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LTC1735 Datasheet(PDF) 3 Page - Linear Technology |
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LTC1735 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 24 page  LT3844 3 3844fb 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 = 49.9k, SENSE– = SENSE+ = 10V, SGND = PGND = SW = SYNC = 0V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS VCC Operating Voltage Range (Note 5) VCC Output Voltage VCC UVLO Threshold (Rising) VCC UVLO Threshold Hysteresis Over Full Line and Load Range l l 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 l l –40 1.7 95 20 –120 2.1 mA μA μA mA Error Amp Reference Voltage Measured at VFB Pin l 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 l 1.3 1.35 120 1.4 V mV Sense Pins Common Mode Range Current Limit Sense Voltage VSENSE+ – VSENSE– l l 0 90 100 36 115 V mV Input Current (ISENSE+ + ISENSE–) VSENSE(CM) = 0V VSENSE(CM) = 2V VSENSE(CM) > 4V 350 –25 –170 μA μA μA Operating Frequency l 290 270 300 310 330 kHz kHz Minimum Programmable Frequency Maximum Programmable Frequency l l 500 100 kHz kHz External Sync Frequency Range l 100 600 kHz SYNC Input Resistance 40 kΩ SYNC Voltage Threshold l 1.4 2 V Soft-Start Capacitor Control Current 2 μA Error Amp Transconductance l 270 340 410 μS Error Amp DC Voltage Gain 62 dB Error Amp Sink/Source Current ±30 μA TG Drive On Voltage (Note 7) TG Drive Off Voltage CLOAD = 2200pF CLOAD = 2200pF 9.8 0.1 V V TG Drive Rise/Fall Time 10% to 90% or 90% to 10%, CLOAD = 2200pF 40 ns Minimum TG Off Time l 350 500 ns Minimum TG On Time l 250 350 ns Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT3844 includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Note 3: The LT3844E is guaranteed to meet performance specifications from 0°C to 125°C junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT3844I is guaranteed over the full –40°C to 125°C operating junction temperature range. Note 4: VIN voltages below the start-up threshold (7.5V) are only supported when the VCC is externally driven above 6.5V. Note 5: Operating range is dictated by MOSFET absolute maximum VGS. Note 6: Supply current specification does not include switch drive currents. Actual supply currents will be higher. Note 7: DC measurement of gate drive output “ON” voltage is typically 8.6V. Internal dynamic bootstrap operation yields typical gate “ON” voltages of 9.8V during standard switching operation. Standard operation gate “ON” voltage is not tested but guaranteed by design. Note 8: The –1V absolute maximum on the SW pin is a transient condition. It is guaranteed by design and not subject to test. |
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Similar Description - LTC1735 |
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