Datasheet LTC3774 (Analog Devices) - 3
| Hersteller | Analog Devices |
| Beschreibung | Dual, Multiphase Current Mode Synchronous Controller for Sub-Milliohm DCR Sensing |
| Seiten / Seite | 38 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Dateiformat / Größe | PDF / 426 Kb |
| Dokumentensprache | Englisch |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
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LTC3774
ELECTRICAL 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 = 15V, VRUN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop/Whole System
VIN Input Voltage Range 4.5 38 V VOUT Output Voltage Range l 0.6 3.5 V V + OSNS Regulated Feedback Voltage ITH = 1.2V (Note 3) l 595.5 600 604.5 mV I + OSNS Feedback Current –30 –100 nA VREFLNREG Reference Voltage Line Regulation VIN = 4.5V to 38V 0.002 0.01 %/V VLOADREG Output Voltage Load Regulation ∆ITH = 1.2V to 0.7V l 0.01 0.1 % ∆ITH = 1.2V to 1.6V l 0.01 0.1 % gm Transconductance Amplifier gm ITH = 1.2V, Sink/Source 5µA 2 mmho f0dB DA Unity-Gain Crossover Frequency (Note 5) 4 MHz V + OVL Feedback Overvoltage Lockout Measured at VOSNS l 5 7.5 10 % IQ Input DC Supply Current (Note 4) Normal Mode 9 mA Shutdown VRUN = 0V 40 60 µA DFMAX Maximum Duty Factor In Dropout 96 98 % UVLO Undervoltage Lockout VINTVCC Falling 3.5 3.75 4.0 V UVLOHYS UVLO Hysteresis 500 mV I + + SNSA Sense Pin Bias Currents VSNSA = 3.3V ±0.5 ±2 µA I + + SNSD Sense Pin Bias Currents VSNSD = 3.3V 30 nA I – – SNS Sense Pin Bias Currents VSNS = 3.3V 10 µA AVT_SNS Total Sense Signal Gain to Current 5 V/V Comparator ITEMP DCR Tempco Compensation Current VITEMP = 0.5V l 27 30 33 µA ITK/SS Soft-Start Charge Current VTK/SS = 0V l 1 1.25 1.5 µA tSS(INTERNAL) Internal Soft-Start Time VTK/SS = 5V 600 µs VHIZB HIZB Pin On Threshold VHIZB Rising 2.2 V VHIZB_HYS HIZB Pin On Hysteresis 600 mV VRUN RUN Pin On Threshold VRUN Rising l 1.1 1.22 1.34 V VRUN_HYS RUN Pin On Hysteresis 80 mV IRUN RUN Pin Pull-Up Current RUN < On Threshold RUN < 1.1V 1 µA RUN > On Threshold RUN > 1.34V 5 µA VSENSE(MAX) Maximum Current Sense Threshold ITH = 2V, VSNS– = 3.3V ILIM = 0V l 9.25 10.25 11.25 mV ILIM = 1/4 INTVCC l 14 15 16 mV ILIM = Float l 19 20 21 mV ILIM = 3/4 INTVCC l 24 25 26 mV ILIM = INTVCC l 28.25 29.75 31.25 mV
Power Good
VPGOOD(ON) PGOOD Pull-Down Resistance 90 200 Ω IPGOOD(OFF) PGOOD Leakage Current VPGOOD = 5V –2 2 µA tPGOOD VPGOOD High to Low Delay 45 µs VPGOOD PGOOD Trip Level VOSNS+ with Respect to Set Output Voltage VOSNS+ Ramping Up 5 7.5 10 % VOSNS+ Ramping Down –5 –7.5 –10 % 3774fc For more information www.linear.com/LTC3774 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
ELECTRICAL 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 = 15V, VRUN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop/Whole System
VIN Input Voltage Range 4.5 38 V VOUT Output Voltage Range l 0.6 3.5 V V + OSNS Regulated Feedback Voltage ITH = 1.2V (Note 3) l 595.5 600 604.5 mV I + OSNS Feedback Current –30 –100 nA VREFLNREG Reference Voltage Line Regulation VIN = 4.5V to 38V 0.002 0.01 %/V VLOADREG Output Voltage Load Regulation ∆ITH = 1.2V to 0.7V l 0.01 0.1 % ∆ITH = 1.2V to 1.6V l 0.01 0.1 % gm Transconductance Amplifier gm ITH = 1.2V, Sink/Source 5µA 2 mmho f0dB DA Unity-Gain Crossover Frequency (Note 5) 4 MHz V + OVL Feedback Overvoltage Lockout Measured at VOSNS l 5 7.5 10 % IQ Input DC Supply Current (Note 4) Normal Mode 9 mA Shutdown VRUN = 0V 40 60 µA DFMAX Maximum Duty Factor In Dropout 96 98 % UVLO Undervoltage Lockout VINTVCC Falling 3.5 3.75 4.0 V UVLOHYS UVLO Hysteresis 500 mV I + + SNSA Sense Pin Bias Currents VSNSA = 3.3V ±0.5 ±2 µA I + + SNSD Sense Pin Bias Currents VSNSD = 3.3V 30 nA I – – SNS Sense Pin Bias Currents VSNS = 3.3V 10 µA AVT_SNS Total Sense Signal Gain to Current 5 V/V Comparator ITEMP DCR Tempco Compensation Current VITEMP = 0.5V l 27 30 33 µA ITK/SS Soft-Start Charge Current VTK/SS = 0V l 1 1.25 1.5 µA tSS(INTERNAL) Internal Soft-Start Time VTK/SS = 5V 600 µs VHIZB HIZB Pin On Threshold VHIZB Rising 2.2 V VHIZB_HYS HIZB Pin On Hysteresis 600 mV VRUN RUN Pin On Threshold VRUN Rising l 1.1 1.22 1.34 V VRUN_HYS RUN Pin On Hysteresis 80 mV IRUN RUN Pin Pull-Up Current RUN < On Threshold RUN < 1.1V 1 µA RUN > On Threshold RUN > 1.34V 5 µA VSENSE(MAX) Maximum Current Sense Threshold ITH = 2V, VSNS– = 3.3V ILIM = 0V l 9.25 10.25 11.25 mV ILIM = 1/4 INTVCC l 14 15 16 mV ILIM = Float l 19 20 21 mV ILIM = 3/4 INTVCC l 24 25 26 mV ILIM = INTVCC l 28.25 29.75 31.25 mV
Power Good
VPGOOD(ON) PGOOD Pull-Down Resistance 90 200 Ω IPGOOD(OFF) PGOOD Leakage Current VPGOOD = 5V –2 2 µA tPGOOD VPGOOD High to Low Delay 45 µs VPGOOD PGOOD Trip Level VOSNS+ with Respect to Set Output Voltage VOSNS+ Ramping Up 5 7.5 10 % VOSNS+ Ramping Down –5 –7.5 –10 % 3774fc For more information www.linear.com/LTC3774 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts