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LTC3807 数据表(PDF) 12 Page - Linear Technology |
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LTC3807 数据表(HTML) 12 Page - Linear Technology |
12 / 38 page LTC3892/ LTC3892-1/LTC3892-2 12 38921fc For more information www.linear.com/LTC3892 PIN FUNCTIONS (QFN (LTC3892 and LTC3892-2)/TSSOP (LTC3892-1)) BOOST1,BOOST2(Pins24,18/Pins25,19):Bootstrapped Supplies to the Topside Floating Drivers. Capacitors are connected between the BOOST and SW pins. Voltage swing at BOOST1 and BOOST2 pins is from approximately DRVCC to (VIN1,2 + DRVCC). SW1, SW2 (Pins 25, 17/Pins 26, 18): Switch Node Con- nections to Inductors. TG1, TG2 (Pins 26, 16/Pins 27, 17): High Current Gate Drives for Top N-Channel MOSFETs. These are the outputs of floating drivers with a voltage swing equal to DRVCC superimposed on the switch node voltage SW. TRACK/SS1, TRACK/SS2 (Pins 27, 15/Pins 28, 16): External Tracking and Soft-Start Input. The LTC3892/ LTC3892-1/LTC3892-2 regulates the negative input (EA–) of the error amplifier to the smaller of 0.8V or the voltage on the TRACK/SS pin. An internal 10µA pull-up current source is connected to this pin. A capacitor to ground at this pin sets the ramp time at start-up to the final regulated output voltage. Alternatively, a resistor divider on another supplyconnectedtotheTRACK/SSpinallowstheLTC3892/ LTC3892-1/LTC3892-2 output voltage to track the other supply during start-up. The TRACK/SS pin is pulled low in shutdown or in undervoltage lockout. VPRG1(Pin28/NA):Channel1OutputVoltageControlPin. This pin sets channel 1 to adjustable output mode using external feedback resistors or fixed 3.3V/5V output mode. Floating this pin allows the output to be programmed from 0.8V to 60V with an external resistor divider, regulating VFB1 to 0.8V. This pin is available on the LTC3892 and LTC3892-2, but not on the LTC3892-1. ITH1, ITH2 (Pins 29, 12/Pins 1, 13): Error Amplifier Outputs and Switching Regulator Compensation Points. Each associated channel’s current comparator trip point increases with this control voltage. VFB1 (Pin 30/Pin 2): For the LTC3892-1, this pin receives the remotely sensed feedback voltage for channel 1 from an external resistor divider across the output. For the LTC3892 and LTC3892-2, if the VPRG1 pin is float- ing, the VFB1 pin receives the remotely sensed feedback voltage for channel 1 from an external resistor divider across the output. If VPRG1 is tied to GND or INTVCC, the VFB1 pin receives the remotely sensed output voltage directly. SENSE1+, SENSE2+ (Pins 31, 10/Pins 3, 11): The (+) Input to the Differential Current Comparators. The ITH pin voltage and controlled offsets between the SENSE– and SENSE+ pins in conjunction with RSENSE set the current trip threshold. SENSE1–, SENSE2– (Pins 32, 9/Pins 4, 10): The (–) Input totheDifferentialCurrentComparators.WhenSENSE1,2–is greater than INTVCC, then SENSE1,2– pin supplies current to the current comparator. GND (Exposed Pad Pin 33/Exposed Pad Pin 29): Ground. The exposed pad must be soldered to the PCB for rated electrical and thermal performance. Table 1. Summary of the Differences Between the LTC3892, LTC3892-1 and LTC3892-2 LTC3892 LTC3892-1 LTC3892-2 ILIM pin for selectable current sense voltage? Yes; 50mV, 75mV, or 100mV No; fixed 75mV Yes; 50mV, 75mV, or 100mV VPRG1 pin for fixed or adjustable VOUT1? Yes; fixed 3.3V or 5V (with internal resistor divider) or adjustable with external resistor divider No; only adjustable with external resistor divider Yes; fixed 3.3V or 5V (with internal resistor divider) or adjustable with external resistor divider Independent PGOOD output for each channel? Yes; PGOOD1 and PGOOD2 No PGOOD function Yes; PGOOD1 and PGOOD2 Output overvoltage protection bottom gate "crowbar?" Yes; BG forced on Yes; BG forced on No; BG not forced on Current foldback during overcurrent events? Yes Yes No Light load operation when synchronized to external clock using PLLIN/MODE Forced Continuous Forced Continuous Pulse-skipping (Discontinuous) Package 32-Pin 5mm x 5mm QFN (UH32) 28-Lead TSSOP (FE28) 32-Pin 5mm x 5mm QFN (UH32) |
类似零件编号 - LTC3807 |
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类似说明 - LTC3807 |
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