Datasheet LT8390 (Analog Devices) - 5
| Fabricante | Analog Devices |
| Descripción | 60V Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum |
| Páginas / Página | 32 / 5 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Formato / tamaño de archivo | PDF / 1.2 Mb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
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LT8390
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VEN/UVLO = 1.5V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
SS Fault Latch-Off Threshold 1.7 V SS Fault Reset Threshold 0.2 V
Oscillator
RT Pin Voltage RT = 100kΩ 1.00 V Switching Frequency VSYNC/SPRD = 0V, RT = 226kΩ l 190 200 210 kHz VSYNC/SPRD = 0V, RT = 100kΩ l 380 400 420 kHz VSYNC/SPRD = 0V, RT = 59.0kΩ l 570 600 630 kHz SYNC Frequency 150 650 kHz SYNC/SPRD Input Bias Current VSYNC/SPRD = 5V –0.1 0 0.1 µA SYNC/SPRD Threshold Voltage 0.4 1.5 V Highest Spread Spectrum Above Oscillator Frequency VSYNC/SPRD = 5V 12.5 14.5 16.5 % Lowest Spread Spectrum Below Oscillator Frequency VSYNC/SPRD = 5V –17.7 –15.7 –13.7 %
Region Transition
Buck-Boost to Boost (VIN/VOUT) 0.73 0.75 0.77 Boost to Buck-Boost (VIN/VOUT) 0.83 0.85 0.87 Buck to Buck-Boost (VIN/VOUT) 1.16 1.18 1.20 Buck-Boost to Buck (VIN/VOUT) 1.31 1.33 1.35 Peak-Buck to Peak-Boost (VIN/VOUT) 0.96 0.98 1.00 Peak-Boost to Peak-Buck (VIN/VOUT) 1.00 1.02 1.04
NMOS Drivers
TG1, TG2 Gate Driver On-Resistance V(BST-SW) = 5V Gate Pull-Up 2.6 Ω Gate Pull-Down 1.4 Ω BG1, BG2 Gate Driver On-Resistance VINTVCC = 5V Gate Pull-Up 3.2 Ω Gate Pull-Down 1.2 Ω TG1, TG2 Rise Time CL = 3.3nF, 10% to 90% 25 ns TG1, TG2 Fall Time CL = 3.3nF, 90% to 10% 20 ns BG1, BG2 Rise Time CL = 3.3nF, 10% to 90% 25 ns BG1, BG2 Fall Time CL = 3.3nF, 90% to 10% 20 ns TG Off to BG On Delay CL = 3.3nF 60 ns BG Off to TG On Delay CL = 3.3nF 60 ns TG1 Minimum Duty Cycle in Buck Region Peak-Buck Current Mode 10 % TG1 Maximum Duty Cycle in Buck Region Peak-Buck Current Mode 95 % TG1 Fixed Duty Cycle in Buck-Boost Region Peak-Boost Current Mode 85 % BG2 Fixed Duty Cycle in Buck-Boost Region Peak-Buck Current Mode 15 % BG2 Minimum Duty Cycle in Boost Region Peak-Boost Current Mode 10 % BG2 Maximum Duty Cycle in Boost Region Peak-Boost Current Mode 95 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings temperature range. The LT8390H is guaranteed over the –40°C to 150°C may cause permanent damage to the device. Exposure to any Absolute operating junction temperature range. High junction temperatures degrade Maximum Rating condition for extended periods may affect device operating lifetimes. Operating lifetime is derated at junction temperatures reliability and lifetime. greater than 125°C.
Note 2:
The LT8390E is guaranteed to meet performance specifications
Note 3:
The LT8390 includes overtemperature protection that is intended from 0°C to 125°C operating junction temperature. Specifications over to protect the device during momentary overload conditions. Junction the –40°C to 125°C operating junction temperature range are assured by temperature will exceed 150°C when overtemperature protection is active. design, characterization and correlation with statistical process controls. Continuous operation above the specified absolute maximum operating The LT8390I is guaranteed over the –40°C to 125°C operating junction junction temperature may impair device reliability. 8390fa For more information www.linear.com/LT8390 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information 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 (Note 2). VIN = 12V, VEN/UVLO = 1.5V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
SS Fault Latch-Off Threshold 1.7 V SS Fault Reset Threshold 0.2 V
Oscillator
RT Pin Voltage RT = 100kΩ 1.00 V Switching Frequency VSYNC/SPRD = 0V, RT = 226kΩ l 190 200 210 kHz VSYNC/SPRD = 0V, RT = 100kΩ l 380 400 420 kHz VSYNC/SPRD = 0V, RT = 59.0kΩ l 570 600 630 kHz SYNC Frequency 150 650 kHz SYNC/SPRD Input Bias Current VSYNC/SPRD = 5V –0.1 0 0.1 µA SYNC/SPRD Threshold Voltage 0.4 1.5 V Highest Spread Spectrum Above Oscillator Frequency VSYNC/SPRD = 5V 12.5 14.5 16.5 % Lowest Spread Spectrum Below Oscillator Frequency VSYNC/SPRD = 5V –17.7 –15.7 –13.7 %
Region Transition
Buck-Boost to Boost (VIN/VOUT) 0.73 0.75 0.77 Boost to Buck-Boost (VIN/VOUT) 0.83 0.85 0.87 Buck to Buck-Boost (VIN/VOUT) 1.16 1.18 1.20 Buck-Boost to Buck (VIN/VOUT) 1.31 1.33 1.35 Peak-Buck to Peak-Boost (VIN/VOUT) 0.96 0.98 1.00 Peak-Boost to Peak-Buck (VIN/VOUT) 1.00 1.02 1.04
NMOS Drivers
TG1, TG2 Gate Driver On-Resistance V(BST-SW) = 5V Gate Pull-Up 2.6 Ω Gate Pull-Down 1.4 Ω BG1, BG2 Gate Driver On-Resistance VINTVCC = 5V Gate Pull-Up 3.2 Ω Gate Pull-Down 1.2 Ω TG1, TG2 Rise Time CL = 3.3nF, 10% to 90% 25 ns TG1, TG2 Fall Time CL = 3.3nF, 90% to 10% 20 ns BG1, BG2 Rise Time CL = 3.3nF, 10% to 90% 25 ns BG1, BG2 Fall Time CL = 3.3nF, 90% to 10% 20 ns TG Off to BG On Delay CL = 3.3nF 60 ns BG Off to TG On Delay CL = 3.3nF 60 ns TG1 Minimum Duty Cycle in Buck Region Peak-Buck Current Mode 10 % TG1 Maximum Duty Cycle in Buck Region Peak-Buck Current Mode 95 % TG1 Fixed Duty Cycle in Buck-Boost Region Peak-Boost Current Mode 85 % BG2 Fixed Duty Cycle in Buck-Boost Region Peak-Buck Current Mode 15 % BG2 Minimum Duty Cycle in Boost Region Peak-Boost Current Mode 10 % BG2 Maximum Duty Cycle in Boost Region Peak-Boost Current Mode 95 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings temperature range. The LT8390H is guaranteed over the –40°C to 150°C may cause permanent damage to the device. Exposure to any Absolute operating junction temperature range. High junction temperatures degrade Maximum Rating condition for extended periods may affect device operating lifetimes. Operating lifetime is derated at junction temperatures reliability and lifetime. greater than 125°C.
Note 2:
The LT8390E is guaranteed to meet performance specifications
Note 3:
The LT8390 includes overtemperature protection that is intended from 0°C to 125°C operating junction temperature. Specifications over to protect the device during momentary overload conditions. Junction the –40°C to 125°C operating junction temperature range are assured by temperature will exceed 150°C when overtemperature protection is active. design, characterization and correlation with statistical process controls. Continuous operation above the specified absolute maximum operating The LT8390I is guaranteed over the –40°C to 125°C operating junction junction temperature may impair device reliability. 8390fa For more information www.linear.com/LT8390 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts