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LTC1701 Datasheet(PDF) 3 Page - Linear Technology |
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LTC1701 Datasheet(HTML) 3 Page - Linear Technology |
3 / 12 page 3 LTC1701 SW (Pin 1): The Switch Node Connection to the Inductor. This pin swings from VIN to a Schottky diode (external) voltage drop below ground. The cathode of the Schottky diode must be closely connected to this pin. GND (Pin 2): Ground Pin. Connect to the (–) terminal of COUT, the Schottky diode and (–) terminal of CIN. VFB (Pin 3): Receives the feedback voltage from the external resistive divider across the output. Nominal volt- age for this pin is 1.25V. ITH/RUN (Pin 4): Combination of Error Amplifier Compen- sation Point and Run Control Input. The current compara- tor threshold increases with this control voltage. Nominal voltage range for this pin is 1.25V to 2.25V. Forcing this pin below 0.8V causes the device to be shut down. In shutdown all functions are disabled. VIN (Pin 5): Main Supply Pin and the (+) Input to the Current Comparator. Must be closely decoupled to ground. PI FU CTIO S BLOCK DIAGRA – + 1.25V BANDGAP REFERENCE ITH/REF CLAMP SHDN 50 µA VREF VREF 1.4V 1.5V VREF (1.25V) – + OVER VOLTAGE COMP – + ITH COMP – + ERROR AMP (1.25V TO 2.25V) – + CURRENT COMP VREF – + CURRENT SENSE AMP SW GND 1701 BD VIN OFF-TIMER AND GATE CONTROL LOGIC GATE DRIVER VFB ITH/RUN PULSE STRETCHER VFB < 0.6V VIN VIN Pin Limit Table NOMINAL (V) ABSOLUTE MAX (V) PIN NAME DESCRIPTION MIN TYP MAX MIN MAX 1 SW Switch Node – 0.3 VIN – 0.3 VIN + 0.3 2 GND Ground Pin 0 3VFB Output Feedback Pin 0 1.25 1.35 – 0.3 3 4ITH/RUN Error Amplifier Compensation and RUN Pin 0 2.25 – 0.3 3 5VIN Main Power Supply 2.5 5.5 – 0.3 6 |
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Similar Description - LTC1701 |
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