LTC3115-2

RECOMMENDED FOR NEW DESIGNS

40V, 2A Synchronous Buck-Boost DC/DC Converter

Data Sheet (Rev. C) Product Selection Table

Part Models: 20
1ku List Price: Starting From $6.37

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Part Details

Wide V_IN Range: 2.7V to 40V
Wide V_OUT Range: 2.7V to 40V
0.8A Output Current for V_IN ≥ 3.6V, V_OUT = 5V
2A Output Current in Step-Down Operation for V_IN ≥ 6V
Programmable Frequency: 100kHz to 2MHz
Synchronizable Up to 2MHz with an External Clock
Up to 95% Efficiency
30µA No-Load Quiescent Current in Burst Mode^® Operation

Ultralow Noise Buck-Boost PWM
Internal Soft-Start
3µA Supply Current in Shutdown
Programmable Input Undervoltage Lockout
Small 4mm × 5mm × 0.75mm DFN Package
Thermally Enhanced 20-Lead TSSOP Package
AEC-Q100 Qualified for Automotive Applications

The LTC3115-2 is a high voltage monolithic synchronous buck-boost DC/DC converter optimized for applications subject to fast (<1ms) input voltage transients. For all other applications, the LTC3115-1 is recommended. With its wide 2.7V to 40V input and output voltage ranges, the LTC3115-2 is well suited for use in a wide variety of automotive and industrial power supplies. A proprietary low noise switching algorithm optimizes efficiency with input voltages that are above, below or even equal to the output voltage and ensures seamless transitions between operational modes.

Programmable frequency PWM mode operation provides low noise, high efficiency operation and the ability to synchronize switching to an external clock. Switching frequencies up to 2MHz are supported to allow use of small value inductors for miniaturization of the application circuit. Pin selectable Burst Mode operation reduces standby current and improves light load efficiency which, combined with a 3µA shutdown current, make the LTC3115-2 ideally suited for battery-powered applications. Additional features include output disconnect in shutdown, short-circuit protection and internal soft-start. The LTC3115-2 is available in thermally enhanced 16-lead 4mm × 5mm × 0.75mm DFN and 20-lead TSSOP packages.


	Features
LTC3115-1	-
LTC3115-2	Optimized for applications subject to fast (<1ms) input voltage transients

APPLICATIONS

24V/28V Industrial Applications
Automotive Power Systems
Telecom, Servers and Networking Equipment
FireWire Regulator
Multiple Power Source Supplies

Part Models: 20
1ku List Price: Starting From $6.37

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
LTC3115EDHD-2#PBF	16-Lead DFN (5mm x 4mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115EDHD-2#TRPBF	16-Lead DFN (5mm x 4mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115EDHD-2#WPBF	16-Lead DFN (5mm x 4mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115EDHD-2#WTRPBF	16-Lead DFN (5mm x 4mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115EFE-2#PBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115EFE-2#TRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115EFE-2#WPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115EFE-2#WTRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115HFE-2#PBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115HFE-2#TRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115IDHD-2#PBF	16-Lead DFN (5mm x 4mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115IDHD-2#TRPBF	16-Lead DFN (5mm x 4mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115IDHD-2#WPBF	16-Lead DFN (5mm x 4mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115IDHD-2#WTRPBF	16-Lead DFN (5mm x 4mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115IFE-2#PBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115IFE-2#TRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115IFE-2#WPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115IFE-2#WTRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115MPFE-2#PBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3115MPFE-2#TRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC3115EDHD-2#PBF	PRODUCTION
LTC3115EDHD-2#TRPBF	PRODUCTION
LTC3115EDHD-2#WPBF
LTC3115EDHD-2#WTRPBF
LTC3115EFE-2#PBF	PRODUCTION
LTC3115EFE-2#TRPBF	PRODUCTION
LTC3115EFE-2#WPBF
LTC3115EFE-2#WTRPBF
LTC3115HFE-2#PBF	PRODUCTION
LTC3115HFE-2#TRPBF	PRODUCTION
LTC3115IDHD-2#WPBF
LTC3115IDHD-2#WTRPBF	PRODUCTION
LTC3115IFE-2#PBF	PRODUCTION
LTC3115IFE-2#TRPBF	PRODUCTION
LTC3115IFE-2#WPBF
LTC3115IFE-2#WTRPBF
Jul 31, 2020 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)
		PCN20_0245_Form Material_Report Delta Qualification Matrix Other Qualification Results Summary
LTC3115EDHD-2#PBF	PRODUCTION
LTC3115EDHD-2#TRPBF	PRODUCTION
LTC3115EFE-2#PBF	PRODUCTION
LTC3115EFE-2#TRPBF	PRODUCTION
LTC3115HFE-2#PBF	PRODUCTION
LTC3115HFE-2#TRPBF	PRODUCTION
LTC3115IDHD-2#PBF	PRODUCTION
LTC3115IDHD-2#TRPBF	PRODUCTION
LTC3115IDHD-2#WPBF
LTC3115IDHD-2#WTRPBF	PRODUCTION
LTC3115IFE-2#PBF	PRODUCTION
LTC3115IFE-2#TRPBF	PRODUCTION
LTC3115MPFE-2#PBF	PRODUCTION
LTC3115MPFE-2#TRPBF	PRODUCTION
Apr 12, 2022 - 22_0081 Moisture Sensitivity Level Rating Change of LTC3114-1, LTC3115-1, LTC3115-2 with #W for LFCSP Package.
		PCN22_0081_Form Material_Report Delta Qualification Matrix
LTC3115EDHD-2#WPBF
LTC3115EDHD-2#WTRPBF
LTC3115IDHD-2#WPBF
LTC3115IDHD-2#WTRPBF	PRODUCTION
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LTC3115EFE-2#PBF	PRODUCTION
LTC3115EFE-2#TRPBF	PRODUCTION
LTC3115HFE-2#PBF	PRODUCTION
LTC3115HFE-2#TRPBF	PRODUCTION
LTC3115IFE-2#PBF	PRODUCTION
LTC3115IFE-2#TRPBF	PRODUCTION
LTC3115MPFE-2#PBF	PRODUCTION
LTC3115MPFE-2#TRPBF	PRODUCTION

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
High Voltage Hot Swap Controllers 1
LTC4364	RECOMMENDED FOR NEW DESIGNS	Surge Stopper with Ideal Diode
PowerPath, Ideal Diodes, and Load Switches 1
LTC4359	RECOMMENDED FOR NEW DESIGNS	Ideal Diode Controller with Reverse Input Protection

Tools & Simulations

LTspice 1

LTC3115-2 - Buck-Boost Regulators

Models for the following parts are available in LTspice:

LTC3115-1
LTC3115-2

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.

Evaluation Kits

LTC3115EDHD-2 Demo Board | 2.7V to 40VIN, 5VOUT @ 2A

Buy Now View Details

Product Details

Demonstration circuit 2119A features the LTC3115-2, a high voltage monolithic synchronous buck-boost converter optimized for applications with fast input voltage transients. The DC2119A demo board has two user selectable operating modes: Burst Mode^© and Forced Continuous Operation (Fixed Frequency PWM) (JP1). There is also an accurate programmable RUN pin which is used to ENABLE the converter (JP2). The DC2119A operates with a 2.7V to 40V input voltage range. The demo board has been designed with the output voltage set to 5.0V. The LTC3115-2 incorporates a proprietary low noise switching algorithm which optimizes efficiency with input voltages above, below or equal to the output voltage and ensures seamless transitions between operating modes.

Resources

DC2119A - Schematic
76.00K

DC2119A - Demo Manual
433.00K

DC2119A - Design Files
788.00K

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LTC3115-2

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Solutions Bulletin & Brochure 1

3rd Party Solutions 1