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
High Efficiency Synchronous Step-Down Converter Efficiency and Power Loss vs Load Current Product Package 1 Product Package 2
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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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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Digital Power System Managers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice 1

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
DC1271A

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

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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.


 


eval board
schematic 2
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 3
DC1487A

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

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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.

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

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