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LTC1624CS8 Datasheet(PDF) 4 Page - Linear Technology |
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LTC1624CS8 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 28 page  4 LTC1624 TYPICAL PERFORMANCE CHARACTERISTICS 1.2 0.8 2.4 0 0IOUT(MAX) IOUT (a) 1624 G01 IOUT(MAX) SHUTDOWN ACTIVE MODE VITH vs Output Current TEMPERATURE ( °C) –40 300 250 200 150 100 50 0 5 4 3 2 1 0 35 85 1624 G14 –15 10 60 110 135 ITH/RUN = 1V ITH/RUN = 0V ITH/RUN Pin Source Current vs Temperature IITH vs VITH 200 150 50 0 3 VITH (V) 1.2 2.4 0.8 0 (b) 1624 G02 SHUTDOWN ACTIVE MODE Frequency vs Feedback Voltage FEEDBACK VOLTAGE 0 250 200 150 100 50 0 1.00 1624 G03 0.25 0.50 0.75 1.25 TEMPERATURE ( °C) –40 170 168 166 164 162 160 158 156 154 152 150 10 60 85 1448 G13 –15 35 110 135 Maximum Current Sense Threshold vs Temperature TEMPERATURE ( °C) –40 250 200 150 100 50 0 10 60 85 1448 G12 –15 35 110 135 VOUT IN REGULATION VFB = 0V PIN FUNCTIONS SENSE – (Pin 1): Connects to the (–) input for the current comparator. Built-in offsets between the SENSE – and VIN pins in conjunction with RSENSE set the current trip thresh- olds. Do not pull this pin more than 15V below VIN or more than 0.3V below ground. ITH/RUN (Pin 2): Combination of Error Amplifier Compen- sation Point and Run Control Inputs. The current com- parator threshold increases with this control voltage. Nominal voltage range for this pin is 1.19V to 2.4V. Forcing this pin below 0.8V causes the device to be shut down. In shutdown all functions are disabled and TG pin is held low. VFB (Pin 3): Receives the feedback voltage from an exter- nal resistive divider across the output. GND (Pin 4): Ground. Connect to the (–) terminal of COUT, the Schottky diode and the (–) terminal of CIN. SW (Pin 5): Switch Node Connection to Inductor. In step- down applications the voltage swing at this pin is from a Schottky diode (external) voltage drop below ground to VIN. Operating Frequency vs Temperature |
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