Datasheet LT8495 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | SEPIC/Boost Converter with 2A, 70V Switch, 9μA Quiescent Current, POR and Watchdog Timer |
| 页数 / 页 | 34 / 3 — ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply … |
| 文件格式/大小 | PDF / 1.3 Mb |
| 文件语言 | 英语 |
ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply over the full operating
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LT8495
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 = VWDE = 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, VWDE = 0V, VRSTIN = 0V 0.3 0.9 µA VSWEN = 5V, VWDE = 0V, VFB = VRSTIN = 1.25V 3.0 4.8 µA VSWEN = 5V, VWDE = 5V, VFB = VRSTIN = 1.25V 3.1 4.9 µA VSWEN = 5V, VWDE = 0V, VFB = VRSTIN = 1.25V (LT8495E, LT8495I) l 3.0 6.2 µA (LT8495H) l 3.0 8.0 µA VSWEN = 5V, VWDE = 5V, VFB = VRSTIN = 1.25V (LT8495E, LT8495I) l 3.1 6.3 µA (LT8495H) l 3.1 8.0 µA Quiescent Current from BIAS VSWEN = 0V, VWDE = 0V, VRSTIN = 0V 0.07 0.5 µA VSWEN = 5V, VWDE = 0V, VFB = VRSTIN = 1.25V 1.7 2.8 µA VSWEN = 5V, VWDE = 5V, VFB = VRSTIN = 1.25V 6.0 8.5 µA VSWEN = 5V, VWDE = 0V, VFB = VRSTIN = 1.25V (LT8495E, LT8495I) l 1.7 4.0 µA (LT8495H) l 1.7 11 µA VSWEN = 5V, VWDE = 5V, VFB = VRSTIN = 1.25V (LT8495E, LT8495I) l 6.0 10.0 µA (LT8495H) l 6.0 15.5 µA BIAS to VIN Comparator Threshold VBIAS-VIN, VBIAS Rising, VIN = 12V l 0.55 0.90 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 0.80 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, VBIAS = 5V 0.2 10 m%/V 5V ≤ VIN ≤ 32V, VBIAS = 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 Min. Duty Cycle (Note 5) l 2.1 2.55 2.95 A Switch Current Limit at Max. 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 8495fb For more information www.linear.com/LT8495 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Revision History Typical Applications 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 = VWDE = 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, VWDE = 0V, VRSTIN = 0V 0.3 0.9 µA VSWEN = 5V, VWDE = 0V, VFB = VRSTIN = 1.25V 3.0 4.8 µA VSWEN = 5V, VWDE = 5V, VFB = VRSTIN = 1.25V 3.1 4.9 µA VSWEN = 5V, VWDE = 0V, VFB = VRSTIN = 1.25V (LT8495E, LT8495I) l 3.0 6.2 µA (LT8495H) l 3.0 8.0 µA VSWEN = 5V, VWDE = 5V, VFB = VRSTIN = 1.25V (LT8495E, LT8495I) l 3.1 6.3 µA (LT8495H) l 3.1 8.0 µA Quiescent Current from BIAS VSWEN = 0V, VWDE = 0V, VRSTIN = 0V 0.07 0.5 µA VSWEN = 5V, VWDE = 0V, VFB = VRSTIN = 1.25V 1.7 2.8 µA VSWEN = 5V, VWDE = 5V, VFB = VRSTIN = 1.25V 6.0 8.5 µA VSWEN = 5V, VWDE = 0V, VFB = VRSTIN = 1.25V (LT8495E, LT8495I) l 1.7 4.0 µA (LT8495H) l 1.7 11 µA VSWEN = 5V, VWDE = 5V, VFB = VRSTIN = 1.25V (LT8495E, LT8495I) l 6.0 10.0 µA (LT8495H) l 6.0 15.5 µA BIAS to VIN Comparator Threshold VBIAS-VIN, VBIAS Rising, VIN = 12V l 0.55 0.90 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 0.80 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, VBIAS = 5V 0.2 10 m%/V 5V ≤ VIN ≤ 32V, VBIAS = 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 Min. Duty Cycle (Note 5) l 2.1 2.55 2.95 A Switch Current Limit at Max. 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 8495fb For more information www.linear.com/LT8495 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Revision History Typical Applications Related Parts