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LTC3568 Datasheet(PDF) 6 Page - Linear Technology |
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LTC3568 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 18 page  LTC3568 3568fa pin FuncTions SHDN/RT (Pin 1): Combination Shutdown and Timing Resistor Pin. The oscillator frequency is programmed by connecting a resistor from this pin to ground. Forcing this pin to SVIN causes the device to be shut down. In shutdown all functions are disabled. SYNC/MODE(Pin2): Combination Mode Selection and Oscillator Synchronization Pin. This pin controls the op- eration of the device. When tied to SVIN or SGND, Burst Mode operation or pulse skipping mode is selected, respectively. If this pin is held at half of SVIN, the forced continuous mode is selected. The oscillation frequency can be syncronized to an external oscillator applied to this pin. When synchronized to an external clock pulse skip mode is selected. SGND (Pin 3): The Signal Ground Pin. All small signal componentsandcompensationcomponentsshouldbecon- nected to this ground (see Board Layout Considerations). SW(Pin4): The Switch Node Connection to the Inductor. This pin swings from PVIN to PGND. PGND(Pin5): Main Power Ground Pin. Connect to the (–) terminal of COUT, and (–) terminal of CIN. PVIN(Pin6): Main Supply Pin. Must be closely decoupled to PGND. SVIN(Pin7): The Signal Power Pin. All active circuitry is powered from this pin. Must be closely decoupled to SGND. SVIN must be greater than or equal to PVIN. PGOOD(Pin8): The Power Good Pin. This common drain logic output is pulled to SGND when the output voltage is not within ±7.5% of regulation. VFB(Pin9): Receives the feedback voltage from the ex- ternal resistive divider across the output. Nominal voltage for this pin is 0.8V. ITH(Pin10): Error Amplifier Compensation Point. The current comparator threshold increases with this control voltage. Nominal voltage range for this pin is 0V to 1.5V. GND (Exposed Pad Pin 11): Thermal Ground. Con- nect to SGND and solder to the PCB for rated thermal performance. block DiagraM – + 8 9 – + + – – + 0.74V 0.8V ERROR AMPLIFIER VB BURST COMPARATOR HYSTERESIS = 80mV BCLAMP NMOS COMPARATOR PMOS CURRENT COMPARATOR REVERSE COMPARATOR 0.86V 5 SW 4 PGOOD 10 ITH VFB 1 SHDN/RT 2 SYNC/MODE 3568 BD 6 PVIN 3 SGND 7 SVIN SLOPE COMPENSATION VOLTAGE REFERENCE OSCILLATOR LOGIC ITH LIMIT – + – + + – PGND |
Similar Part No. - LTC3568_15 |
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Similar Description - LTC3568_15 |
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