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LTC3890-3 Datasheet(PDF) 9 Page - Linear Technology |
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LTC3890-3 Datasheet(HTML) 9 Page - Linear Technology |
9 / 40 page LTC3890-3 9 38903f For more information www.linear.com/3890-3 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(Pin24,Pin17):BootstrappedSupplies 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 Track- ing and Soft-Start Input. The LTC3890-3 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 voltage. Alternatively, a resistor divider on another voltage supply connected to this pin allows the LTC3890-3 output to track the other supply during start-up. Table 1. Summary of the Differences Between the Parts in the LTC3890 Family LTC3890 LTC3890-1 LTC3890-2 LTC3890-3 ILIM Pin for Adjustable Current Sense Voltage? Yes No Yes No CLKOUT and PHASMD Pins for PolyPhase® Operation? Yes No Yes No Independent PGOOD Pins for Each Channel Yes; PGOOD1 and PGOOD2 No; PGOOD1 Only Yes; PGOOD1 and PGOOD2 No; PGOOD1 Only Overvoltage Protection Bottom Gate “Crowbar?” Yes Yes No; BG Not Forced On No; BG Not Forced On Current Foldback During Overcurrent Events Yes Yes No No Light Load Operation When Synchronized to External Clock Using PLLIN/MODE Pin Forced Continuous Forced Continuous Pulse-Skipping Pulse-Skipping SENSE Pins Common Mode Range Operation with SENSE Common Mode < 0.5V Requires VFB < 0.65V Operation with SENSE Common Mode < 0.5V Requires VFB < 0.65V Not Dependent on VFB Voltage. Makes It Easy to Make a Non-synchronous Boost or SEPIC Converter with Ground-Referenced Current Sensing Not Dependent on VFB Voltage. Makes It Easy to Make a Non-synchronous Boost or SEPIC Converter with Ground-Referenced Current Sensing |
Similar Part No. - LTC3890-3_15 |
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Similar Description - LTC3890-3_15 |
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