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LT3757 Datasheet(PDF) 3 Page - Analog Devices |
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LT3757 Datasheet(HTML) 3 Page - Analog Devices |
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3 / 22 page  LT3935 3 Rev. 0 For more information www.analog.com ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VEN/UVLO = 5V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Input Voltage Range 3.6 36 V VIN Pin Quiescent Current EN/UVLO = 2V, Not Switching EN/UVLO = 300mV, Shutdown l 2.7 3.3 16 mA µA EN/UVLO Threshold (Falling) 1.09 1.16 1.23 V EN/UVLO Rising Hysteresis 20 mV EN/UVLO Pin Hysteresis Current 4 µA Reference VREF Voltage IVREF = 0µA IVREF = 500µA l 1.975 1.980 2 1.998 2.020 2.016 V V VREF Pin Current Limit VREF = 1.9V, Current Out of Pin 2 mA LED Current Regulation CTRL-Off Threshold (Falling) l 200 218 233 mV CTRL-Off Rising Hysteresis 20 mV CTRL Pin Current VCTRL = 2V −100 100 nA Sense Voltage (VISP−VISN) (Analog Input) VCTRL = 2V (100%), VIN = 36V, VISP = 24V VCTRL = 750mV (50%), VIN = 36V, VISP = 24V VCTRL = 300mV (5%), VIN = 36V, VISP = 24V l l l 98.5 48.5 4 100 50 5 101.5 51.5 6 mV mV mV ISP Pin Current VIN = 36V, VISP = 24V, VCTRL = 2V, Current Into Pin 50 µA ISN Pin Current VIN = 36V, VISN = 24V, VCTRL = 2V, Current Into Pin 50 µA ISP/ISN Common Mode Range VIN = 36V (Note 5) 0 36 V Current Error Amplifier Transconductance VIN = 36V, VISP = 24V 200 µA/V Duty Cycle Control of LED Current Sense Voltage (VISP−VISN) (Duty Cycle Input) CTRL Duty = 75% (100%), VIN = 12V, VISP = 10V CTRL Duty = 37.5% (50%), VIN = 12V, VISP = 10V CTRL Duty = 15% (5%), VIN = 12V, VISP = 10V 99 49 4 100 50 5 101 51 6 mV mV mV CTRL Pulse Input High (VIH) 1.6 V CTRL Pulse Input Low (VIL) 0.4 V CTRL Pulse Input Frequency Range 100 1000 kHz Voltage Regulation FB Regulation Voltage VISP = VISN = 6V, VCTRL = 2V l 0.988 1.000 1.012 V FB Pin Current VFB = 1V −100 100 nA Voltage Error Amplifier Transconductance 480 µA/V Power Stage Peak Current Limit 5.6 6.8 7.9 A Minimum Off-Time (Note 6) 55 ns Minimum On-Time (Note 6) 55 ns Bottom Switch On-Resistance 40 mΩ Top Switch On-Resistance 40 mΩ Oscillator Programmed Switching Frequency (fSW) RT = 45.3k, VSYNC/SPRD = 0V RT = 523k, VSYNC/SPRD = 0V l l 1890 180 2000 200 2150 230 kHz kHz Spread Spectrum Frequency Range RT = 45.3k, VSYNC/SPRD = 3.3V RT = 523k, VSYNC/SPRD = 3.3V 1890 180 2700 290 kHz kHz |
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