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Datasheet Linear Technology LTC3861-1

ManufacturerLinear Technology
SeriesLTC3861-1

Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing

Datasheets

  • Download » Datasheet, PDF, 1.3 Mb, Revision: B, File uploaded 09-24-2017
    LTC3861-1 - Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing
    Docket ↓
    LTC3861-1
    Dual, Multiphase Step-Down
    Voltage Mode DC/DC Controller
    with Accurate Current Sharing
    Description Features Operates with Power Blocks, DrMOS or External
    Gate Drivers and MOSFETs
    n Constant-Frequency Voltage Mode Control with
    Accurate Current Sharing
    n ±0.75% 0.6V Voltage Reference
    n Differential Remote Output Voltage Sense Amplifier
    n Multiphase Capability—Up to 12-Phase Operatio Programmable Current Limit
    n Safely Powers a Prebiased Load
    n Programmable or PLL-Synchronizable Switching
    Frequency Up to 2.25MHz
    n Lossless Current Sensing Using Inductor DCR or
    Precision Current Sensing with Sense Resistor
    n V
    CC Range: 3V to 5.5V
    n V Range: 3V to 24V
    IN
    n Power Good Output Voltage Monitor
    n Output Voltage Tracking Capability
    n Programmable Soft-Start ...

Prices

Packaging

Parametrics

LTC3861EUH-1#PBFLTC3861EUH-1#TRPBFLTC3861IUH-1#PBFLTC3861IUH-1#TRPBF
ArchitectureConstant Frequency Voltage ModeConstant Frequency Voltage ModeConstant Frequency Voltage ModeConstant Frequency Voltage Mode
Design ToolsLTspice Model,LTpowerCAD ModelLTspice Model,LTpowerCAD ModelLTspice Model,LTpowerCAD ModelLTspice Model,LTpowerCAD Model
Export Controlnononono
FeaturesPolyPhase, External Synchronization, Resistor Set Frequency, DCR Current Sense, Power Good, Tracking, Soft StartPolyPhase, External Synchronization, Resistor Set Frequency, DCR Current Sense, Power Good, Tracking, Soft StartPolyPhase, External Synchronization, Resistor Set Frequency, DCR Current Sense, Power Good, Tracking, Soft StartPolyPhase, External Synchronization, Resistor Set Frequency, DCR Current Sense, Power Good, Tracking, Soft Start
Frequency, kHz2250225022502250
Frequency Adjust RangeUp to 2.25MHzUp to 2.25MHzUp to 2.25MHzUp to 2.25MHz
Frequency Sync RangeUp to 2.25MHzUp to 2.25MHzUp to 2.25MHzUp to 2.25MHz
Integrated Inductornononono
Ishutdown, A50505050
Isupply, mA30303030
Max Phases2, 3, 4, 6, 122, 3, 4, 6, 122, 3, 4, 6, 122, 3, 4, 6, 12
Monolithicnononono
Number of Outputs2222
Operating Temperature Range, °C0 to 850 to 85-40 to 85-40 to 85
Output Current, A40404040
Output Current 2, A40404040
Polyphaseyesyesyesyes
Sense ResistorRsense, DCRRsense, DCRRsense, DCRRsense, DCR
Switch Current, A40404040
Switch Current 2, A40404040
Synchronousyesyesyesyes
TopologyBuckBuckBuckBuck
Topology 1BuckBuckBuckBuck
Topology 2BuckBuckBuckBuck
Vin Max, V24242424
Vin Min, V3333
Vout Max, V5.55.55.55.5
Vout Maximum5.5V5.5V5.5V5.5V
Vout Min, V0.60.60.60.6
Vref Accuracy Over Temp, %0.750.750.750.75

Eco Plan

Application Notes

  • Download » Application Notes - AN149, PDF, 1.4 Mb, 03-23-2015
    Modeling and Loop Compensation Design of Switching Mode Power Supplies
    Docket ↓
    Application Note 149
    January 2015
    Modeling and Loop Compensation Design of
    Switching Mode Power Supplies
    Henry J. Zhang
    Introduction Identifying The Problem Today’s electronic systems are becoming more and more
    complex, with an increasing number of power rails and
    supplies. To achieve optimum power solution density,
    reliability and cost, often system designers need to design
    their own power solutions, instead of just using commercial power supply bricks. Designing and optimizing high
    performance switching mode power supplies is becoming
    a more frequent and challenging task. A well-designed switching mode power supply (SMPS)
    must be quiet, both electrically and acoustically. An undercompensated system may result in unstable operations.
    Typical symptoms of an unstable power supply include:
    audible noise from the magnetic components or ceramic
    capacitors, jittering in the switching waveforms, oscillation
    of output voltage, overheating of power FETs and so on. Power supply loop compensation design is usually
    viewed as a difficult task, especially for inexperienced
    supply designers. Practical compensation design typically
    involves numerous iterations on the value adjustment
    of the compensation components. This is not only time
    consuming, but is also inaccurate in a complicated
    system whose supply bandwidth and stability margin ...

Moldel Line

Series: LTC3861-1 (4)

Manufacturer's Classification

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

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