Datasheet LT8228 (Analog Devices) - 4

LT8228
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. DS1 = V1D = 48V, DS2 = BIAS = 14V, RIN1 = 1k, RIN2 = 1k, and ISHARE = INTVCC unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V1 Buck Mode Input Voltage l 6 100 V V2 Boost Mode Input Voltage l 6 100 V VBIAS BIAS Operating Voltage Range l 8 100 V IQV1 DS1 Quiescent Current (Shutdown) ENABLE = 0V l 10 45 µA DS1 Quiescent Current (Not Switching) ENABLE = 2V, VUV1 = VUV2 = 0V 200 350 µA IQV2 DS2 Quiescent Current (Shutdown) ENABLE = 0V l 10 40 µA DS2 Quiescent Current (Not Switching) ENABLE = 2V, VUV1 = VUV2 = 0V 10 20 µA IQBIAS BIAS Quiescent Current (Shutdown) ENABLE = 0V l 4 10 µA BIAS Quiescent Current (Not Switching) ENABLE = 2V, VUV1 = VUV2 = 0V 3.7 5 mA ISS Soft-Start Current (Note 10) SS = 0V l 9.5 10 10.5 µA
Threshold Voltages
ENTHRESH ENABLE Threshold (Falling) l 1.16 1.20 1.24 V ENABLE Hysteresis 100 mV UVV1 UV1 Voltage Threshold (Falling) l 1.18 1.20 1.22 V UV1 Hysteresis 100 mV UVV2 UV2 Voltage Threshold (Falling) l 1.18 1.20 1.22 V UV2 Hysteresis 100 mV OVV1 FB1 Over Voltage Threshold (Rising) l 1.28 1.30 1.32 V FB1 Over Voltage Hysteresis 100 mV OVV2 FB2 Over Voltage Threshold (Rising) l 1.28 1.30 1.32 V FB2 Over Voltage Hysteresis 100 mV DRXN DRXN Logic Threshold (Rising) l 1.05 1.10 1.15 V DRXN Logic Threshold (Falling) l 0.75 0.80 0.85 V SYNC SYNC Logic Threshold (Rising) l 0.95 1.10 V SYNC Logic Threshold (Falling) l 0.65 0.80 V ISHARETHRESH ISHARE Disable Threshold (Rising) l 2.45 2.49 2.53 V ISHARE Disable Hysteresis 0.40 V
VCC Regulator
VDRVCC DRVCC Regulation Voltage 12V < VBIAS < 100V l 9.7 10 10.5 V ∆VDRVCC DRVCC Load Regulation IDRVCC = 0mA to 100mA 1.0 2.5 % IDRVCCMAX DRVCC Current Limit (Note 10) VBIAS = 14V, VDRVCC = 8V l 100 160 mA DRVCCUV DRVCC Undervoltage Threshold (Falling) l 6.1 6.35 6.6 V DRVCC Undervoltage Hysteresis 300 mV DRVCCOV DRVCC Overvoltage Threshold (Rising) l 14.6 15.1 15.6 V DRVCC Overvoltage Hysteresis 1.0 V VBIAS – VDRVCC DRVCC Dropout Voltage VBIAS = 10V, IDRVCC = 100mA l 1.0 3.5 V VINTVCC INTVCC Regulation Voltage l 3.8 4.0 4.3 V INTVCCUV INTVCC Undervoltage Threshold (Falling) l 3.45 3.6 3.75 V INTVCC Undervoltage Hysteresis 0.2 V INTVCCOV INTVCC Overvoltage Threshold (Rising) l 4.50 4.7 4.85 V INTVCC Overvoltage Hysteresis 0.5 V Rev. 0 4 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Buck Efficiency and Operation Typical Performance Characteristics Boost Efficiency and Operation ENABLE, Supply Current and VCC SS Current, Frequency, Thresholds and Driver Protection MOSFET Controller Pin Functions Block Diagram Operation Overview Buck Mode Operation Boost Mode Operation V1 Protection MOSFET Controller Operation V2 Protection MOSFET Controller Operation Mode of Operation (DRXN) Enable and Soft-Start (Enable and SS) Paralleling Multiple Controllers (ISHARE AND IGND) BIAS Supply and VCC Regulators Strong Gate Drivers Frequency Selection, Spread Spectrum and Phase-Locked Loop (RT and SYNC) FAULT Monitoring and REPORT Feature Applications Information Introduction Programming the Switching Frequency Inductor Selection RSNS2 and RIN2 Selection for Peak Inductor Current RSET2P Selection for V2 Output Current Limit (Buck Mode) RSET2N Selection for V2 Input Current Limit (Boost Mode) RMON2 Selection for V2 Current Monitoring RSNS1 and RIN1 Selection RSET1P Selection for V1 Input Current Limit (Buck Mode) RSET1N Selection for V1 Output Current Limit (Boost Mode) RMON1 Selection for V1 Current Monitoring Output Voltage, Input Undervoltage and Output Overvoltage Programming Power MOSFET Selection and Efficiency Considerations Optional Schottky Diode (D2 and D3) Selection Top MOSFET Driver Supply (CBST, DBST) Power Path Capacitor Selection Loop Compensation Inrush Current Control Boost Output Short Protection and Timer FAULT Conditions Soft-Start REPORT Feature Paralleling Multiple LT8228s BIAS, DRVCC, INTVCC and Power Dissipation Thermal Shutdown Pin Clearance/Creepage Consideration Efficiency Considerations PC Board Layout Checklist Design Example Package Description Typical Application Related Parts 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 Typical Application Related Parts