Datasheet LT8337 (Analog Devices) - 4

LT8337/LT8337-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, EN/UVLO = 2V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Bottom Switch On-Resistance ISW = 1A 32 mΩ Bottom Switch Current Limit l 5 6 6.6 A Bottom Switch Minimum Off-time 20 50 ns Bottom Switch Minimum On-time VIN = 9.5V, VOUT = 10V 20 80 ns Top Switch On-Resistance ISW = 1A 35 mΩ SW Leakage Current VOUT = 28V, SW = 0V, 28V –1.5 1.5 μA VOUT Pin Current SYNC/MODE = 0V, VOUT = 10V, Not Switching 1 μA VIN = 10.1V, VOUT = 10V , FB = 1.05V (In PassThru Mode) 30 μA PassThru Mode VIN to VOUT Threshold VIN Rising 0 V (VIN – VOUT) VIN Falling –0.6 V PassThru Mode Top Switch Reverse VIN = 9.9V, VOUT = 10V, FB = 1.05V (Top Switch Turns Off) 1.5 A Current Limit
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
These ICs include overtemperature protection that is intended to may cause permanent damage to the device. Exposure to any Absolute protect the device during momentary overload conditions. The maximum Maximum Rating condition for extended periods may affect device rated junction temperature will be exceeded when this protection is active. reliability and lifetime. Continuous operation above the specified absolute maximum operating
Note 2:
The LT8337EV/LT8337EV-1 are guaranteed to meet performance junction temperature may impair device reliability or permanently damage specifications from the 0°C to 125°C junction temperature. Specifications the device. over the –40°C to 125°C operating junction temperature range are
Note 4:
θ values are determined by simulation per JESD51 conditions. assured by design, characterization and correlation with statistical process controls. The LT8337JV/LT8337JV-1 are guaranteed to meet performance specifications over the –40°C to 150°C operating junction temperature ranges. High junction temperatures degrade operating lifetimes; operating lifetime is de-rated for junction temperatures greater than 125°C.
TYPICAL PERFORMANCE CHARACTERISTICS TA ≈ TJ = 25°C, unless otherwise noted. Efficiency and Power Loss Efficiency and Power Loss Burst Mode Efficiency vs Output Current vs Output Current vs Inductor Value
100 10000 100 10000 100 90 90 BURST EFFICIENCY 95 VIN = 13V 80 1000 80 1000 POWER LOSS (mW) POWER LOSS (mW) 90 V 70 70 IN = 5V PULSE-SKIPPING 60 100 60 100 LOSS BURST LOSS 85 50 50 80 40 10 40 10 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) FRONT PAGE CIRCUIT 30 30 PULSE-SKIPPING 75 ILOAD = 10mA EFFICIENCY 1.0μH: COILCRAFT XGL4020-102ME 20 FRONT PAGE CIRCUIT 1 20 1 70 1.5μH: COILCRAFT XGL4020-152ME VIN = 13V FRONT PAGE CIRCUIT 2.2μH: COILCRAFT XEL5030-222ME 10 10 VIN = 5V VIN = 7.2V 4.7μH: COILCRAFT XAL5030-472ME 0 0.1 0 0.1 65 0.1 1 10 100 1000 10000 1 10 100 1000 1 2 3 4 5 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) INDUCTOR VALUE (μH) 83371 G01 83371 G02 83371 G03 Rev. A 4 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts