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LT3845EFEPBF Datasheet(PDF) 3 Page - Linear Technology |
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LT3845EFEPBF Datasheet(HTML) 3 Page - Linear Technology |
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3 / 26 page  LT3845 3 3845fd PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Operating Voltage Range (Note 4) VIN Minimum Start Voltage VIN UVLO Threshold (Falling) VIN UVLO Threshold Hysteresis ● ● ● 4 3.6 3.8 670 60 7.5 4 V V V mV VIN Supply Current VIN Burst Mode Current VIN Shutdown Current VCC > 9V VBURST_EN = 0V, VFB = 1.35V VSHDN = 0V ● 20 20 915 μA μA μA BOOST Operating Voltage Range BOOST Operating Voltage Range (Note 5) BOOST UVLO Threshold (Rising) BOOST UVLO Threshold Hysteresis VBOOST – VSW VBOOST – VSW VBOOST – VSW ● ● 5 400 75 20 V V V mV BOOST Supply Current (Note 6) BOOST Burst Mode Current BOOST Shutdown Current VBURST_EN = 0V VSHDN = 0V 1.4 0.1 0.1 mA μA μA VCC Operating Voltage Range (Note 5) VCC Output Voltage VCC UVLO Threshold (Rising) VCC UVLO Threshold Hysteresis Over Full Line and Load Range ● ● 8 6.25 500 20 8.3 V V V mV VCC Supply Current (Note 6) VCC Burst Mode Current VCC Shutdown Current VCC Current Limit VBURST_EN = 0V VSHDN = 0V ● ● –40 3 100 20 –150 3.7 mA μA μA mA Error Amp Reference Voltage Measured at VFB Pin ● 1.224 1.215 1.231 1.238 1.245 V V VFB Pin Input Current VFB = 1.231V 25 nA SHDN Enable Threshold (Rising) SHDN Threshold Hysteresis ● 1.3 1.35 120 1.4 V mV Sense Pins Common Mode Range Current Limit Sense Voltage Reverse Protect Sense Voltage Reverse Current Inhibit Offset VSENSE+ – VSENSE– VSENSE+ – VSENSE–, VBURST_EN = VCC VBURST_EN = 0V or VBURST_EN = VFB ● ● 0 90 100 –100 10 36 115 V mV mV mV Input Current (ISENSE+ + ISENSE–)VSENSE(CM) = 0V VSENSE(CM) = 2V VSENSE(CM) > 4V 800 –20 –300 μA μA μA Operating Frequency ● 270 300 330 kHz Minimum Programmable Frequency Maximum Programmable Frequency ● ● 500 100 kHz kHz External Sync Frequency Range ● 100 600 kHz SYNC Input Resistance 40 kΩ SYNC Voltage Threshold ● 1.4 2 V Soft-Start Capacitor Control Current 2μA Error Amp Transconductance ● 270 340 410 μS Error Amp DC Voltage Gain 62 dB Error Amp Sink/Source Current ±30 μA ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 20V, VCC = BOOST = BURST_EN = 10V, SHDN = 2V, RSET = 49.9kΩ, SENSE– = SENSE+ = 10V, SGND = PGND = SW = SYNC = 0V, unless otherwise noted. |
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