LTC3854
Info: : PRODUCTION
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LTC3854

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

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Models 8
1ku List Price Starting From $2.00
Features
  • 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
Additional Details
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The LTC3854 is a high performance synchronous stepdown switching DC/DC controller that drives an all N-channel synchronous power MOSFET stage.

The LTC3854 features a 400kHz constant frequency current mode architecture. The LTC3854 operates from a 4.5V to 38V (40V absolute maximum) input voltage range and regulates the output voltage from 0.8V to 5.5V.

The RUN/SS pin provides both soft-start and enable features. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. Current foldback limits MOSFET dissipation during short circuit conditions. Current foldback functions are disabled during soft-start.

The LTC3854 has a minimum on-time at 75ns, making it well suited for high step-down ratios. The strong onboard MOSFET drivers allow the use of high power external MOSFETs to produce output currents up to 20A.

Applications

  • Automotive Systems
  • Telecom Systems
  • Industrial Equipment
  • Distributed DC Power Systems
Part Models 8
1ku List Price Starting From $2.00

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Documentation

Video

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3854EDDB#TRMPBF
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LTC3854EDDB#TRPBF
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LTC3854EMSE#PBF
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LTC3854EMSE#TRPBF
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LTC3854IDDB#TRMPBF
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LTC3854IDDB#TRPBF
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LTC3854IMSE#PBF
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LTC3854IMSE#TRPBF
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Product Lifecycle

PCN

Oct 11, 2022

- 22_0244

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LTC3854EMSE#PBF

PRODUCTION

LTC3854EMSE#TRPBF

PRODUCTION

LTC3854IMSE#PBF

PRODUCTION

LTC3854IMSE#TRPBF

PRODUCTION

Feb 4, 2020

- 20_0129

Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC

LTC3854EMSE#PBF

PRODUCTION

LTC3854EMSE#TRPBF

PRODUCTION

LTC3854IMSE#PBF

PRODUCTION

LTC3854IMSE#TRPBF

PRODUCTION

Apr 18, 2022

- 22_0050

UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0244

arrow down

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LTC3854EMSE#PBF

PRODUCTION

LTC3854EMSE#TRPBF

PRODUCTION

LTC3854IMSE#PBF

PRODUCTION

LTC3854IMSE#TRPBF

PRODUCTION

Feb 4, 2020

- 20_0129

arrow down

Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC

LTC3854EMSE#PBF

PRODUCTION

LTC3854EMSE#TRPBF

PRODUCTION

LTC3854IMSE#PBF

PRODUCTION

LTC3854IMSE#TRPBF

PRODUCTION

Apr 18, 2022

- 22_0050

arrow down

UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

Software & Part Ecosystem

Evaluation Kits 3

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DC1450A

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

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DC1450A

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

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

Product Detail

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.

reference details image

DC1271A

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

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DC1271A

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

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

Product Detail

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.


 


reference details image

DC1487A

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

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DC1487A

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

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

Product Detail

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.

Tools & Simulations 2

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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