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LTC3729 Datasheet(PDF) 7 Page - Linear Technology |
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LTC3729 Datasheet(HTML) 7 Page - Linear Technology |
7 / 28 page 7 LTC3729 sn3729 3729fas RUN/SS (Pin 1/Pin 28): Combination of Soft-Start, Run Control Input and Short-Circuit Detection Timer. A capaci- tor to ground at this pin sets the ramp time to full current output. Forcing this pin below 0.8V causes the IC to shut down all internal circuitry. All functions are disabled in shutdown. SENSE1+, SENSE2+ (Pins 2,14/Pins 30, 12): The (+) Input to the Differential Current Comparators. The ITH pin voltage and built-in offsets between SENSE– and SENSE+ pins in conjunction with RSENSE set the current trip thresh- old. SENSE1–, SENSE2– (Pins 3, 13/Pins 31, 11): The (–) Input to the Differential Current Comparators. EAIN (Pin 4/Pin 1): Input to the Error Amplifier that compares the feedback voltage to the internal 0.8V refer- ence voltage. This pin is normally connected to a resistive divider from the output of the differential amplifier (DIFFOUT). PI FU CTIO S Current Sense Pin Input Current vs Temperature EXTVCC Switch Resistance vs Temperature Oscillator Frequency vs Temperature Undervoltage Lockout vs Temperature Shutdown Latch Thresholds vs Temperature TYPICAL PERFOR A CE CHARACTERISTICS TEMPERATURE ( °C) –50 –25 0 0.5 1.5 2.0 2.5 75 100 50 4.5 3729 G27 1.0 0 25 125 3.0 3.5 4.0 LATCH ARMING LATCHOFF THRESHOLD TEMPERATURE ( °C) –50 3.40 3.45 3.50 25 75 3729 G26 3.35 3.30 –25 0 50 100 125 3.25 3.20 TEMPERATURE ( °C) –50 400 500 700 25 75 3729 G25 300 200 –25 0 50 100 125 100 0 600 VPLLFLTR = 2.4V VPLLFLTR = 1.2V VPLLFLTR = 0V TEMPERATURE ( °C) –50 –25 0 4 10 0 50 75 3729 G24 2 8 6 25 100 125 TEMPERATURE ( °C) –50 –25 25 29 35 0 50 75 3729 G23 27 33 31 25 100 125 VOUT = 5V G Package/UH Package |
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