LTC3111

RECOMMENDED FOR NEW DESIGNS

15V, 1.5A Synchronous Buck-Boost DC/DC Converter

Part Models: 16
1ku List Price: Starting From $4.19

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Overview

Regulated Output with V_IN Above, Below or Equal to V_OUT
2.5V to 15V Input and Output Voltage Range
1.5A Continuous Output Current: V_IN ≥ 5V, V_OUT = 5V, PWM Mode
Single Inductor
Accurate RUN Threshold
Up to 95% Efficiency
800kHz Switching Frequency, Synchronizable Between 600kHz and 1.5MHz
49μA No-Load Quiescent Current in Burst Mode^® Operation
Output Disconnect in Shutdown
Shutdown Current < 1μA
Internal Soft-Start
Small, Thermally Enhanced 14-Lead (3mm × 4mm × 0.75mm) DFN and 16-Lead MSOP Packages

The LTC3111 is a fixed frequency, synchronous buckboost DC/DC converter with an extended input and output range. The unique 4-switch, single inductor architecture provides low noise and seamless operation from input voltages above, below or equal to the output voltage.

With an input and output range of 2.5V to 15V, the LTC3111 is well suited for a wide variety of single or multiple-cell batteries, back-up capacitor or wall adapter source applications. Low R_DS(ON) internal N-channel MOSFET switches and selectable PWM or Burst Mode operation produce high efficiency over a wide range of operating conditions. An accurate RUN pin allows the user to program the turn-on threshold voltage of the converter. Other features include: short-circuit protection, internal soft-start and thermal shutdown.

The LTC3111 is offered in both thermally enhanced 14-lead (3mm × 4mm × 0.75mm) DFN and 16-lead MSOP packages.

Applications

3.3V or 5V from 1, 2 or 3 Li-Ion, Multiple-Cell Alkaline/NiMH Batteries
RF Transmitters
Military, Industrial Power Systems

Part Models: 16
1ku List Price: Starting From $4.19

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
LTC3111EDE#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111EDE#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111EMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111EMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111HDE#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111HDE#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111HMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111HMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111IDE#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111IDE#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111IMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111IMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111MPDE#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111MPDE#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111MPMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3111MPMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC3111EDE#PBF	PRODUCTION
LTC3111EDE#TRPBF	PRODUCTION
LTC3111EMSE#PBF	PRODUCTION
LTC3111EMSE#TRPBF	PRODUCTION
LTC3111IDE#PBF	PRODUCTION
LTC3111IDE#TRPBF	PRODUCTION
Jun 5, 2024 - 24_0004 Epoxy Change from Henkel 8290 to 8290A for MSOP (3)
		PCN24_0004_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3111EMSE#PBF	PRODUCTION
LTC3111EMSE#TRPBF	PRODUCTION
LTC3111HMSE#PBF	PRODUCTION
LTC3111HMSE#TRPBF	PRODUCTION
LTC3111IMSE#PBF	PRODUCTION
LTC3111IMSE#TRPBF	PRODUCTION
LTC3111MPMSE#PBF	PRODUCTION
LTC3111MPMSE#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
LTC3111EMSE#PBF	PRODUCTION
LTC3111EMSE#TRPBF	PRODUCTION
LTC3111HMSE#PBF	PRODUCTION
LTC3111HMSE#TRPBF	PRODUCTION
LTC3111IMSE#PBF	PRODUCTION
LTC3111IMSE#TRPBF	PRODUCTION
LTC3111MPMSE#PBF	PRODUCTION
LTC3111MPMSE#TRPBF	PRODUCTION
Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC3111HDE#PBF	PRODUCTION
LTC3111HDE#TRPBF	PRODUCTION
LTC3111HMSE#PBF	PRODUCTION
LTC3111HMSE#TRPBF	PRODUCTION
LTC3111IMSE#PBF	PRODUCTION
LTC3111IMSE#TRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Protection Switches & Controllers 1
LTC4417	RECOMMENDED FOR NEW DESIGNS	Prioritized PowerPath^™ Controller

Tools & Simulations

LTspice 1

LTC3111 Demo Circuit - 5V, 800kHz Wide Input Voltage Buck-Boost Regulator (2.5-15V to 5V @ 1.5A)

Models for the following parts are available in LTspice:

LTC3111

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.

Evaluation Kits

LTC3111 Demo Board | Buck-Boost Converter, 2.5V ≤ VIN ≤ 15V, VOUT = 5V @ 1.5A

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Product Details

Demonstration circuit 1999A is a fixed frequency synchronous buck-boost converter with an extended input and output range. The unique 4-switch, single inductor architecture provides low noise and seamless operation from input voltages above, below, or equal to the output voltage.

Resources

DC1999A - Schematic
2/27/2014

DC1999A - Demo Manual
2/27/2014

DC1999A - Design Files
2/27/2014

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