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LTC1772 Datasheet(PDF) 4 Page - Linear Technology |
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LTC1772 Datasheet(HTML) 4 Page - Linear Technology |
4 / 12 page 4 LTC1772 1772fb FUNCTIONAL DIAGRA SWITCHING LOGIC AND BLANKING CIRCUIT – + 0.5 µA 0.3V 0.3V OVP SHORT-CIRCUIT DETECT SHDN 1.2V UV 1772 FD VREF + 60mV VREF 0.8V VIN RS1 VOLTAGE REFERENCE SLOPE COMP ICMP R S Q FREQ FOLDBACK OSC SENSE– VIN 5 2 4 – + 4 EAMP VFB – + 3 PGATE VIN 6 ITH/RUN VIN 0.35V VREF 0.8V 1 – + SHDN CMP GND – + UNDERVOLTAGE LOCKOUT VIN 0.15V – + BURST CMP SLEEP PIN FUNCTIONS ITH/RUN (Pin 1): This pin performs two functions. It serves as the error amplifier compensation point as well as the run control input. The current comparator threshold increases with this control voltage. Nominal voltage range for this pin is 0.7V to 1.9V. Forcing this pin below 0.35V causes the device to be shut down. In shutdown all functions are disabled and the PGATE pin is held high. GND (Pin 2): Ground Pin. VFB (Pin 3): Receives the feedback voltage from an exter- nal resistive divider across the output. SENSE– (Pin 4): The Negative Input to the Current Com- parator. VIN (Pin 5): Supply Pin. Must be closely decoupled to GND Pin 2. PGATE (Pin 6): Gate Drive for the External P-Channel MOSFET. This pin swings from 0V to VIN. |
Similar Part No. - LTC1772_15 |
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Similar Description - LTC1772_15 |
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