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  4. Step-Down (Buck) Regulators
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  6. LTC3828

Data Sheet
PDF
JP
User Guides
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Overview

Features and Benefits

  • Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • Tracking for Both Outputs
  • Constant Frequency Current Mode Control
  • Wide VIN Range: 4.5V to 28V Operation
  • Power Good Output Voltage Indicator
  • Adjustable Soft-Start Current Ramping
  • Foldback Output Current Limiting-Disabled at Start-Up
  • No Reverse Current During Soft-Start Interval
  • Clock Output for 3-, 4-, 6-Phase Operation
  • Dual N-Channel MOSFET Synchronous Drive
  • ±1% Output Voltage Accuracy
  • Phase-Lockable Fixed Frequency 260kHz to 550kHz
  • OPTI-LOOP® Compensation Minimizes COUT
  • Very Low Dropout Operation: 99% Duty Cycle
  • Output Overvoltage Protection
  • Small 28-Lead SSOP and 5mm × 5mm QFN Packages

Product Details

The LTC3828 is a dual high performance step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows for a phase-lockable frequency of up to 550kHz. The TRCKSS pin provides both soft-start and tracking functions. Multiple LTC3828s can be daisy-chained in applications requiring more than two voltages to be tracked.

OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The precision 0.8V reference and power good output indicator are compatible with a wide 4.5V to 28V (30V maximum) input supply range, encompassing all battery chemistries.

The RUN pins control their respective channels independently. The FCB/PLLIN pin selects among Burst Mode® operation, skip-cycle mode and continuous current mode. Current foldback limits MOSFET dissipation during short-circuit conditions. Reverse current and current foldback functions are disabled during soft-start.

Applications

  • Telecom Infrastructure
  • ASIC Power Supply
  • Industry Equipment

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Evaluation Kits (3)

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (3)
  • Design Notes (1)
  • Technical Articles (1)
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    Tools & Simulations

    LTspice

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    Product Recommendations

    LTC3828 Companion Parts

    Recommended Related Parts

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    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    LTC3828EG#PBF Material Declaration Reliability Data 28-Lead SSOP
    LTC3828EG#TRPBF Material Declaration Reliability Data 28-Lead SSOP
    LTC3828EUH#PBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
    LTC3828EUH#TRPBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
    Wafer Fabrication Data R384 Reliability Data

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    Select Model for PCN Information
    • LTC3828EG#PBF Production
    • LTC3828EG#TRPBF Production
    • LTC3828EUH#PBF Production
    • LTC3828EUH#TRPBF Production

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