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LTC1707IS8 Datasheet(PDF) 5 Page - Linear Technology |
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LTC1707IS8 Datasheet(HTML) 5 Page - Linear Technology |
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5 / 16 page  5 LTC1707 ITH (Pin 1): Error Amplifier Compensation Point. The current comparator threshold increases with this control voltage. Nominal voltage range for this pin is 0V to 1.2V. RUN/SS (Pin 2): Combination of Soft-Start and Run Control Inputs. A capacitor to ground at this pin sets the ramp time to full current output. The time is approximately 0.5s/ µF. Forcing this pin below 0.4V shuts down the LTC1707. VFB (Pin 3): Feedback Pin. Receives the feedback voltage from an external resistive divider across the output. GND (Pin 4): Ground Pin. SW (Pin 5): Switch Node Connection to Inductor. This pin connects to the drains of the internal main and synchro- nous power MOSFET switches. VIN (Pin 6): Main Supply Pin. Must be closely decoupled to GND, Pin 4. SYNC/MODE (Pin 7): This pin performs two functions: 1) synchronize with an external clock and 2) select be- tween two modes of low load current operation. To synchronize with an external clock, apply a TTL/CMOS compatible clock with a frequency between 385kHz and 550kHz. To select Burst Mode operation, float the pin or tie it to VIN. Grounding Pin 7 forces pulse skipping mode operation. VREF (Pin 8): The Output of a 1.19V ±1% Precision Reference. May be loaded up to 100 µA and is stable with up to 2000pF load capacitance. VFB VIN 3 VREF 2 1 6 5 4 Q Q R S 0.12V SWITCHING LOGIC AND BLANKING CIRCUIT 0.6V ITH RUN/SS 0.8V 0.4V 0.86V SYNC/MODE Y = “0” ONLY WHEN X IS A CONSTANT “1” SHUTDOWN SLEEP 6 Ω 1.5 µA 2.25 µA VIN VIN VIN VIN SW GND 1707 BD VIN BURST EN 7 OSC FREQ SHIFT 1.19V REF UVLO TRIP = 2.7V Y X BURST DEFEAT SLOPE COMP – + OVDET – + – + EA ICOMP – + IRCMP RUN/SOFT START ANTI- SHOOT-THRU 8 PI FU CTIO S FU CTIO AL DIAGRA |
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