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LTC3862 Datasheet(PDF) 10 Page - Linear Technology |
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LTC3862 Datasheet(HTML) 10 Page - Linear Technology |
10 / 42 page LTC3862 10 3862fc For more information www.linear.com/LTC3862 pin FuncTions SENSE2+ (Pin 13/Pin 11/Pin 13): Positive Inputs to the Current Comparators. The ITH pin voltage programs the current comparator offset in order to set the peak current trip threshold. This pin is normally connected to a sense resistor in the source of the power MOSFET. SENSE1– (Pin 22/Pin 20/Pin 22): Negative Inputs to the Current Comparators. This pin is normally connected to the bottom of the sense resistor. SENSE2– (Pin 14/Pin 12/Pin 14): Negative Inputs to the Current Comparators. This pin is normally connected to the bottom of the sense resistor. SGND(Pin9/Pin7/Pin9):SignalGround.Allfeedbackand soft-startconnectionsshouldreturntoSGND.Foroptimum load regulation, the SGND pin should be kelvin connected to the PCB location between the negative terminals of the output capacitors. SLOPE (Pin 2/Pin 24/Pin 2): This pin programs the gain of the internal slope compensation. Floating this pin provides a normalized slope compensation gain of 1.00. Connecting this pin to 3V8 increases the normalized slope compensation by 66%, and connecting it to SGND decreases the normalized slope compensation by 37.5%. See Applications Information for more details. SS (Pin 6/Pin 4/Pin 6): Soft-Start Input. For soft-start operation, connecting a capacitor from this pin to SGND will clamp the output of the error amp. An internal 5µA current source will charge the capacitor and set the rate of increase of the peak switch current of the converter. SYNC (Pin 11/Pin 9/Pin 11): PLL Synchronization Input. Applying an external clock between 50kHz and 650kHz will cause the operating frequency to synchronize to the clock. SYNC is pulled down by a 50k internal resistor. The rising edge of the SYNC input waveform will align with the rising edge of GATE1 in closed-loop operation. A SYNC signal with an amplitude greater than 1.6V is considered an active high, while any signal below 0.9V is considered an active low. VIN (Pin 20/Pin 18/Pin 20): Main Supply Input. A low ESR ceramic capacitor should be connected between this pin and SGND. (SSOP/QFN/TSSOP) |
Similar Part No. - LTC3862_15 |
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Similar Description - LTC3862_15 |
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