Datasheet LTC3861-1 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing |
| Pages / Page | 38 / 3 — e lecTrical characTerisTics The. denotes the specifications which apply … |
| File Format / Size | PDF / 1.3 Mb |
| Document Language | English |
e lecTrical characTerisTics The. denotes the specifications which apply over the specified operating
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LTC3861-1
e lecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TJ = 25°C (Note 3). VCC = 5V, VRUN1,2 = 5V, VFREQ = 5V, VCLKIN = 0V, VFB = 0.6V, fOSC = 0.6MHz, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN VIN Range VCC = 5V l 3 24 V VCC VCC Voltage Range l 3 5.5 V IQ Input Voltage Supply Current Normal Operation VRUN1,2 = 5V 18 mA Shutdown Mode VRUN1,2 = 0V 50 µA UVLO VCC < VUVLO 6 mA VRUN RUN Input Threshold VRUN Rising 1.95 2.25 2.45 V VRUN Hysteresis 250 mV IRUN RUN Input Pull-Up Current VRUN1,2 = 2.4V 1.5 µA VUVLO Undervoltage Lockout Threshold VCC Rising l 3.0 V VCC Hysteresis 100 mV ISS Soft-Start Pin Output Current VSS = 0V 2.5 µA tSS(INTERNAL) Internal Soft-Start Time 1.5 ms VFB Regulated Feedback Voltage –40°C to 85°C 595.5 600 604.5 mV –40°C to 125°C l 594 600 606 mV ∆VFB/∆VCC Regulated Feedback Voltage Line Dependence 3.0V < VCC < 5.5V 0.05 0.2 %/V ILIMIT ILIM Pin Output Current VILIM = 0.8V 19 20 22 µA
Power Good
VFB(OV) PGOOD/VFB Overvoltage Threshold VFB Falling 645 mV VFB Rising 650 660 670 mV VFB(UV) PGOOD/VFB Undervoltage Threshold VFB Falling 530 540 550 mV VFB Rising 555 mV VPGOOD(ON) PGOOD Pull-Down Resistance 15 60 Ω IPGOOD(OFF) PGOOD Leakage Current VPGOOD = 5V 2 µA tPGOOD PGOOD Delay VPGOOD High to Low 30 µs
Error Amplifier
IFB FB Pin Input Current VFB = 600mV –100 100 nA IOUT COMP Pin Output Current Sourcing 1 mA Sinking 5 mA AV(OL) Open-Loop Voltage Gain 75 dB SR Slew Rate (Note 4) 45 V/µs f0dB COMP Unity-Gain Bandwidth (Note 4) 40 MHz
Differential Amplifier
AV Differential Amplifier Voltage Gain VVSNSN = 0V l 1.007 1 0.993 V/V VOS Input Referred Offset VVSNSN = 0V –2 2 mV f0dB DA Unity-Gain Crossover Frequency (Note 4) 40 MHz IOUT(SINK) Maximum Sinking Current DIFFOUT = 1.2V 100 µA IOUT(SOURCE) Maximum Sourcing Current DIFFOUT = 1.2V 500 µA VSNSOUT(MAX) Maximum Output Voltage 4 V
Current Sense Amplifier
VISENSE(MAX) Maximum Differential Current Sense Voltage 50 mV (VISNSP-VISNSN) AV(ISENSE) Voltage Gain 18.5 V/V VCM(ISENSE) Input Common Mode Range –0.3 VCC – 0.5 V 38611fb For more information www.linear.com/LTC3861-1 3 Document Outline Features Applications 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 Related Parts
e lecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TJ = 25°C (Note 3). VCC = 5V, VRUN1,2 = 5V, VFREQ = 5V, VCLKIN = 0V, VFB = 0.6V, fOSC = 0.6MHz, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN VIN Range VCC = 5V l 3 24 V VCC VCC Voltage Range l 3 5.5 V IQ Input Voltage Supply Current Normal Operation VRUN1,2 = 5V 18 mA Shutdown Mode VRUN1,2 = 0V 50 µA UVLO VCC < VUVLO 6 mA VRUN RUN Input Threshold VRUN Rising 1.95 2.25 2.45 V VRUN Hysteresis 250 mV IRUN RUN Input Pull-Up Current VRUN1,2 = 2.4V 1.5 µA VUVLO Undervoltage Lockout Threshold VCC Rising l 3.0 V VCC Hysteresis 100 mV ISS Soft-Start Pin Output Current VSS = 0V 2.5 µA tSS(INTERNAL) Internal Soft-Start Time 1.5 ms VFB Regulated Feedback Voltage –40°C to 85°C 595.5 600 604.5 mV –40°C to 125°C l 594 600 606 mV ∆VFB/∆VCC Regulated Feedback Voltage Line Dependence 3.0V < VCC < 5.5V 0.05 0.2 %/V ILIMIT ILIM Pin Output Current VILIM = 0.8V 19 20 22 µA
Power Good
VFB(OV) PGOOD/VFB Overvoltage Threshold VFB Falling 645 mV VFB Rising 650 660 670 mV VFB(UV) PGOOD/VFB Undervoltage Threshold VFB Falling 530 540 550 mV VFB Rising 555 mV VPGOOD(ON) PGOOD Pull-Down Resistance 15 60 Ω IPGOOD(OFF) PGOOD Leakage Current VPGOOD = 5V 2 µA tPGOOD PGOOD Delay VPGOOD High to Low 30 µs
Error Amplifier
IFB FB Pin Input Current VFB = 600mV –100 100 nA IOUT COMP Pin Output Current Sourcing 1 mA Sinking 5 mA AV(OL) Open-Loop Voltage Gain 75 dB SR Slew Rate (Note 4) 45 V/µs f0dB COMP Unity-Gain Bandwidth (Note 4) 40 MHz
Differential Amplifier
AV Differential Amplifier Voltage Gain VVSNSN = 0V l 1.007 1 0.993 V/V VOS Input Referred Offset VVSNSN = 0V –2 2 mV f0dB DA Unity-Gain Crossover Frequency (Note 4) 40 MHz IOUT(SINK) Maximum Sinking Current DIFFOUT = 1.2V 100 µA IOUT(SOURCE) Maximum Sourcing Current DIFFOUT = 1.2V 500 µA VSNSOUT(MAX) Maximum Output Voltage 4 V
Current Sense Amplifier
VISENSE(MAX) Maximum Differential Current Sense Voltage 50 mV (VISNSP-VISNSN) AV(ISENSE) Voltage Gain 18.5 V/V VCM(ISENSE) Input Common Mode Range –0.3 VCC – 0.5 V 38611fb For more information www.linear.com/LTC3861-1 3 Document Outline Features Applications 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 Related Parts
