominal voltage range for this pin is 0V to 2.4V. SGND (Pin 6): Signal Ground. Connect to the (–) terminal of COUT. VOSENSE (Pin 7): Output Voltage Sense. Feedback input from the remotely sensed output voltage or from an external resistive divider across the output. VPROG (Pin 8): Output Voltage Programming. When VOSENSE is connected to the output, VPROG < 0.8V selects a 3.3V output and VPROG > 3.5V selects a 5V output. PI FU CTIO S |
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