Datasheet LT8228 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Bidirectional Synchronous 100V Buck/Boost Controller with Reverse Supply, Reverse Current and Fault Protection |
| Pages / Page | 68 / 5 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| File Format / Size | PDF / 3.8 Mb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
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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 Protection MOSFET at V1 Terminal Controller
∆VDG1 DG1 Gate Drive l 8.0 10 12.5 V (DG1 – DS1) VDS1 = 6V, VDS2 = 0V, BIAS = 8V l 8.0 V VDS1 = 0V, VDS2 = 0V, BIAS = 8V l 8.0 V IDG1UP DG1 Pull-Up Current (Note 10) VDG1 = VDS1 = 48V, VDG2 = VDS2 =14V l 7 10 13 μA IDG1DOWN DG1 Pull-Down Current (Note 10) VDG1 – VDS1 = 5V l –110 –80 –60 mA V1NEGATIVE Negative DS1 Voltage Threshold for DG1 Off VDG1 = 0V, IDG1 = –1mA l –2.2 –1.7 V IREVERSEV1 DS1 Reverse Leakage Current VDS1 = –55V 0.6 mA VSET1NMAX ISET1N Boost Output Inrush limit in Boost VDS1 = 8V, VDG1 – VDS1 = 2.5V, IDG1 = 0, DRXN l 1.35 1.40 1.45 V Mode (Note 11) = 0V, SS > 1.5V (Boost) VSNS1P,1N(RCUR) Buck Mode Reverse Current Threshold for VDS2 = 14V, DRXN = 2V (Buck) l –5.0 –3.0 –1.0 mV DG1 Off (VSNS1P,SNSN1N) VDG1UV DG1 Undervoltage Threshold (Falling) l 3.8 4.5 5.0 V DG1 Undervoltage Hysteresis 0.5 V
Protection MOSFET at V2 Terminal Controller
∆VDG2 DG2 Gate Drive l 8.0 10 12.5 V (DG2 – DS2) VDS1 = 0V, VDS2 = 6V, BIAS = 8V l 8.0 V VDS1 = 0V, VDS2 = 0V, BIAS = 8V l 8.0 V IDG2UP DG2 Pull-Up Current (Note 10) VDG1 = VDS1 = 48V, VDG2 = VDS2 = 14V l 7 10 13 µA IDG2DOWN DG2 Pull-Down Current (Note 10) VDG2 – VDS2 = 5V l –110 –80 –60 mA V2NEGATIVE Negative DS2 Voltage Threshold for DG2 Off VDG2 = 0V, IDG2 = –1mA l –2.2 –1.7 V IREVERSEV2 DS2 Reverse Leakage Current VDS2 = –55V 0.6 mA VDG2UV DG2 Undervoltage Threshold (Falling) l 3.8 4.4 5.0 V DG2 Undervoltage Hysteresis 0.5 V
Current Sense Amplifiers (Note 12)
IB1 SNS1P, SNS1N Bias Current 2.5V < VCM1 < 100V l –105 –90 –70 µA VCM1 = 0V l 35 50 70 µA IISET1P ISET1P Output Current VRSNS1 = 1mV l 0.0 1.0 2.2 µA 2.5V < VCM1 < 100V VRSNS1 = 25mV l 24.0 25.0 26.0 µA VRSNS1 = 50mV l 48.5 50.0 51.5 µA VRSNS1 = 80mV l 78.0 80.0 82.0 µA IISET1N ISET1N Output Current VRSNS1 = –1mV l 0.0 1.0 2.2 µA 2.5V < VCM1 < 100V VRSNS1 = –25mV l 24.0 25.0 26.0 µA VRSNS1 = –50mV l 48.5 50.0 51.5 µA VRSNS1 = –80mV l 78.0 80.0 82.0 µA IIMON1 IMON1 Output Current VRSNS1 = –80mV l 78.0 80 82.0 µA 2.5V < VCM1 < 100V VRSNS1 = –50mV l 48.5 50.0 51.5 µA VRSNS1 = –25mV l 24.0 25.0 26.0 µA VRSNS1 = –1mV l 0.0 1.0 2.2 µA VRSNS1 = 1mV l 0.0 1.0 2.2 µA VRSNS1 = 25mV l 24.0 25.0 26.0 µA VRSNS1 = 50mV l 48.5 50.0 51.5 µA VRSNS1 = 80mV l 78.0 80.0 82.0 µA IISET1P, IISET1N, Output Current, VCM1 < 2.5V |VRSNS1| = 1mV l 0.0 1.0 3.0 µA IMON1 |VRSNS1| = 25mV l 22.5 25.0 27.5 µA |VRSNS1| = 50mV l 47.5 50.0 52.5 µA |VRSNS1| = 80mV l 76.0 80.0 84.0 µA Rev. 0 For more information www.analog.com 5 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
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 Protection MOSFET at V1 Terminal Controller
∆VDG1 DG1 Gate Drive l 8.0 10 12.5 V (DG1 – DS1) VDS1 = 6V, VDS2 = 0V, BIAS = 8V l 8.0 V VDS1 = 0V, VDS2 = 0V, BIAS = 8V l 8.0 V IDG1UP DG1 Pull-Up Current (Note 10) VDG1 = VDS1 = 48V, VDG2 = VDS2 =14V l 7 10 13 μA IDG1DOWN DG1 Pull-Down Current (Note 10) VDG1 – VDS1 = 5V l –110 –80 –60 mA V1NEGATIVE Negative DS1 Voltage Threshold for DG1 Off VDG1 = 0V, IDG1 = –1mA l –2.2 –1.7 V IREVERSEV1 DS1 Reverse Leakage Current VDS1 = –55V 0.6 mA VSET1NMAX ISET1N Boost Output Inrush limit in Boost VDS1 = 8V, VDG1 – VDS1 = 2.5V, IDG1 = 0, DRXN l 1.35 1.40 1.45 V Mode (Note 11) = 0V, SS > 1.5V (Boost) VSNS1P,1N(RCUR) Buck Mode Reverse Current Threshold for VDS2 = 14V, DRXN = 2V (Buck) l –5.0 –3.0 –1.0 mV DG1 Off (VSNS1P,SNSN1N) VDG1UV DG1 Undervoltage Threshold (Falling) l 3.8 4.5 5.0 V DG1 Undervoltage Hysteresis 0.5 V
Protection MOSFET at V2 Terminal Controller
∆VDG2 DG2 Gate Drive l 8.0 10 12.5 V (DG2 – DS2) VDS1 = 0V, VDS2 = 6V, BIAS = 8V l 8.0 V VDS1 = 0V, VDS2 = 0V, BIAS = 8V l 8.0 V IDG2UP DG2 Pull-Up Current (Note 10) VDG1 = VDS1 = 48V, VDG2 = VDS2 = 14V l 7 10 13 µA IDG2DOWN DG2 Pull-Down Current (Note 10) VDG2 – VDS2 = 5V l –110 –80 –60 mA V2NEGATIVE Negative DS2 Voltage Threshold for DG2 Off VDG2 = 0V, IDG2 = –1mA l –2.2 –1.7 V IREVERSEV2 DS2 Reverse Leakage Current VDS2 = –55V 0.6 mA VDG2UV DG2 Undervoltage Threshold (Falling) l 3.8 4.4 5.0 V DG2 Undervoltage Hysteresis 0.5 V
Current Sense Amplifiers (Note 12)
IB1 SNS1P, SNS1N Bias Current 2.5V < VCM1 < 100V l –105 –90 –70 µA VCM1 = 0V l 35 50 70 µA IISET1P ISET1P Output Current VRSNS1 = 1mV l 0.0 1.0 2.2 µA 2.5V < VCM1 < 100V VRSNS1 = 25mV l 24.0 25.0 26.0 µA VRSNS1 = 50mV l 48.5 50.0 51.5 µA VRSNS1 = 80mV l 78.0 80.0 82.0 µA IISET1N ISET1N Output Current VRSNS1 = –1mV l 0.0 1.0 2.2 µA 2.5V < VCM1 < 100V VRSNS1 = –25mV l 24.0 25.0 26.0 µA VRSNS1 = –50mV l 48.5 50.0 51.5 µA VRSNS1 = –80mV l 78.0 80.0 82.0 µA IIMON1 IMON1 Output Current VRSNS1 = –80mV l 78.0 80 82.0 µA 2.5V < VCM1 < 100V VRSNS1 = –50mV l 48.5 50.0 51.5 µA VRSNS1 = –25mV l 24.0 25.0 26.0 µA VRSNS1 = –1mV l 0.0 1.0 2.2 µA VRSNS1 = 1mV l 0.0 1.0 2.2 µA VRSNS1 = 25mV l 24.0 25.0 26.0 µA VRSNS1 = 50mV l 48.5 50.0 51.5 µA VRSNS1 = 80mV l 78.0 80.0 82.0 µA IISET1P, IISET1N, Output Current, VCM1 < 2.5V |VRSNS1| = 1mV l 0.0 1.0 3.0 µA IMON1 |VRSNS1| = 25mV l 22.5 25.0 27.5 µA |VRSNS1| = 50mV l 47.5 50.0 52.5 µA |VRSNS1| = 80mV l 76.0 80.0 84.0 µA Rev. 0 For more information www.analog.com 5 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
