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LTC3890IGN-1TRPBF Datasheet(PDF) 9 Page - Linear Technology |
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LTC3890IGN-1TRPBF Datasheet(HTML) 9 Page - Linear Technology |
9 / 36 page LTC3890-1 9 38901f BG1, BG2 (Pin 23, Pin 18): High Current Gate Drives for Bottom (Synchronous) N-Channel MOSFETs. Voltage swing at these pins is from ground to INTVCC. BOOST1, BOOST2 (Pin 24, Pin 17): Bootstrapped Supplies to the Topside Floating Drivers. Capacitors are connected between the BOOST and SW pins and Schottky diodes are tied between the BOOST and INTVCC pins. Voltage swing at the BOOST pins is from INTVCC to (VIN + INTVCC). SW1, SW2 (Pin 25, Pin 16): Switch Node Connections to Inductors. TG1, TG2 (Pin 26, Pin 15): High Current Gate Drives for Top N-Channel MOSFETs. These are the outputs of float- ing drivers with a voltage swing equal to INTVCC – 0.5V superimposed on the switch node voltage SW. PIN FUNCTIONS PGOOD1 (Pin 27): Open-Drain Logic Output. PGOOD1 is pulled to ground when the voltage on the VFB1 pin is not within ±10% of its set point. TRACK/SS1, TRACK/SS2 (Pin 28, Pin 14): External Tracking and Soft-Start Input. The LTC3890-1 regulates the VFB1,2 voltage to the smaller of 0.8V or the voltage on the TRACK/SS1,2 pin. An internal 1μA pull-up current source is connected to this pin. A capacitor to ground at this pin sets the ramp time to final regulated output volt- age. Alternatively, a resistor divider on another voltage supply connected to this pin allows the LTC3890-1 output to track the other supply during start-up. |
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