LTC3854

PRODUCTION

Small Footprint, Wide VIN Range Synchronous Step-Down DC/DC Controller

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    Part Details

    • Wide Operating VIN Range: 4.5V to 38V
    • RSENSE or DCR Current Sensing
    • ±1% 0.8V Reference Accuracy Over Temperature
    • 400kHz Switching Frequency
    • Dual N-channel MOSFET Synchronous Drive
    • Very Low Dropout Operation: 97% Duty Cycle
    • Starts Up Into Pre-Biased Output
    • Adjustable Output Voltage Soft-Start
    • Output Current Foldback Limiting (Disabled During Soft-Start)
    • Output Overvoltage Protection
    • 5V LDO for External Gate Drive
    • OPTI-LOOP® Compensation Minimizes COUT
    • Low Shutdown IQ: 15μA
    • Tiny Thermally Enhanced 12-Pin 2mm × 3mm DFN and MSOP Packages
    LTC3854
    Small Footprint, Wide VIN Range Synchronous Step-Down DC/DC Controller
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    Documentation

    Data Sheet 1

    Reliability Data 1

    User Guide 3

    Technical Articles 2

    Data Sheet

    This is the most up-to-date revision of the Data Sheet.

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    Hardware Ecosystem

    Parts Product Life Cycle Description
    Circuit Monitors 1
    LTC2960
    		RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
    Power System Management (PSM) & Sequencers 1
    LTC2974
    		RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
    Protection Switches & Controllers 1
    LT4363
    		RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
    Switching Regulators & Controllers 1
    LTC3880
    		RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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    Tools & Simulations

    LTspice 2

    Models for the following parts are available in LTspice:

    • LTC3854

    LTpowerCAD 5

    Design tools for the following parts are available in LTpowerCAD:

    • LTC3854
    LTspice

    LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

    LTpowerCAD

    LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

    Evaluation Kits

    eval board
    schematic 1
    DC1450A

    LTC3854EDDB Demo Board | 4.5V ≤ VIN ≤ 26V, VOUT = 2.5V @ 5A

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    Product Details

    Demonstration circuit 1450A is a small foot print, high efficiency synchronous buck converter with 4.5V to 26V input range. It can supply 5A maximum load current at 2.5V output. The demo board features the LTC3854EDDB controller. The controller features a 400kHz constant frequency current mode architecture and allows RSENSE or DCR inductor current sensing. The demo board is configured using RSENSE.

    eval board
    schematic 2
    DC1487A

    LTC3854EMSE Demo Board | 4.5V ≤ VIN ≤ 34V, VOUT = 2.5V @ 12A

    Buy Now View Details

    Product Details

    Demonstration circuit 1487A is a small foot print, wide input voltage range, high efficiency synchronous buck converter with 4.5V to 34V input range. It can supply 12A maximum load current at 2.5V output. The demo board features the LTC3854EMSE controller. The controller features a 400kHz constant frequency current mode architecture and allows RSENSE or DCR inductor current sensing. The demo board is configured using RSENSE.

    eval board
    schematic 3
    DC1271A

    LTC3854EDDB Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT = 1.5V @ 15A

    Buy Now View Details

    Product Details

    Demonstration circuit 1271 is a small foot print, high efficiency synchronous buck converter with 4.5V to 14V input range. It can supply 15A maximum load current at 1.5V output. The demo board features the LTC3854EDDB controller. The controller features a 400kHz constant frequency current mode architecture and allows RSENSE or DCR inductor current sensing. The demo board is configured using RSENSE.


     
    DC1450A
    LTC3854EDDB Demo Board | 4.5V ≤ VIN ≤ 26V, VOUT = 2.5V @ 5A
    DC1487A
    LTC3854EMSE Demo Board | 4.5V ≤ VIN ≤ 34V, VOUT = 2.5V @ 12A
    DC1271A
    LTC3854EDDB Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT = 1.5V @ 15A

    Latest Discussions

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