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LT8646SEVPBF 数据表(PDF) 4 Page - Analog Devices |
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LT8646SEVPBF 数据表(HTML) 4 Page - Analog Devices |
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4 / 30 page  LT8645S/LT8646S 4 Rev. B For more information www.analog.com PARAMETER CONDITIONS MIN TYP MAX UNITS LT8646S VC Pin to Switch Current Gain 8 A/V LT8646S VC Clamp Voltage 2.6 V BIAS Pin Current Consumption VBIAS = 3.3V, fSW = 2MHz 22 mA Minimum On-Time ILOAD = 2A, SYNC = 0V ILOAD = 2A, SYNC = 2V l l 40 35 65 60 ns ns Minimum Off-Time 80 110 ns Oscillator Frequency RT = 221k RT = 60.4k RT = 18.2k l l l 180 665 1.8 210 700 1.95 240 735 2.1 kHz kHz MHz Top Power NMOS On-Resistance ISW = 1A 36 mΩ Top Power NMOS Current Limit l 10.5 14 17.5 A Bottom Power NMOS On-Resistance VINTVCC = 3.4V, ISW = 1A 25 mΩ Bottom Power NMOS Current Limit VINTVCC = 3.4V 8.5 11 13.5 A SW Leakage Current VIN = 42V, VSW = 0V, 42V –1.5 1.5 µA EN/UV Pin Threshold EN/UV Rising l 0.95 1.01 1.07 V EN/UV Pin Hysteresis 45 mV EN/UV Pin Current VEN/UV = 2V –20 20 nA PG Upper Threshold Offset from VFB VFB Falling l 5 7.5 10 % PG Lower Threshold Offset from VFB VFB Rising l –10.5 –8 –5.5 % PG Hysteresis 0.4 % PG Leakage VPG = 3.3V –40 40 nA PG Pull-Down Resistance VPG = 0.1V l 750 2000 Ω SYNC/MODE Threshold SYNC/MODE DC and Clock Low Level Voltage SYNC/MODE Clock High Level Voltage SYNC/MODE DC High Level Voltage l l l 0.7 2.2 0.9 1.2 2.55 1.4 2.9 V V V Spread Spectrum Modulation Frequency Range RT = 60.4k, VSYNC = 3.3V 24 % Spread Spectrum Modulation Frequency VSYNC = 3.3V 2.5 kHz TR/SS Source Current l 1.2 1.9 2.6 µA TR/SS Pull-Down Resistance Fault Condition, TR/SS = 0.1V 220 Ω Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT8645SE/LT8646SE is guaranteed to meet performance specifications from 0°C to 125°C junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization, and correlation with statistical process controls. The LT8645SI/LT8646SI is guaranteed over the full –40°C to 125°C operating junction temperature range. The junction temperature (TJ, in °C) is calculated from the ambient temperature (TA in °C) and power dissipation (PD, in Watts) according to the formula: TJ = TA + (PD • θJA) where θJA (in °C/W) is the package thermal impedance. Note 3: θ values determined per JEDEC 51-7, 51-12. See Applications Information Section for information on improving the thermal resistance and for actual temperature measurements of a demo board in typical operating conditions. Note 4: This IC includes overtemperature protection that is intended to protect the device during overload conditions. Junction temperature will exceed 150°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature will reduce lifetime. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. |
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