Datasheet LTC7851, LTC7851-1 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Quad Output, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing |
| Pages / Page | 38 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Revision | A |
| File Format / Size | PDF / 4.2 Mb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
Model Line for this Datasheet
Text Version of Document
LTC7851/LTC7851-1
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). VCC = 5V, VRUN1,2,3,4 = 5V, VFREQ = VCLKIN = 0V, VFB = 0.6V, fOSC = 600kHz, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VINSNS VIN Sense Range VCC = 5V (Note 5) l 3 27 V VCC VCC Voltage Range l 3 5.5 V VOUT VOUT Voltage Range Limited by ISNSP/N Common Mode l 0.6 VCC – 0.5 V Voltage Range (Note 3) IQ Input Voltage Supply Current Normal Operation VRUN1,2,3,4 = 5V 60 110 mA Shutdown Mode VRUN1,2,3,4 = 0V 100 µA UVLO VCC < VUVLO 16 mA VRUN RUN Input Threshold VRUN Rising 1.95 2.25 2.45 V VRUN Hysteresis 250 mV IRUN RUN Input Pull-Up Current VRUN = 2.4V 1.5 µA VUVLO Undervoltage Lockout Threshold VCC Rising l 3 V VCC Hysteresis 100 mV ISS Soft-Start Pin Output Current VSS = 0V 1.5 2.5 3.5 µA tSS Internal Soft-Start Time 1.5 ms VFB Regulated Feedback Voltage –20°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 18.5 20 21.5 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 4 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
VDA VSNSP Accuracy Measured in a Servo Loop with EA in Loop 594 600 606 mV 0°C to 85°C Measured in a Servo Loop with EA in Loop l 592 600 608 mV –40°C to 125°C IDIFF+ Input Bias Current VSNSP = 600mV –100 100 nA fOdb DA Unity-Gain Bandwidth (Note 4) 40 MHz IOUT(SINK) Maximum Sinking Current VSNSOUT = 600mV 100 µA IOUT(SOURCE) Maximum Sourcing Current VSNSOUT = 600mV 500 µA Rev A For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions 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). VCC = 5V, VRUN1,2,3,4 = 5V, VFREQ = VCLKIN = 0V, VFB = 0.6V, fOSC = 600kHz, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VINSNS VIN Sense Range VCC = 5V (Note 5) l 3 27 V VCC VCC Voltage Range l 3 5.5 V VOUT VOUT Voltage Range Limited by ISNSP/N Common Mode l 0.6 VCC – 0.5 V Voltage Range (Note 3) IQ Input Voltage Supply Current Normal Operation VRUN1,2,3,4 = 5V 60 110 mA Shutdown Mode VRUN1,2,3,4 = 0V 100 µA UVLO VCC < VUVLO 16 mA VRUN RUN Input Threshold VRUN Rising 1.95 2.25 2.45 V VRUN Hysteresis 250 mV IRUN RUN Input Pull-Up Current VRUN = 2.4V 1.5 µA VUVLO Undervoltage Lockout Threshold VCC Rising l 3 V VCC Hysteresis 100 mV ISS Soft-Start Pin Output Current VSS = 0V 1.5 2.5 3.5 µA tSS Internal Soft-Start Time 1.5 ms VFB Regulated Feedback Voltage –20°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 18.5 20 21.5 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 4 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
VDA VSNSP Accuracy Measured in a Servo Loop with EA in Loop 594 600 606 mV 0°C to 85°C Measured in a Servo Loop with EA in Loop l 592 600 608 mV –40°C to 125°C IDIFF+ Input Bias Current VSNSP = 600mV –100 100 nA fOdb DA Unity-Gain Bandwidth (Note 4) 40 MHz IOUT(SINK) Maximum Sinking Current VSNSOUT = 600mV 100 µA IOUT(SOURCE) Maximum Sourcing Current VSNSOUT = 600mV 500 µA Rev A For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
