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LT8494 Datasheet(PDF) 3 Page - Linear Technology |
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LT8494 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 26 page  LT8494 3 8494fa For more information www.linear.com/LT8494 The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = VSWEN = 12V, VBIAS = 5V, unless otherwise noted (Note 2). ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum VIN Operating Voltages VBIAS < 2.5V VBIAS ≥ 2.5V l l 2.4 2.5 0 V V Minimum BIAS Operating Voltages VIN < 2.5V VIN ≥ 2.5V l l 2.4 2.5 0 V V Power Switch Driver (PSD) Overvoltage Threshold (Note 4) VIN or BIAS Rising VIN or BIAS Falling l l 32.1 32 34 33.9 36.5 36.4 V V Power Switch Driver (PSD) Overvoltage Threshold Hysteresis (Note 4) 100 mV Quiescent Current from VIN VSWEN = 0V VSWEN = 5V, VFB = 1.25V VSWEN = 5V, VFB = 1.25V (LT8494E, LT8494I) VSWEN = 5V, VFB = 1.25V (LT8494H) l l 0.3 3.0 3.0 3.0 0.9 4.8 6.2 8.0 µA µA µA µA Quiescent Current from BIAS VSWEN = 0V VSWEN = 5V, VFB = 1.25V VSWEN = 5V, VFB = 1.25V (LT8494E, LT8494I) VSWEN = 5V, VFB = 1.25V (LT8494H) l l 0.07 1.7 1.7 1.7 0.5 2.8 3.5 10 µA µA µA µA BIAS to VIN Comparator Threshold VBIAS-VIN, VBIAS Rising, VIN = 12V VBIAS-VIN, VBIAS Falling, VIN = 12V Hysteresis (Rising-Falling Threshold) l l l 0.55 0.17 0.20 0.9 0.37 0.53 1.2 0.57 0.8 V V V Feedback Voltage l 1.178 1.202 1.230 V FB Pin Bias Current (Note 7) VFB = 1.202V 0.1 20 nA FB Voltage Line Regulation 5V ≤ VIN ≤ 32V, BIAS = 5V 5V ≤ VIN ≤ 32V, BIAS = 0V 0.2 0.2 10 10 m%/V m%/V Minimum Switch Off-Time 70 ns Minimum Switch On-Time 95 ns Switching Frequency RT = 68.1k RT = 324k l l 0.92 219 1.0 250 1.06 280 MHz kHz Switch Current Limit at Minimum Duty Cycle (Note 5) l 2.1 2.55 2.95 A Switch Current Limit at Maximum Duty Cycle (Note 6) l 1.3 1.85 2.4 A Switch VCESAT ISW = 1.2A 340 mV Switch Leakage Current (Note 7) VSW = 12V, VSWEN = 0V 0.01 1 μA Soft-Start Charging Current (Note 7) VSS = 100mV l 5.2 8.2 12.2 μA SWEN Pin Current (Note 7) VSWEN = 1.2V VSWEN = 5V VSWEN = 12V 0 35 240 25 200 550 nA nA nA SWEN Rising Voltage Threshold l 0.9 1 1.1 V SWEN Voltage Hysteresis 30 mV PG Threshold as % of VFB Regulation Voltage VFB Rising VFB Falling l l 86 82 92 88 97 93 % % PG Hysteresis 46 mV PG Output Voltage Low ISINK = 1.25mA ISINK = 100μA, VBIAS = 0V, VIN = 1.3V ISINK = 100μA, VBIAS = 1.3V, VIN = 0V l l l 33 15 15 150 150 150 mV mV mV PG Leakage Current VPG = 5V (LT8494E, LT8494I) VPG = 5V (LT8494H) l l 0 0 0.3 1.0 μA μA |
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