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LT3518 Datasheet(PDF) 3 Page - Linear Technology |
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LT3518 Datasheet(HTML) 3 Page - Linear Technology |
3 / 20 page LT3518 3 3518fb ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2) VIN = 5V, SHDN = 5V, PWM = 5V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum VIN Operating Voltage 3V Maximum VIN Operating Voltage Continuous Operation (Note 3) 30 V Current Sense Voltage (VISP – VISN)VCTRL = 2V, VISP = 24V, VC = 1V VCTRL = 2V, VISP = 0V, VC = 1V l 96 100 100 103 mV mV 10% Scale Current Sense Voltage (VISP – VISN)VCTRL = 100mV, VISP = 24V, VC = 1V 9 mV Current Sense Voltage Line Regulation 2V < VISP < 45V 0.03 %/V VIN Supply Current PWM > 1.5V, VC = 0V PWM = 0V SHDN = 0V 6 4.5 0.1 10 1 mA mA μA Switching Frequency RT = 16.7k RT = 4.03k RT = 91.5k l 0.85 2.25 220 1.0 2.5 250 1.15 2.7 270 MHz MHz kHz RT Voltage 1V Soft-Start Pin Current SS = 0.5V, Out of Pin 6 9 12 μA SYNC Pull-Down Current (Into the Pin) VSYNC = 2V 60 μA SYNC Input Low 0.4 V SYNC Input High 1.5 V Maximum Duty Cycle RT = 91.5k (250kHz) SYNC = 300kHz Clock Signal, RT = 91.5k RT = 16.7k (1MHz) RT = 4.03k (2.5MHz) l 95 94 85 97 96 90 74 % % % % Switch Current Limit 2.3 2.8 3.5 A Switch VCESAT ISW = 1.5A 400 mV Switch Leakage Current VSW = 45V, PWM = 0V 2 μA CTRL Input Bias Current Current Out of Pin, VCTRL = 0.1V 20 100 nA Error Amplifier Transconductance 550 μS VC Output Impedance 1000 kΩ VC Idle Input Bias Current PWM = 0, VC = 1V –20 0 20 nA FB Pin Input Bias Current Current Out of Pin, VFB = 0.5V 20 100 nA FB Pin Threshold l 0.98 1.01 1.04 V ISP, ISN Idle Input Bias Current PWM = 0V 300 nA ISP, ISN Full-Scale Input Bias Current ISP Tied to ISN, VISP = 24V, VCTRL = 2V 20 μA SHDN Voltage High 1.5 V SHDN Voltage Low 0.4 V SHDN Pin Bias Current 60 100 μA PWM Input High Voltage 1.5 V PWM Input Low Voltage 0.4 V PWM Pin Bias Current 60 120 μA TGEN Input High Voltage 1.5 V TGEN Input Low Voltage 0.4 V TGEN Pin Bias Current TGEN = 5V 100 200 μA VREF Pin Voltage IREF = –100μA l 1.96 2 2.04 V |
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