Datasheet Linear Technology LTC3855

ManufacturerLinear Technology
SeriesLTC3855

Dual, Multiphase Synchronous DC/DC Controller with Differential Remote Sense

Datasheets

Datasheet LTC3855
PDF, 2.2 Mb, Language: en, File uploaded: Sep 23, 2017, Pages: 44
Dual, Multiphase Synchronous DC/DC Controller with Differential Remote Sense
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Prices

Packaging

LTC3855EFE#PBFLTC3855EFE#TRPBFLTC3855EUJ#PBFLTC3855EUJ#TRPBFLTC3855IFE#PBFLTC3855IFE#TRPBFLTC3855IUJ#PBFLTC3855IUJ#TRPBF
N12345678
PackageTSSOP-38
Package Outline Drawing
TSSOP-38
Package Outline Drawing
6x6 QFN-40
Package Outline Drawing
6x6 QFN-40
Package Outline Drawing
TSSOP-38
Package Outline Drawing
TSSOP-38
Package Outline Drawing
6x6 QFN-40
Package Outline Drawing
6x6 QFN-40
Package Outline Drawing
Package CodeFEFEUJUJFEFEUJUJ
Package Index05-08-177205-08-177205-08-172805-08-172805-08-177205-08-177205-08-172805-08-1728
Pin Count3838404038384040

Parametrics

Parameters / ModelsLTC3855EFE#PBFLTC3855EFE#TRPBFLTC3855EUJ#PBFLTC3855EUJ#TRPBFLTC3855IFE#PBFLTC3855IFE#TRPBFLTC3855IUJ#PBFLTC3855IUJ#TRPBF
ArchitectureConstant Frequency Current ModeConstant Frequency Current ModeConstant Frequency Current ModeConstant Frequency Current ModeConstant Frequency Current ModeConstant Frequency Current ModeConstant Frequency Current ModeConstant Frequency Current Mode
Demo BoardsDC1441A,DC1586A,DC1617A-A,DC1617A-BDC1441A,DC1586A,DC1617A-A,DC1617A-BDC1441A,DC1586A,DC1617A-A,DC1617A-BDC1441A,DC1586A,DC1617A-A,DC1617A-BDC1441A,DC1586A,DC1617A-A,DC1617A-BDC1441A,DC1586A,DC1617A-A,DC1617A-BDC1441A,DC1586A,DC1617A-A,DC1617A-BDC1441A,DC1586A,DC1617A-A,DC1617A-B
Design ToolsLTspice File,LTpowerCAD FileLTspice File,LTpowerCAD FileLTspice File,LTpowerCAD FileLTspice File,LTpowerCAD FileLTspice File,LTpowerCAD FileLTspice File,LTpowerCAD FileLTspice File,LTpowerCAD FileLTspice File,LTpowerCAD File
Export Controlnononononononono
FeaturesDifferential Remote Sense, PolyPhase, DCR Current Sense, Tracking, External SynchronizationDifferential Remote Sense, PolyPhase, DCR Current Sense, Tracking, External SynchronizationDifferential Remote Sense, PolyPhase, DCR Current Sense, Tracking, External SynchronizationDifferential Remote Sense, PolyPhase, DCR Current Sense, Tracking, External SynchronizationDifferential Remote Sense, PolyPhase, DCR Current Sense, Tracking, External SynchronizationDifferential Remote Sense, PolyPhase, DCR Current Sense, Tracking, External SynchronizationDifferential Remote Sense, PolyPhase, DCR Current Sense, Tracking, External SynchronizationDifferential Remote Sense, PolyPhase, DCR Current Sense, Tracking, External Synchronization
Frequency, kHz770770770770770770770770
Frequency Sync Range250kHz - 770kHz250kHz - 770kHz250kHz - 770kHz250kHz - 770kHz250kHz - 770kHz250kHz - 770kHz250kHz - 770kHz250kHz - 770kHz
Integrated Inductornononononononono
Ishutdown, µA3030303030303030
Isupply, mA3.53.53.53.53.53.53.53.5
Max Phases2, 3, 4, 6, 122, 3, 4, 6, 122, 3, 4, 6, 122, 3, 4, 6, 122, 3, 4, 6, 122, 3, 4, 6, 122, 3, 4, 6, 122, 3, 4, 6, 12
Monolithicnononononononono
Number of Outputs22222222
Operating Temperature Range, °C0 to 850 to 850 to 850 to 85-40 to 85-40 to 85-40 to 85-40 to 85
Output Current, A3030303030303030
Output Current 2, A3030303030303030
Polyphaseyesyesyesyesyesyesyesyes
Sense ResistorRsense, DCRRsense, DCRRsense, DCRRsense, DCRRsense, DCRRsense, DCRRsense, DCRRsense, DCR
Switch Current, A3030303030303030
Switch Current 2, A3030303030303030
Synchronousyesyesyesyesyesyesyesyes
TopologyBuckBuckBuckBuckBuckBuckBuckBuck
Topology 1BuckBuckBuckBuckBuckBuckBuckBuck
Topology 2BuckBuckBuckBuckBuckBuckBuckBuck
Vin Max, V3838383838383838
Vin Min, V4.54.54.54.54.54.54.54.5
Vout Max, V12.512.512.512.512.512.512.512.5
Vout Maximum12.5V12.5V12.5V12.5V12.5V12.5V12.5V12.5V
Vout Min, V0.60.60.60.60.60.60.60.6
Vout Min 2, V0.60.60.60.60.60.60.60.6
Vref Accuracy Over Temp, %0.750.750.750.750.750.750.750.75

Eco Plan

LTC3855EFE#PBFLTC3855EFE#TRPBFLTC3855EUJ#PBFLTC3855EUJ#TRPBFLTC3855IFE#PBFLTC3855IFE#TRPBFLTC3855IUJ#PBFLTC3855IUJ#TRPBF
RoHSCompliantCompliantCompliantCompliantCompliantCompliantCompliantCompliant

Application Notes

  • PCB Layout Considerations for Non-Isolated Switching Power Supplies &mdash AN136
    PDF, 215 Kb, File published: Sep 20, 2012
    The best news when you power up a prototype supply board for the very first time is when it not only works, but also runs quiet and cool. Unfortunately, this does not always happen. A common problem of switching power supplies is “unstable” switching waveforms. Sometimes, waveform jittering is so pronounced that audible noise can be heard from the magnetic components. If the problem is related to the printed circuit board (PCB) layout, identifying the cause can be difficult. This is why proper PCB layout at the early stage of a switching supply design is very critical. Its importance cannot be overstated.
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  • Modeling and Loop Compensation Design of Switching Mode Power Supplies &mdash AN149
    PDF, 1.4 Mb, File published: Mar 23, 2015
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Design Notes

  • Dual Output Step-Down Controller Produces Accurate, Efficient and Reliable High Current Rails &mdash DN478
    PDF, 84 Kb, File published: Mar 23, 2010
    Extract from the document

Articles

  • 6mm × 6mm DC/DC Controller for High Current DCR Sensing Applications &mdash LT Journal
    PDF, 494 Kb, File published: Apr 1, 2010
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Model Line

Manufacturer's Classification

  • Power Management > Switching Regulator > Step-Down (Buck) Regulators > Multiple Output Buck | External Power Switch Buck Controllers
EMS supplier