Datasheet LT8494 (Analog Devices) - 3
| Hersteller | Analog Devices |
| Beschreibung | SEPIC/Boost DC/DC Converter with 2A, 70V Switch, and 7μA Quiescent Current |
| Seiten / Seite | 26 / 3 — ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply … |
| Dateiformat / Größe | PDF / 615 Kb |
| Dokumentensprache | Englisch |
ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply over the full operating
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LT8494
ELECTRICAL CHARACTERISTICS 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). PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum VIN Operating Voltages VBIAS < 2.5V l 2.4 2.5 V VBIAS ≥ 2.5V l 0 V Minimum BIAS Operating Voltages VIN < 2.5V l 2.4 2.5 V VIN ≥ 2.5V l 0 V Power Switch Driver (PSD) Overvoltage Threshold VIN or BIAS Rising l 32.1 34 36.5 V (Note 4) VIN or BIAS Falling l 32 33.9 36.4 V Power Switch Driver (PSD) Overvoltage Threshold 100 mV Hysteresis (Note 4) Quiescent Current from VIN VSWEN = 0V 0.3 0.9 µA VSWEN = 5V, VFB = 1.25V 3.0 4.8 µA VSWEN = 5V, VFB = 1.25V (LT8494E, LT8494I) l 3.0 6.2 µA VSWEN = 5V, VFB = 1.25V (LT8494H) l 3.0 8.0 µA Quiescent Current from BIAS VSWEN = 0V 0.07 0.5 µA VSWEN = 5V, VFB = 1.25V 1.7 2.8 µA VSWEN = 5V, VFB = 1.25V (LT8494E, LT8494I) l 1.7 3.5 µA VSWEN = 5V, VFB = 1.25V (LT8494H) l 1.7 10 µA BIAS to VIN Comparator Threshold VBIAS-VIN, VBIAS Rising, VIN = 12V l 0.55 0.9 1.2 V VBIAS-VIN, VBIAS Falling, VIN = 12V l 0.17 0.37 0.57 V Hysteresis (Rising-Falling Threshold) l 0.20 0.53 0.8 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 0.2 10 m%/V 5V ≤ VIN ≤ 32V, BIAS = 0V 0.2 10 m%/V Minimum Switch Off-Time 70 ns Minimum Switch On-Time 95 ns Switching Frequency RT = 68.1k l 0.92 1.0 1.06 MHz RT = 324k l 219 250 280 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 0 25 nA VSWEN = 5V 35 200 nA VSWEN = 12V 240 550 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 l 86 92 97 % VFB Falling l 82 88 93 % PG Hysteresis 46 mV PG Output Voltage Low ISINK = 1.25mA l 33 150 mV ISINK = 100μA, VBIAS = 0V, VIN = 1.3V l 15 150 mV ISINK = 100μA, VBIAS = 1.3V, VIN = 0V l 15 150 mV PG Leakage Current VPG = 5V (LT8494E, LT8494I) l 0 0.3 μA VPG = 5V (LT8494H) l 0 1.0 μA 8494fa For more information www.linear.com/LT8494 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Related Parts
ELECTRICAL CHARACTERISTICS 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). PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum VIN Operating Voltages VBIAS < 2.5V l 2.4 2.5 V VBIAS ≥ 2.5V l 0 V Minimum BIAS Operating Voltages VIN < 2.5V l 2.4 2.5 V VIN ≥ 2.5V l 0 V Power Switch Driver (PSD) Overvoltage Threshold VIN or BIAS Rising l 32.1 34 36.5 V (Note 4) VIN or BIAS Falling l 32 33.9 36.4 V Power Switch Driver (PSD) Overvoltage Threshold 100 mV Hysteresis (Note 4) Quiescent Current from VIN VSWEN = 0V 0.3 0.9 µA VSWEN = 5V, VFB = 1.25V 3.0 4.8 µA VSWEN = 5V, VFB = 1.25V (LT8494E, LT8494I) l 3.0 6.2 µA VSWEN = 5V, VFB = 1.25V (LT8494H) l 3.0 8.0 µA Quiescent Current from BIAS VSWEN = 0V 0.07 0.5 µA VSWEN = 5V, VFB = 1.25V 1.7 2.8 µA VSWEN = 5V, VFB = 1.25V (LT8494E, LT8494I) l 1.7 3.5 µA VSWEN = 5V, VFB = 1.25V (LT8494H) l 1.7 10 µA BIAS to VIN Comparator Threshold VBIAS-VIN, VBIAS Rising, VIN = 12V l 0.55 0.9 1.2 V VBIAS-VIN, VBIAS Falling, VIN = 12V l 0.17 0.37 0.57 V Hysteresis (Rising-Falling Threshold) l 0.20 0.53 0.8 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 0.2 10 m%/V 5V ≤ VIN ≤ 32V, BIAS = 0V 0.2 10 m%/V Minimum Switch Off-Time 70 ns Minimum Switch On-Time 95 ns Switching Frequency RT = 68.1k l 0.92 1.0 1.06 MHz RT = 324k l 219 250 280 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 0 25 nA VSWEN = 5V 35 200 nA VSWEN = 12V 240 550 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 l 86 92 97 % VFB Falling l 82 88 93 % PG Hysteresis 46 mV PG Output Voltage Low ISINK = 1.25mA l 33 150 mV ISINK = 100μA, VBIAS = 0V, VIN = 1.3V l 15 150 mV ISINK = 100μA, VBIAS = 1.3V, VIN = 0V l 15 150 mV PG Leakage Current VPG = 5V (LT8494E, LT8494I) l 0 0.3 μA VPG = 5V (LT8494H) l 0 1.0 μA 8494fa For more information www.linear.com/LT8494 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Related Parts