LTC3854
PRODUCTIONSmall Footprint, Wide VIN Range Synchronous Step-Down DC/DC Controller
- Part Models
- 8
- 1ku List Price
- Starting From $2.53
Overview
- 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
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
Documentation
Data Sheet 1
User Guide 3
Technical Articles 3
Video 1
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 Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3854EDDB#TRMPBF | 12-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3854EDDB#TRPBF | 12-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3854EMSE#PBF | 12-Lead MSOP w/ EP | ||
| LTC3854EMSE#TRPBF | 12-Lead MSOP w/ EP | ||
| LTC3854IDDB#TRMPBF | 12-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3854IDDB#TRPBF | 12-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3854IMSE#PBF | 12-Lead MSOP w/ EP | ||
| LTC3854IMSE#TRPBF | 12-Lead MSOP w/ EP |
| Part Models | 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 |
||
| LTC3854IMSE#PBF | PRODUCTION | |
| LTC3854IMSE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC3854
LTpowerCAD 5
- LTC3854 Project - Synchronous Step-Down Switching Supply with Inductor DCR Current Sensing (4.5-14V to 1.5V @ 15A)
- LTC3854 Project - Synchronous Step-Down Switching Supply with Inductor DCR Current Sensing (4.5-25V to 2.5V @ 5A)
- LTC3854 Project - Synchronous Step-Down Switching Supply with Inductor DCR Current Sensing (4.5-34V to 2.5V @ 12A)
- LTC3854 Project - Synchronous Step-Down Switching Supply with Rsense Current Sensing (4.5-14V to 1.5V @ 15A)
- LTC3854 Project - Synchronous Step-Down Switching Supply with Rsense Current Sensing (4.5-34V to 2.5V @ 12A)
Design tools for the following parts are available in LTpowerCAD:
- LTC3854
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® 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
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