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LTC1624CS データシート(PDF) 2 Page - Linear Technology |
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LTC1624CS データシート(HTML) 2 Page - Linear Technology |
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2 / 28 page  2 LTC1624 ABSOLUTE MAXIMUM RATINGS Input Supply Voltage (VIN).........................36V to – 0.3V Topside Driver Supply Voltage (BOOST)....42V to – 0.3V Switch Voltage (SW).................................. 36V to – 0.6V Differential Boost Voltage (BOOST to SW) ....................................7.8V to – 0.3V SENSE – Voltage VIN < 15V .................................. (VIN + 0.3V) to – 0.3V VIN ≥ 15V .......................... (VIN +0.3V) to (VIN – 15V) ITH/RUN, VFB Voltages ............................ 2.7V to – 0.3V Peak Driver Output Current < 10 µs (TG) .................... 2A Operating Temperature Range LTC1624CS ............................................ 0 °C to 70°C LTC1624IS ......................................... – 40 °C to 85°C Junction Temperature (Note 1)............................. 125 °C Storage Temperature Range ................. – 65 °C to 150°C Lead Temperature (Soldering, 10 sec).................. 300 °C PACKAGE/ORDER INFORMATION ORDER PART NUMBER S8 PART MARKING TOP VIEW VIN BOOST TG SW SENSE– ITH/RUN VFB GND S8 PACKAGE 8-LEAD PLASTIC SO 1 2 3 4 8 7 6 5 TJMAX = 125°C, θJA = 110°C/ W LTC1624CS8 LTC1624IS8 1624 1624I Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 15V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop IIN VFB Feedback Current (Note 2) 10 50 nA VFB Feedback Voltage (Note 2) q 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 q 0.5 0.8 % ITH Sourcing 5µA q – 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 q 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 % TJ = TA + (PD • 110°C/W) Note 2: The LTC1624 is tested in a feedback loop which servos VFB to the midpoint for the error amplifier (VITH = 1.8V). Note 3: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. See Applications Information. The q denotes specifications which apply over the full operating temperature range. LTC1624CS: 0 °C ≤ TA ≤ 70°C LTC1624IS: – 40 °C ≤ TA ≤ 85°C Note 1: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: |
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