LTC3851-1

PRODUCTION

Synchronous Step-Down Switching Regulator Controller

Part Models: 6
1ku List Price: Starting From $2.09

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Part Details

Wide V_IN Range: 4V to 38V Operation
R_SENSE or DCR Current Sensing
±1% Output Voltage Accuracy
Power Good Output Voltage Monitor
Phase-Lockable Fixed Frequency: 250kHz to 750kHz
Dual N-Channel MOSFET Synchronous Drive
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Output Voltage Soft-Start or Tracking
Output Current Foldback Limiting
Output Overvoltage Protection
OPTI-LOOP^® Compensation Minimizes C_OUT
Selectable Continuous, Pulse-Skipping or Burst Mode^® Operation at Light Loads
Low Shutdown I_Q: 20μA
V_OUT Range: 0.8V to 5.5V
Thermally Enhanced 16-Lead MSOP or 3mm × 3mm QFN Package

The LTC3851-1 is a high performance synchronous step-down switching regulator controller that drives an all N-channel synchronous power MOSFET stage. A constant frequency current mode architecture allows a phase-lockable frequency of up to 750kHz.

OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3851-1 features a precision 0.8V reference and a power good indicator. A wide 4V to 38V (40V absolute maximum) input supply range encompasses most battery configurations and intermediate bus voltages.

The TK/SS pin ramps the output voltage during start-up and shutdown with coincident or ratiometric tracking. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode operation, pulse skipping mode or continuous inductor current mode at light loads and allows the IC to be synchronized to an external clock.

The LTC3851-1 is identical to the LTC3851 except that the I_LIM pin is replaced by PGOOD.


	Features
LTC3851	Not Recommended For New Designs
LTC3851-1	Not Recommended For New Designs
LTC3851A	Adjustable Current Limit
LTC3851A-1	PGOOD Output

Applications

Automotive Systems
Telecom Systems
Industrial Equipment
Distributed DC Power Systems

Part Models: 6
1ku List Price: Starting From $2.09

Documentation

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
LTC3851EMSE-1#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3851EMSE-1#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3851EUD-1#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3851EUD-1#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3851IMSE-1#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3851IMSE-1#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LTC3851EMSE-1#PBF	PRODUCTION
LTC3851EMSE-1#TRPBF	PRODUCTION
LTC3851EUD-1#PBF	PRODUCTION
LTC3851EUD-1#TRPBF	PRODUCTION
LTC3851IMSE-1#PBF	PRODUCTION
LTC3851IMSE-1#TRPBF	PRODUCTION
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package
		PCN22_0244_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3851EMSE-1#PBF	PRODUCTION
LTC3851EMSE-1#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0132_Form Material_Report
LTC3851EMSE-1#PBF	PRODUCTION
LTC3851EMSE-1#TRPBF	PRODUCTION
LTC3851IMSE-1#PBF	PRODUCTION
LTC3851IMSE-1#TRPBF	PRODUCTION
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3851IMSE-1#PBF	PRODUCTION
LTC3851IMSE-1#TRPBF	PRODUCTION

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Silicon Oscillators 1
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Parts	Product Life Cycle	Description
LTC3851A-1	PRODUCTION	Synchronous Step-Down Switching Regulator Controller

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3851
LTC3851-1
LTC3851A
LTC3851A-1

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.

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Part Details

Documentation

Data Sheet 1

Reliability Data 1

Application Note 1

Hardware Ecosystem

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

Latest Discussions

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