Datasheet LT8391 (Linear Technology) - 6
| Manufacturer | Linear Technology |
| Description | 60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum |
| Pages / Page | 34 / 6 — The. denotes the specifications which apply over the full operating |
| Revision | A |
| File Format / Size | PDF / 466 Kb |
| Document Language | English |
The. denotes the specifications which apply over the full operating
Model Line for this Datasheet
Text Version of Document
LT8391 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. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 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 operating junction temperature range. High junction temperatures degrade may cause permanent damage to the device. Exposure to any Absolute operating lifetimes. Operating lifetime is derated at junction temperatures Maximum Rating condition for extended periods may affect device greater than 125°C. reliability and lifetime.
Note 3:
The LT8391 includes overtemperature protection that is intended
Note 2:
The LT8391E is guaranteed to meet performance specifications to protect the device during momentary overload conditions. Junction from 0°C to 125°C operating junction temperature. Specifications over temperature will exceed 150°C when overtemperature protection is active. the –40°C to 125°C operating junction temperature range are assured by Continuous operation above the specified absolute maximum operating design, characterization and correlation with statistical process controls. junction temperature may impair device reliability. The LT8391I is guaranteed over the –40°C to 125°C operating junction
Note 4:
VCTRL1/2 represents the condition of CTRL1 when CTRL2 is equal temperature range. The LT8391H is guaranteed over the –40°C to 150°C to 2V or the condition of CTRL2 when CTRL1 is equal to 2V. 8391fa 6 For more information www.linear.com/LT8391
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. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 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 operating junction temperature range. High junction temperatures degrade may cause permanent damage to the device. Exposure to any Absolute operating lifetimes. Operating lifetime is derated at junction temperatures Maximum Rating condition for extended periods may affect device greater than 125°C. reliability and lifetime.
Note 3:
The LT8391 includes overtemperature protection that is intended
Note 2:
The LT8391E is guaranteed to meet performance specifications to protect the device during momentary overload conditions. Junction from 0°C to 125°C operating junction temperature. Specifications over temperature will exceed 150°C when overtemperature protection is active. the –40°C to 125°C operating junction temperature range are assured by Continuous operation above the specified absolute maximum operating design, characterization and correlation with statistical process controls. junction temperature may impair device reliability. The LT8391I is guaranteed over the –40°C to 125°C operating junction
Note 4:
VCTRL1/2 represents the condition of CTRL1 when CTRL2 is equal temperature range. The LT8391H is guaranteed over the –40°C to 150°C to 2V or the condition of CTRL2 when CTRL1 is equal to 2V. 8391fa 6 For more information www.linear.com/LT8391
