Datasheet LTC3614 (Analog Devices) - 3
| Hersteller | Analog Devices |
| Beschreibung | 4A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter |
| Seiten / Seite | 30 / 3 — e lecTrical characTerisTics The. denotes the specifications which apply … |
| Dateiformat / Größe | PDF / 808 Kb |
| Dokumentensprache | Englisch |
e lecTrical characTerisTics The. denotes the specifications which apply over the specified operating
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LTC3614
e lecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 3.3V, RT/SYNC = SVIN unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Operating Voltage Range l 2.25 5.5 V VUVLO Undervoltage Lockout Threshold SVIN Ramping Down l 1.7 V SVIN Ramping Up l 2.25 V VFB Feedback Voltage Internal Reference (Note 3) VTRACK = SVIN, VDDR = 0V 0°C < TJ < 85°C 0.594 0.6 0.606 V –40°C < TJ < 125°C l 0.591 0.609 V –55°C < TJ < 150°C l 0.589 0.609 V Feedback Voltage External Reference (Note 3) VTRACK = 0.3V, VDDR = SVIN 0.288 0.300 0.312 V (Note 7) (Note 3) VTRACK = 0.5V, VDDR = SVIN 0.488 0.500 0.512 V IFB Feedback Input Current VFB = 0.6V l ±30 nA ∆VLINEREG Line Regulation SVIN = PVIN = 2.25V to 5.5V (Notes 3, 4) TRACK/SS = SVIN –40°C < TJ < 125°C l 0.2 %/V –55°C < TJ < 150°C l 0.3 %/V ∆VLOADREG Load Regulation ITH from 0.5V to 0.8V (Notes 3, 4) 0.25 % VITH = SVIN (Note 5) 2.6 % IS Active Mode Supply Current VFB = 0.5V, VMODE = SVIN (Note 6) 1100 µA Sleep Mode Supply Current VFB = 0.7V, VMODE = 0V, ITH = SVIN 75 100 µA (Note 5) VFB = 0.7V, VMODE = 0V (Note 4) 130 175 µA Shutdown Current SVIN = PVIN = 5.5V, VRUN = 0V 0.1 1 µA RDS(ON) Top Switch On-Resistance PVIN = 3.3V (Note 10) 35 mΩ Bottom Switch On-Resistance PVIN = 3.3V (Note 10) 25 mΩ ILIM Top Switch Current Limit Sourcing (Note 8), VFB = 0.5V Duty Cycle <35% 7.5 9 10.5 A Duty Cycle = 100% 5 A Bottom Switch Current Limit Sinking (Note 8), VFB = 0.7V, –6 –8 –11 A Forced Continuous Mode gm(EA) Error Amplifier Transconductance –5µA < IITH < 5µA (Note 4) 200 µS IEAO Error Amplifier Maximum Output (Note 4) ±30 µA Current tSS Internal Soft-Start Time VFB from 0.06V to 0.54V, 0.65 1.2 1.9 ms TRACK/SS = SVIN VTRACK/SS Enable Internal Soft-Start (Note 7 ) 0.62 V tTRACK/SS_DIS Soft-Start Discharge Time at Start-Up 60 µs RON(TRACK/SS_DIS) TRACK/SS Pull-Down Resistor at 200 Ω Start-Up fOSC Oscillator Frequency RT/SYNC = 370k l 0.8 1 1.2 MHz Internal Oscillator Frequency VRT/SYNC = SVIN l 1.8 2.25 2.7 MHz fSYNC Synchronization Frequency Range 0.3 4 MHz VRT/SYNC SYNC Input Threshold High 1.2 V SYNC Input Threshold Low . 0.3 V ISW(LKG) Switch Leakage Current SVIN = PVIN = 5.5V, VRUN = 0V 0.1 1 µA VDDR DDR Option Enable Voltage SVIN – 0.3 V 3614fc For more information www.linear.com/LTC3614 3 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Block Diagram Operation Applications Information Package Description Typical Application Related Parts
e lecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 3.3V, RT/SYNC = SVIN unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Operating Voltage Range l 2.25 5.5 V VUVLO Undervoltage Lockout Threshold SVIN Ramping Down l 1.7 V SVIN Ramping Up l 2.25 V VFB Feedback Voltage Internal Reference (Note 3) VTRACK = SVIN, VDDR = 0V 0°C < TJ < 85°C 0.594 0.6 0.606 V –40°C < TJ < 125°C l 0.591 0.609 V –55°C < TJ < 150°C l 0.589 0.609 V Feedback Voltage External Reference (Note 3) VTRACK = 0.3V, VDDR = SVIN 0.288 0.300 0.312 V (Note 7) (Note 3) VTRACK = 0.5V, VDDR = SVIN 0.488 0.500 0.512 V IFB Feedback Input Current VFB = 0.6V l ±30 nA ∆VLINEREG Line Regulation SVIN = PVIN = 2.25V to 5.5V (Notes 3, 4) TRACK/SS = SVIN –40°C < TJ < 125°C l 0.2 %/V –55°C < TJ < 150°C l 0.3 %/V ∆VLOADREG Load Regulation ITH from 0.5V to 0.8V (Notes 3, 4) 0.25 % VITH = SVIN (Note 5) 2.6 % IS Active Mode Supply Current VFB = 0.5V, VMODE = SVIN (Note 6) 1100 µA Sleep Mode Supply Current VFB = 0.7V, VMODE = 0V, ITH = SVIN 75 100 µA (Note 5) VFB = 0.7V, VMODE = 0V (Note 4) 130 175 µA Shutdown Current SVIN = PVIN = 5.5V, VRUN = 0V 0.1 1 µA RDS(ON) Top Switch On-Resistance PVIN = 3.3V (Note 10) 35 mΩ Bottom Switch On-Resistance PVIN = 3.3V (Note 10) 25 mΩ ILIM Top Switch Current Limit Sourcing (Note 8), VFB = 0.5V Duty Cycle <35% 7.5 9 10.5 A Duty Cycle = 100% 5 A Bottom Switch Current Limit Sinking (Note 8), VFB = 0.7V, –6 –8 –11 A Forced Continuous Mode gm(EA) Error Amplifier Transconductance –5µA < IITH < 5µA (Note 4) 200 µS IEAO Error Amplifier Maximum Output (Note 4) ±30 µA Current tSS Internal Soft-Start Time VFB from 0.06V to 0.54V, 0.65 1.2 1.9 ms TRACK/SS = SVIN VTRACK/SS Enable Internal Soft-Start (Note 7 ) 0.62 V tTRACK/SS_DIS Soft-Start Discharge Time at Start-Up 60 µs RON(TRACK/SS_DIS) TRACK/SS Pull-Down Resistor at 200 Ω Start-Up fOSC Oscillator Frequency RT/SYNC = 370k l 0.8 1 1.2 MHz Internal Oscillator Frequency VRT/SYNC = SVIN l 1.8 2.25 2.7 MHz fSYNC Synchronization Frequency Range 0.3 4 MHz VRT/SYNC SYNC Input Threshold High 1.2 V SYNC Input Threshold Low . 0.3 V ISW(LKG) Switch Leakage Current SVIN = PVIN = 5.5V, VRUN = 0V 0.1 1 µA VDDR DDR Option Enable Voltage SVIN – 0.3 V 3614fc For more information www.linear.com/LTC3614 3 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Block Diagram Operation Applications Information Package Description Typical Application Related Parts