Datasheet LT8640S, LT8643S (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 42V, 6A Synchronous Step-Down Silent Switcher 2 with 2.5µA Quiescent Current |
| Pages / Page | 30 / 3 — elecTrical characTerisTics. The. denotes the specifications which apply … |
| File Format / Size | PDF / 2.3 Mb |
| Document Language | English |
elecTrical characTerisTics. The. denotes the specifications which apply over the full operating
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LT8640S/LT8643S
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 0.75 3 µA l 0.75 10 µA LT8640S VIN Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V 1.7 4 µA l 1.7 10 µA LT8643S VIN Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 0V 230 290 µA l 230 340 µA VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 5V 19 25 µA LT8643S BIAS Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 5V 200 260 µA LT8640S VIN Current in Regulation VOUT = 0.97V, VIN = 6V, ILOAD = 100µA, VSYNC = 0 l 21 60 µA VOUT = 0.97V, VIN = 6V, ILOAD = 1mA, VSYNC = 0 l 220 390 µA Feedback Reference Voltage VIN = 6V 0.964 0.970 0.976 V VIN = 6V l 0.958 0.970 0.982 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 Error Amp Transconductance VC = 1.25V 1.7 mS LT8643S Error Amp Gain 260 LT8643S VC Source Current VFB = 0.77V, VC = 1.25V 350 µA LT8643S VC Sink Current VFB = 1.17V, VC = 1.25V 350 µA LT8643S VC Pin to Switch Current Gain 5 A/V LT8643S 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 l 30 50 ns ILOAD = 1.5A, SYNC = 2V l 30 45 ns Minimum Off-Time 80 110 ns Oscillator Frequency RT = 221k l 180 210 240 kHz RT = 60.4k l 665 700 735 kHz RT = 18.2k l 1.8 1.95 2.1 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 SYNC/MODE Threshold SYNC/MODE DC and Clock Low Level Voltage l 0.7 0.9 V SYNC/MODE Clock High Level Voltage l 1.2 1.4 V SYNC/MODE DC High Level Voltage l 2.2 2.55 2.9 V 8640sfa For more information www.linear.com/LT8640S 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
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 0.75 3 µA l 0.75 10 µA LT8640S VIN Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V 1.7 4 µA l 1.7 10 µA LT8643S VIN Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 0V 230 290 µA l 230 340 µA VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 5V 19 25 µA LT8643S BIAS Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 5V 200 260 µA LT8640S VIN Current in Regulation VOUT = 0.97V, VIN = 6V, ILOAD = 100µA, VSYNC = 0 l 21 60 µA VOUT = 0.97V, VIN = 6V, ILOAD = 1mA, VSYNC = 0 l 220 390 µA Feedback Reference Voltage VIN = 6V 0.964 0.970 0.976 V VIN = 6V l 0.958 0.970 0.982 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 Error Amp Transconductance VC = 1.25V 1.7 mS LT8643S Error Amp Gain 260 LT8643S VC Source Current VFB = 0.77V, VC = 1.25V 350 µA LT8643S VC Sink Current VFB = 1.17V, VC = 1.25V 350 µA LT8643S VC Pin to Switch Current Gain 5 A/V LT8643S 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 l 30 50 ns ILOAD = 1.5A, SYNC = 2V l 30 45 ns Minimum Off-Time 80 110 ns Oscillator Frequency RT = 221k l 180 210 240 kHz RT = 60.4k l 665 700 735 kHz RT = 18.2k l 1.8 1.95 2.1 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 SYNC/MODE Threshold SYNC/MODE DC and Clock Low Level Voltage l 0.7 0.9 V SYNC/MODE Clock High Level Voltage l 1.2 1.4 V SYNC/MODE DC High Level Voltage l 2.2 2.55 2.9 V 8640sfa For more information www.linear.com/LT8640S 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
