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LT1680ISW Datasheet(PDF) 7 Page - Linear Technology |
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LT1680ISW Datasheet(HTML) 7 Page - Linear Technology |
7 / 16 page 7 LT1680 RUN/SHDN (Pin 11): Precision Referenced Shutdown. Can be used as logic level input for shutdown control or as an analog monitor for input supply undervoltage protec- tion, etc. IC is enabled when RUN/SHDN pin rising edge exceeds 1.25V. 15mV of hysteresis helps assure stable mode switching. All internal functions are disabled in shutdown mode. If this function is not desired, connect RUN/SHDN to 12VIN (typically through a 100k resistor). See Applications Information. PGND (Pin 12): Power Ground. References the output switch and internal driver control circuits. Connect with low impedance trace to VIN decoupling capacitor negative (ground) terminal. PIN FUNCTIONS GATE (Pin 13): Driver Output. Connect to gate of external power FET switch. 12VIN (Pin 14): 12V Power Supply Input. Bypass with at least 1 µF to PGND. SYNC (Pin 15): Oscillator Synchronization Pin with TTL-Level Compatible Input. Input drives internal rising edge triggered one shot; SYNC signal on/off times should be ≥1µs (10% to 90% duty cycle at 100kHz). Does not contain internal pull-up. Connect to SGND if not used. 5VREF (Pin 16): 5V Reference Output. Allows connection of external loads up to 10mA DC. Reference is not available during shutdown. Typically bypassed with at least 1 µF capacitor to SGND. REFERENCE ONE SHOT – 1.25V Q UVLO CIRCUIT SR 5VREF 5V SYNC GATE SENSE + SENSE – IAVG VIN VOUT RSENSE 12VIN PGND SGND OSC CT RCT CCT VC SL/ADJ VREF VFB – + – + IC1 – + 2.5V 1680 BD – + EA 0.5 µA CURRENT SENSE AMPLIFIER SS 1.25V CIRCUIT ENABLE RUN/SHDN + RUN SHDN 10 µA SOFT START 12V – + ×15 VOUT BLOCK DIAGRAM |
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