Datasheet LT8636 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current |
| Pages / Page | 26 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Revision | A |
| File Format / Size | PDF / 2.1 Mb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
Text Version of Document
LT8636
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 1 3 µA l 1 10 µA VIN Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V 1.7 4 µA l 1.7 10 µA VIN Current in Regulation VOUT = 0.97V, VIN = 6V, ILOAD = 1mA, VSYNC = 0 220 390 µA Feedback Reference Voltage VIN = 6V 0.966 0.970 0.974 V VIN = 6V l 0.956 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 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 –3 3 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 –10.75 –8 –5.25 % PG Hysteresis 0.2 % PG Leakage VPG = 3.3V –80 80 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 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 VIN to Disable Forced Continuous Mode VIN Rising 35 37 39 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings to 125°C operating junction temperature range are assured by design, may cause permanent damage to the device. Exposure to any Absolute characterization, and correlation with statistical process controls. The Maximum Rating condition for extended periods may affect device LT8636J and LT8636H are guaranteed over the full –40°C to 150°C reliability and lifetime. operating junction temperature range. High junction temperatures degrade
Note 2:
The LT8636E is guaranteed to meet performance specifications operating lifetimes. Operating lifetime is derated at junction temperatures from 0°C to 125°C junction temperature. Specifications over the –40°C greater than 125°C. The junction temperature (TJ, in °C) is calculated from Rev. A 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 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 1 3 µA l 1 10 µA VIN Quiescent Current in Sleep VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V 1.7 4 µA l 1.7 10 µA VIN Current in Regulation VOUT = 0.97V, VIN = 6V, ILOAD = 1mA, VSYNC = 0 220 390 µA Feedback Reference Voltage VIN = 6V 0.966 0.970 0.974 V VIN = 6V l 0.956 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 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 –3 3 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 –10.75 –8 –5.25 % PG Hysteresis 0.2 % PG Leakage VPG = 3.3V –80 80 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 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 VIN to Disable Forced Continuous Mode VIN Rising 35 37 39 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings to 125°C operating junction temperature range are assured by design, may cause permanent damage to the device. Exposure to any Absolute characterization, and correlation with statistical process controls. The Maximum Rating condition for extended periods may affect device LT8636J and LT8636H are guaranteed over the full –40°C to 150°C reliability and lifetime. operating junction temperature range. High junction temperatures degrade
Note 2:
The LT8636E is guaranteed to meet performance specifications operating lifetimes. Operating lifetime is derated at junction temperatures from 0°C to 125°C junction temperature. Specifications over the –40°C greater than 125°C. The junction temperature (TJ, in °C) is calculated from Rev. A 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 Package Description Revision History Typical Applications Related Parts
