Datasheet LTC3824 (Analog Devices) - 3

LTC3824
elecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VCC = 12V, RSET = 392k, CCAP = 0.1µF. No load on any outputs, unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Voltage (VCC) l 4 60 V Supply Current (IVCC) VC ≤ 0.4V (Switching Off), VCC ≤ 60V 0.8 1.3 mA VSYNC = 0V (Burst Mode Operation Disable) Supply Current (IVCC) Burst Mode Operation VCC ≤ 60V, SYNC/MODE Open, VC = 0.6V 40 65 µA Supply Current in Shutdown VC ≤ 25mV, VCC ≤ 60V 9 20 µA l 30 µA VC ≤ 25mV, VCC = 12V 5 10 µA l 15 µA
Voltage Amplifier gm
Reference Voltage (VREF) 0.792 0.8 0.808 V LTC3824E/LTC3824I l 0.788 0.812 V LTC3824MP/LTC3824H l 0.788 0.816 V Transconductance VC = 0.8V, ∆IVC = ±2µA 220 260 370 µmho FB Input Current VFB = VREF (Note 3): LTC3824E/LTC3824I l 10 30 nA LTC3824MP/LTC3824H l 10 60 nA VC High IVC = 0 1.6 V VC Low IVC = 0 0.35 0.5 V VC Source Current VVC = 0.5V to 1.3V, VFB = VREF –100mV (VSYNC = 0V) 15 µA VC Sink Current VVC = 0.7V to 1.3V, VFB = VREF +100mV (VSYNC = 0V) 15 µA VC Threshold for Switching Off VSYNC/MODE = 0V (Note 4) l 0.4 V Soft-Start Current ISS VSS = 0.1V to 1.5V 3 5 7.5 µA l 2.5 8 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 30 mV 70% Duty Cycle 20 mV Current Limit Threshold (VCC–VSENSE) VCC ≤ 60V: LTC3824E/LTC3824I l 80 100 120 mV LTC3824MP/LTC3824H l 75 100 120 mV FB Overvoltage Threshold VC = 1.6V 8 % Sense Input Current VSENSE = VCC 0.1 2 µA
Oscillator
Switching Frequency RSET = 392k: LTC3824E/LTC3824I l 170 200 230 kHz LTC3824MP/LTC3824H l 170 200 240 kHz RSET = 200k l 320 400 460 kHz Synchronization Pulse Threshold Rising Edge VSYNC 1.3 V on SYNC Pin Synchronization Frequency Range RSET = 392k l 230 300 kHz RSET = 200k l 460 600 kHz VRSET RSET = 392k 1.2 V Minimum On-Time (Measured at GATE Pin) CCM Operation (Note 5) 350 ns Switching Frequency Foldback VFB = 0.3V l 35 50 75 kHz 3824fh For more information www.linear.com/LTC3824 3 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Applications Information Typical Application Related Parts