Datasheet LT8640, LT8640-1 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 42V, 5A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current |
| Pages / Page | 30 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Revision | C |
| File Format / Size | PDF / 1.9 Mb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
Model Line for this Datasheet
Text Version of Document
LT8640/LT8640-1
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 2.9 3.4 V VIN Quiescent Current VEN/UV = 0V 0.75 3 µA l 0.75 10 µA VEN/UV = 2V, Not Switching, VSYNC = 0V 1.7 4 µA l 1.7 10 µA VEN/UV = 2V, Not Switching, VSYNC = 2V (LT8640 Only) 0.3 0.5 mA VIN Current in Regulation VOUT = 0.97V, VIN = 6V, Output Load = 100µA l 21 50 µA VOUT = 0.97V, VIN = 6V, Output Load = 1mA l 220 350 µA Feedback Reference Voltage VIN = 6V, ILOAD = 0.5A 0.964 0.970 0.976 V VIN = 6V, ILOAD = 0.5A l 0.958 0.970 0.982 V Feedback Voltage Line Regulation VIN = 4.0V to 42V l 0.004 0.02 %/V Feedback Pin Input Current VFB = 1V –20 20 nA BIAS Pin Current Consumption VBIAS = 3.3V, fSW = 2MHz 11 mA Minimum On-Time ILOAD = 1.5A, SYNC = 0V l 35 50 ns ILOAD = 1.5A, SYNC = 3.3V l 30 50 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 1.85 2.00 2.15 MHz Top Power NMOS On-Resistance ISW = 1A 67 mΩ Top Power NMOS Current Limit l 7.5 10 12.5 A Bottom Power NMOS On-Resistance VINTVCC = 3.4V, ISW = 1A 28 mΩ SW Leakage Current VIN = 42V, VSW = 0V, 42V –15 15 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 0.7 0.9 1.1 V SYNC/MODE Clock High Level Voltage 1.0 1.2 1.4 V SYNC/MODE DC High Level Voltage 2.3 2.6 2.9 V Spread Spectrum Modulation RT = 60.4k, VSYNC = 3.3V 22 % Frequency Range Spread Spectrum Modulation Frequency VSYNC = 3.3V 3 kHz TR/SS Source Current l 1.2 1.9 2.6 µA TR/SS Pull-Down Resistance Fault Condition, TR/SS = 0.1V 200 Ω Rev.C For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application 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 2.9 3.4 V VIN Quiescent Current VEN/UV = 0V 0.75 3 µA l 0.75 10 µA VEN/UV = 2V, Not Switching, VSYNC = 0V 1.7 4 µA l 1.7 10 µA VEN/UV = 2V, Not Switching, VSYNC = 2V (LT8640 Only) 0.3 0.5 mA VIN Current in Regulation VOUT = 0.97V, VIN = 6V, Output Load = 100µA l 21 50 µA VOUT = 0.97V, VIN = 6V, Output Load = 1mA l 220 350 µA Feedback Reference Voltage VIN = 6V, ILOAD = 0.5A 0.964 0.970 0.976 V VIN = 6V, ILOAD = 0.5A l 0.958 0.970 0.982 V Feedback Voltage Line Regulation VIN = 4.0V to 42V l 0.004 0.02 %/V Feedback Pin Input Current VFB = 1V –20 20 nA BIAS Pin Current Consumption VBIAS = 3.3V, fSW = 2MHz 11 mA Minimum On-Time ILOAD = 1.5A, SYNC = 0V l 35 50 ns ILOAD = 1.5A, SYNC = 3.3V l 30 50 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 1.85 2.00 2.15 MHz Top Power NMOS On-Resistance ISW = 1A 67 mΩ Top Power NMOS Current Limit l 7.5 10 12.5 A Bottom Power NMOS On-Resistance VINTVCC = 3.4V, ISW = 1A 28 mΩ SW Leakage Current VIN = 42V, VSW = 0V, 42V –15 15 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 0.7 0.9 1.1 V SYNC/MODE Clock High Level Voltage 1.0 1.2 1.4 V SYNC/MODE DC High Level Voltage 2.3 2.6 2.9 V Spread Spectrum Modulation RT = 60.4k, VSYNC = 3.3V 22 % Frequency Range Spread Spectrum Modulation Frequency VSYNC = 3.3V 3 kHz TR/SS Source Current l 1.2 1.9 2.6 µA TR/SS Pull-Down Resistance Fault Condition, TR/SS = 0.1V 200 Ω Rev.C For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
