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LTC3824IMSE-TRPBF Datasheet(PDF) 3 Page - Linear Technology |
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LTC3824IMSE-TRPBF Datasheet(HTML) 3 Page - Linear Technology |
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3 / 12 page  LTC3824 3 3824fc ELECTRICAL CHARACTERISTICS 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 LTC3824E is guaranteed to meet performance specifications from 0°C to 85°C junction temperature. Specifications over the –40°C to 85°C temperature range are assured by design characterization and correlation with statistical process controls. The LTC3824I grade is guaranteed over the full –40°C to 125°C operating junction temperature range. The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 12V, RSET = 392k, CCAP = 0.1μF. No load on any outputs, unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX UNITS VC Threshold for Switching Off VSYNC/MODE = 0V (Note 4) l 0.4 V Soft-Start Current ISS VSS = 0.1V to 1.5V 5 μA VC Burst Mode Threshold VCC ≤ 60V, VC Rising, SYNC/MODE Open 0.84 V VC Burst Mode Threshold Hysteresis VCC ≤ 60V 0.04 V SENSE Voltage at Burst Mode Operation (VCC–VSENSE) at 30% Duty Cycle 70% Duty Cycle 30 20 mV mV Current Limit Threshold (VCC–VSENSE)VCC ≤ 60V l 80 100 120 mV FB Overvoltage Threshold VC = 1.6V 8 % Sense Input Current VSENSE = VCC 0.1 2 μA OSCILLATOR Switching Frequency RSET = 392k RSET = 200k l l 170 320 200 400 230 460 kHz kHz Synchronization Pulse Threshold on SYNC Pin Rising Edge VSYNC 1.3 V Synchronization Frequency Range RSET = 392k RSET = 200k l l 230 460 300 600 kHz kHz VRSET RSET = 392k 1.2 V Minimum On-Time (Measured at GATE Pin) 3V Buck Converter Circuit, ILOAD > 2A 350 ns Switching Frequency Foldback VFB = 0.3V l 35 50 75 kHz GATE DRIVER GATE Bias Voltage (VCC–VCAP) 9V ≤ VCC ≤ 60V, IGATE = 10mA VCC = 12V, IGATE = 15mA l l 7.0 6.8 7.9 8.8 V V GATE Bias Voltage (VCAP–GND) 4V ≤ VCC ≤ 8V, IGATE = 10mA 6V ≤ VCC ≤ 8V, IGATE = 15mA, VCC = 12V l 0.2 0.85 1.5 2.8 V V GATE High Voltage (VCC–VGATE) 4V ≤ VCC ≤ 60V, IGATE = –15mA 0.5 0.8 V GATE Peak Source Current CGATE = 10nF 2.5 A GATE Low Voltage (VGATE–VCAP) 8V ≤ VCC ≤ 60V, IGATE = 15mA 4V ≤ VCC < 8V, IGATE = 10mA 0.1 0.05 0.5 V V GATE Peak Sink Current CGATE = 10nF 2.5 A Note 3: This parameter is tested in a feedback loop that servos VFB to the reference voltage with the VC pin forced to 1V. Note 4: This specification represents the maximum voltage on VC where switching (GATE pin) is guaranteed to be off. |
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