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LT1871IMS-7-TR Datasheet(PDF) 6 Page - Linear Technology |
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LT1871IMS-7-TR Datasheet(HTML) 6 Page - Linear Technology |
6 / 32 page LTC1871-7 6 18717fc TYPICAL PERFORMANCE CHARACTERISTICS Frequency vs Temperature Maximum Sense Threshold vs Temperature SENSE Pin Current vs Temperature INTVCC Load Regulation INTVCC Line Regulation INTVCC Dropout Voltage vs Current, Temperature RUN (Pin 1): The RUN pin provides the user with an accurate means for sensing the input voltage and pro- gramming the start-up threshold for the converter. The falling RUN pin threshold is nominally 1.248V and the comparator has 100mV of hysteresis for noise immunity. When the RUN pin is below this input threshold, the IC is shut down and the VIN supply current is kept to a low value (typ 10μA). The Absolute Maximum Rating for the voltage on this pin is 7V. ITH (Pin 2): Error Amplifier Compensation Pin. The current comparator input threshold increases with this control voltage. Nominal voltage range for this pin is 0V to 1.40V. FB (Pin 3): Receives the feedback voltage from the external resistor divider across the output. Nominal voltage for this pin in regulaton is 1.230V. FREQ (Pin 4): A resistor from the FREQ pin to ground programs the operating frequency of the chip. The nominal voltage at the FREQ pin is 0.6V. PIN FUNCTIONS TEMPERATURE (°C) –50 275 280 290 295 300 325 310 0 50 75 18717 G13 285 315 320 305 –25 25 100 125 150 TEMPERATURE (°C) –50 140 145 150 155 160 –25 0 25 50 18717 G14 75 100 125 150 TEMPERATURE (°C) –50 25 30 35 0 50 75 18717 G15 –25 25 100 125 150 GATE HIGH VSENSE = 0V INTVCC LOAD (mA) 0 7.0 30 50 80 18717 G16 6.9 6.8 10 20 40 60 70 VIN = 8V VIN (V) 0 6.9 7.0 7.1 10 20 30 40 18717 G17 7.2 515 25 35 INTVCC LOAD (mA) 0 0 50 150 200 250 500 350 5 10 18717 G18 100 400 450 300 15 20 150°C 75°C 125°C 25°C –50°C 0°C |
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