Datasheet LTC3731 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller |
| Pages / Page | 34 / 3 — ORDER INFORMATION LEAD FREE FINISH. TAPE AND REEL. PART MARKING. PACKAGE … |
| File Format / Size | PDF / 384 Kb |
| Document Language | English |
ORDER INFORMATION LEAD FREE FINISH. TAPE AND REEL. PART MARKING. PACKAGE DESCRIPTION. TEMPERATURE RANGE
Model Line for this Datasheet
Text Version of Document
LTC3731
ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3731CG#PBF LTC3731CG#TRPBF LTC3731CG 36-Lead Plastic SSOP 0°C to 70°C LTC3731IG#PBF LTC3731IG#TRPBF LTC3731IG 36-Lead Plastic SSOP –40°C to 85°C LTC3731CUH#PBF LTC3731CUH#TRPBF 3731 32-Lead (5mm × 5mm) Plastic QFN 0°C to 70°C LTC3731IUH#PBF LTC3731IUH#TRPBF 3731I 32-Lead (5mm × 5mm) Plastic QFN –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = VRUN/SS = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop
VREGULATED Regulated Voltage at IN+ VITH = 1.2V (Note 3) 0.596 0.600 0.604 V l 0.594 0.600 0.606 V LTC3731I l 0.591 0.609 V VSENSEMAX Maximum Current Sense Threshold VEAIN = 0.5V, VITH Open, 65 75 85 mV V – – – SENSE1 , VSENSE2 , VSENSE3 = 0.6V, 1.8V l 62 75 88 mV LTC3731I l 60 90 mV IMATCH Maximum Current Threshold Match Worst-Case Error at VSENSEMAX –5 5 % VLOADREG Output Voltage Load Regulation (Note 3) Measured in Servo Loop, ∆ITH Voltage = 1.2V to 0.7V l 0.1 0.5 % LTC3731I l 0.1 0.7 % Measured in Servo Loop, ∆ITH Voltage = 1.2V to 2V l –0.1 –0.5 % LTC3731I l –0.1 –0.7 % VREFLNREG Output Voltage Line Regulation VCC = 4.5V to 7V 0.03 %/V gm Transconductance Amplifier gm ITH = 1.2V, Sink/Source 25µA (Note 3) l 4 5 6 mmho LTC3731I l 3 5 7 mmho gmOL Transconductance Amplifier GBW ITH = 1.2V (gm • ZL, ZL = Series 1k-100kΩ-1nF) 3 MHz VFCB Forced Continuous Threshold l 0.58 0.60 0.62 V LTC3731I l 0.54 0.60 0.66 V IFCB FCB Bias Current VFCB = 0.65V 0.2 0.7 µA VBINHIBIT Burst Inhibit Threshold Measured at FCB Pin VCC – 1.5 VCC – 0.7 VCC – 0.3 V UVR Undervoltage RUN/SS Reset VCC Lowered Until the RUN/SS Pin is Pulled Low 3.3 3.8 4.5 V UVADJ Undervoltage Lockout Threshold 1.13 1.18 1.23 V IUVADJ Undervoltage Bias Current At UVADJ Threshold 0.2 50 nA IQ Input DC Supply Current (Note 4) Normal Mode VCC = 5V 2.3 3.5 mA Shutdown VRUN/SS = 0V 50 100 µA IRUN/SS Soft-Start Charge Current VRUN/SS = 1.9V –0.8 –1.5 –2.5 µA 3731fc 3 Document Outline Features Applications Features Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3731CG#PBF LTC3731CG#TRPBF LTC3731CG 36-Lead Plastic SSOP 0°C to 70°C LTC3731IG#PBF LTC3731IG#TRPBF LTC3731IG 36-Lead Plastic SSOP –40°C to 85°C LTC3731CUH#PBF LTC3731CUH#TRPBF 3731 32-Lead (5mm × 5mm) Plastic QFN 0°C to 70°C LTC3731IUH#PBF LTC3731IUH#TRPBF 3731I 32-Lead (5mm × 5mm) Plastic QFN –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = VRUN/SS = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop
VREGULATED Regulated Voltage at IN+ VITH = 1.2V (Note 3) 0.596 0.600 0.604 V l 0.594 0.600 0.606 V LTC3731I l 0.591 0.609 V VSENSEMAX Maximum Current Sense Threshold VEAIN = 0.5V, VITH Open, 65 75 85 mV V – – – SENSE1 , VSENSE2 , VSENSE3 = 0.6V, 1.8V l 62 75 88 mV LTC3731I l 60 90 mV IMATCH Maximum Current Threshold Match Worst-Case Error at VSENSEMAX –5 5 % VLOADREG Output Voltage Load Regulation (Note 3) Measured in Servo Loop, ∆ITH Voltage = 1.2V to 0.7V l 0.1 0.5 % LTC3731I l 0.1 0.7 % Measured in Servo Loop, ∆ITH Voltage = 1.2V to 2V l –0.1 –0.5 % LTC3731I l –0.1 –0.7 % VREFLNREG Output Voltage Line Regulation VCC = 4.5V to 7V 0.03 %/V gm Transconductance Amplifier gm ITH = 1.2V, Sink/Source 25µA (Note 3) l 4 5 6 mmho LTC3731I l 3 5 7 mmho gmOL Transconductance Amplifier GBW ITH = 1.2V (gm • ZL, ZL = Series 1k-100kΩ-1nF) 3 MHz VFCB Forced Continuous Threshold l 0.58 0.60 0.62 V LTC3731I l 0.54 0.60 0.66 V IFCB FCB Bias Current VFCB = 0.65V 0.2 0.7 µA VBINHIBIT Burst Inhibit Threshold Measured at FCB Pin VCC – 1.5 VCC – 0.7 VCC – 0.3 V UVR Undervoltage RUN/SS Reset VCC Lowered Until the RUN/SS Pin is Pulled Low 3.3 3.8 4.5 V UVADJ Undervoltage Lockout Threshold 1.13 1.18 1.23 V IUVADJ Undervoltage Bias Current At UVADJ Threshold 0.2 50 nA IQ Input DC Supply Current (Note 4) Normal Mode VCC = 5V 2.3 3.5 mA Shutdown VRUN/SS = 0V 50 100 µA IRUN/SS Soft-Start Charge Current VRUN/SS = 1.9V –0.8 –1.5 –2.5 µA 3731fc 3 Document Outline Features Applications Features Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
