LTC1624 WWWUUWUABSOLUTE MAXIMUM RATINGSPACKAGE/ORDER INFORMATION Input Supply Voltage (VIN)...36V to – 0.3V ORDER PART Topside Driver Supply Voltage (BOOST)..42V to – 0.3V TOP VIEW NUMBER Switch Voltage (SW).. 36V to – 0.6V SENSE– 1 8 VIN Differential Boost Voltage I 2 7 BOOST LTC1624CS8 (BOOST to SW) ..7.8V to – 0.3V TH/RUN V 3 6 TG LTC1624IS8 SENSE – Voltage FB GND 4 5 SW VIN < 15V .. (VIN + 0.3V) to – 0.3V V S8 PACKAGE S8 PART MARKING IN ≥ 15V .. (VIN +0.3V) to (VIN – 15V) 8-LEAD PLASTIC SO ITH/RUN, VFB Voltages .. 2.7V to – 0.3V Peak Driver Output Current < 10µs (TG) .. 2A T 1624 JMAX = 125°C, θJA = 110°C/ W Operating Temperature Range 1624I LTC1624CS .. 0°C to 70°C LTC1624IS ... – 40°C to 85°C Consult factory for Military grade parts. Junction Temperature (Note 1)... 125°C Storage Temperature Range ... – 65°C to 150°C Lead Temperature (Soldering, 10 sec).. 300°C ELECTRICAL CHARACTERISTICS TA = 25 ° C, VIN = 15V, unless otherwise noted.SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITSMain Control Loop IIN VFB Feedback Current (Note 2) 10 50 nA VFB Feedback Voltage (Note 2) ● 1.1781 1.19 1.2019 V ∆VLINE REG Reference Voltage Line Regulation VIN = 3.6V to 20V (Note 2) 0.002 0.01 %/V ∆VLOAD REG Output Voltage Load Regulation (Note 2) ITH Sinking 5µA ● 0.5 0.8 % ITH Sourcing 5µA ● – 0.5 – 0.8 % VOVL Output Overvoltage Lockout 1.24 1.28 1.32 V IQ Input DC Supply Current (Note 3) Normal Mode 550 900 µA Shutdown VITH/RUN = 0V 16 30 µA VITH/RUN Run Threshold 0.6 0.8 V IITH/RUN Run Current Source VITH/RUN = 0.3V – 0.8 – 2.5 – 5.0 µA Run Pullup Current VITH/RUN = 1V – 50 –160 – 350 µA ∆VSENSE(MAX) Maximum Current Sense Threshold VFB = 1.0V 145 160 185 mV TG Transition Time TG tr Rise Time CLOAD = 3000pF 50 150 ns TG tf Fall Time CLOAD = 3000pF 50 150 ns fOSC Oscillator Frequency ● 175 200 225 kHz VBOOST Boost Voltage SW = 0V, IBOOST = 5mA, VIN = 8V 4.8 5.15 5.5 V ∆VBOOST Boost Load Regulation SW = 0V, IBOOST = 2mA to 20mA 3 5 % The ● denotes specifications which apply over the full operating TJ = TA + (PD • 110°C/W) temperature range. Note 2: The LTC1624 is tested in a feedback loop which servos VFB to LTC1624CS: 0°C ≤ TA ≤ 70°C the midpoint for the error amplifier (VITH = 1.8V). LTC1624IS: – 40°C ≤ TA ≤ 85°C Note 3: Dynamic supply current is higher due to the gate charge being Note 1: TJ is calculated from the ambient temperature TA and power delivered at the switching frequency. See Applications Information. dissipation PD according to the following formula: 2
