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LT8640 Datasheet(PDF) 3 Page - Analog Devices |
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LT8640 Datasheet(HTML) 3 Page - Analog Devices |
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3 / 32 page  LT8640S/LT8643S/ LT8640SA/LT8643SA 3 Rev. D For more information www.analog.com ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage l 3.0 3.4 V VIN Quiescent Current in Shutdown VEN/UV = 0V l 0.75 0.75 3 10 µA µA LT8640S/LT8640SA VIN Quiescent Current in Sleep (Internal Compensation) VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V l 1.7 1.7 4 10 µA µA LT8643S/LT8643SA VIN Quiescent Current in Sleep (External Compensation) VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 0V l 230 230 290 340 µA µA VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 5V 19 25 µA LT8643S/LT8643SA BIAS Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 5V 200 260 µA LT8640S/LT8640SA VIN Current in Regulation VOUT = 0.97V, VIN = 6V, ILOAD = 100µA, VSYNC = 0 VOUT = 0.97V, VIN = 6V, ILOAD = 1mA, VSYNC = 0 l l 21 220 60 390 µA µA Feedback Reference Voltage VIN = 6V VIN = 6V l 0.964 0.958 0.970 0.970 0.976 0.982 V V Feedback Voltage Line Regulation VIN = 4.0V to 36V l 0.004 0.02 %/V Feedback Pin Input Current VFB = 1V –20 20 nA LT8643S/LT8643SA Error Amp Transconductance VC = 1.25V 1.7 mS LT8643S/LT8643SA Error Amp Gain 260 LT8643S/LT8643SA VC Source Current VFB = 0.77V, VC = 1.25V 350 µA LT8643S/LT8643SA VC Sink Current VFB = 1.17V, VC = 1.25V 350 µA LT8643S/LT8643SA VC Pin to Switch Current Gain 5 A/V LT8643S/LT8643SA VC Clamp Voltage 2.6 V BIAS Pin Current Consumption VBIAS = 3.3V, fSW = 2MHz 14 mA Minimum On-Time ILOAD = 1.5A, SYNC = 0V ILOAD = 1.5A, SYNC = 2V l l 30 30 50 45 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 66 mΩ Top Power NMOS Current Limit l 7.5 10 12.5 A Bottom Power NMOS On-Resistance VINTVCC = 3.4V, ISW = 1A 27 mΩ SW Leakage Current VIN = 42V, VSW = 0V, 42V –1.5 1.5 µA EN/UV Pin Threshold EN/UV Rising l 0.94 1.0 1.06 V EN/UV Pin Hysteresis 40 mV EN/UV Pin Current VEN/UV = 2V –20 20 nA PG Upper Threshold Offset from VFB VFB Falling l 5 7.5 10.25 % PG Lower Threshold Offset from VFB VFB Rising l –5.25 –8 –10.75 % PG Hysteresis 0.2 % PG Leakage VPG = 3.3V –40 40 nA PG Pull-Down Resistance VPG = 0.1V l 700 2000 Ω |
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