Datasheet LT8648S (Analog Devices) - 3
| Hersteller | Analog Devices |
| Beschreibung | 42V, 15A Synchronous Step-Down Silent Switcher 2 |
| Seiten / Seite | 28 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Dateiformat / Größe | PDF / 2.2 Mb |
| Dokumentensprache | Englisch |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
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LT8648S
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 fSW = 400kHz 2.45 2.6 V fSW = 2MHz l 2.75 3.0 V VIN Quiescent Current in Shutdown VEN/UV = 0V, VIN = 12V 6 9 µA VIN Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.6V, VSYNC = 0V, VBIAS = 0V 140 195 µA l 140 255 µA VEN/UV = 2V, VFB > 0.6V, VSYNC = 0V, VBIAS = 5V 20 29 µA BIAS Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.6V, VSYNC = 0V, VBIAS = 5V 100 145 µA Feedback Reference Voltage VIN = 12V 0.598 0.6 0.602 V VIN = 12V l 0.594 0.6 0.604 V Feedback Voltage Line Regulation VIN = 4.0V to 40V, VC = 1.25 l 0.001 0.025 %/V Feedback Pin Input Current VFB = 0.6V –20 20 nA Error Amp Transconductance VC = 1.25V 1.1 1.45 1.8 mS Error Amp Gain 600 V/V VC Source Current VFB = 0.4V, VC = 1.25V 320 µA VC Sink Current VFB = 0.8V, VC = 1.25V 320 µA VC Pin to Switch Current Gain 18 A/V VC Clamp Voltage 2.3 V BIAS Pin Current Consumption VBIAS = 3.3V, fSW = 2MHz, VIN = 12V 60 mA Minimum On-Time ILOAD = 3A, SYNC = 2V l 25 40 ns Minimum Off-Time 75 100 ns Oscillator Frequency RT = 226k l 170 200 230 kHz RT = 38.3k l 0.96 1 1.04 MHz RT = 16.9k l 1.8 2 2.2 MHz Top Power NMOS On-Resistance ISW = 1A 12 mΩ Top Power NMOS Current Limit l 24 30 34 A Bottom Power NMOS On-Resistance VINTVCC = 3.4V, ISW = 1A 4.5 mΩ Bottom Power NMOS Current Limit VINTVCC = 3.4V 15 21 27 A SW Leakage Current VIN = 42V, VSW = 0V, 42V –1.5 1.5 µA EN/UV Pin Threshold EN/UV Rising l 0.93 0.98 1.03 V EN/UV Pin Hysteresis 40 mV EN/UV Pin Current VEN/UV = 2V –20 20 nA PG Upper Threshold Offset from VFB VFB Rising l 6 7.75 9.5 % PG Lower Threshold Offset from VFB VFB Falling l –9.5 –7.75 –6 % PG Hysteresis 0.4 % PG Leakage VPG = 3.3V –80 80 nA PG Pull-Down Resistance VPG = 0.1V l 600 2000 Ω SYNC/MODE Threshold SYNC/MODE DC and Clock Low Level Voltage l 0.7 V SYNC/MODE Clock High Level Voltage l 1.5 V SYNC/MODE DC High Level Voltage l 2.2 2.9 V Spread Spectrum Modulation RT = 38.3k 24 % Frequency Range Rev. 0 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 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 fSW = 400kHz 2.45 2.6 V fSW = 2MHz l 2.75 3.0 V VIN Quiescent Current in Shutdown VEN/UV = 0V, VIN = 12V 6 9 µA VIN Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.6V, VSYNC = 0V, VBIAS = 0V 140 195 µA l 140 255 µA VEN/UV = 2V, VFB > 0.6V, VSYNC = 0V, VBIAS = 5V 20 29 µA BIAS Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.6V, VSYNC = 0V, VBIAS = 5V 100 145 µA Feedback Reference Voltage VIN = 12V 0.598 0.6 0.602 V VIN = 12V l 0.594 0.6 0.604 V Feedback Voltage Line Regulation VIN = 4.0V to 40V, VC = 1.25 l 0.001 0.025 %/V Feedback Pin Input Current VFB = 0.6V –20 20 nA Error Amp Transconductance VC = 1.25V 1.1 1.45 1.8 mS Error Amp Gain 600 V/V VC Source Current VFB = 0.4V, VC = 1.25V 320 µA VC Sink Current VFB = 0.8V, VC = 1.25V 320 µA VC Pin to Switch Current Gain 18 A/V VC Clamp Voltage 2.3 V BIAS Pin Current Consumption VBIAS = 3.3V, fSW = 2MHz, VIN = 12V 60 mA Minimum On-Time ILOAD = 3A, SYNC = 2V l 25 40 ns Minimum Off-Time 75 100 ns Oscillator Frequency RT = 226k l 170 200 230 kHz RT = 38.3k l 0.96 1 1.04 MHz RT = 16.9k l 1.8 2 2.2 MHz Top Power NMOS On-Resistance ISW = 1A 12 mΩ Top Power NMOS Current Limit l 24 30 34 A Bottom Power NMOS On-Resistance VINTVCC = 3.4V, ISW = 1A 4.5 mΩ Bottom Power NMOS Current Limit VINTVCC = 3.4V 15 21 27 A SW Leakage Current VIN = 42V, VSW = 0V, 42V –1.5 1.5 µA EN/UV Pin Threshold EN/UV Rising l 0.93 0.98 1.03 V EN/UV Pin Hysteresis 40 mV EN/UV Pin Current VEN/UV = 2V –20 20 nA PG Upper Threshold Offset from VFB VFB Rising l 6 7.75 9.5 % PG Lower Threshold Offset from VFB VFB Falling l –9.5 –7.75 –6 % PG Hysteresis 0.4 % PG Leakage VPG = 3.3V –80 80 nA PG Pull-Down Resistance VPG = 0.1V l 600 2000 Ω SYNC/MODE Threshold SYNC/MODE DC and Clock Low Level Voltage l 0.7 V SYNC/MODE Clock High Level Voltage l 1.5 V SYNC/MODE DC High Level Voltage l 2.2 2.9 V Spread Spectrum Modulation RT = 38.3k 24 % Frequency Range Rev. 0 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 Typical Applications Related Parts