LTC3126

RECOMMENDED FOR NEW DESIGNS

42V, 2.5A Synchronous Step-Down Regulator with No-Loss Input PowerPath

Data Sheet Product Selection Table

Part Models: 12
1ku List Price: Starting From $4.65

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Part Details

Seamless, Automatic Transition Between Two Input Power Sources
Wide Input Voltage Range: 2.4V to 42V
Wide Output Voltage Range: 0.818V to V_IN
Up to 2.5A Continuous Output Current
Pin Selectable Priority and Ideal Diode-OR Modes
Burst Mode^® Operation, I_Q = 2μA
95% Efficiency at 1A, V_IN = 12V, V_OUT = 5V
1μA Current in Shutdown
Programmable Input UVLO Thresholds
Input Valid, Priority Channel and PGOOD Indicators
200kHz to 2.2MHz Fixed Frequency PWM
Synchronizable to an External Clock
Current Mode Control with 60ns Minimum On-Time
Minimal External Components
Thermally Enhanced 28-Lead 4mm × 5mm QFN and 28-Lead TSSOP Packages

Part Models: 12
1ku List Price: Starting From $4.65

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
LTC3126EFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3126EFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3126EUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3126EUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3126HFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3126HFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3126IFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3126IFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3126IUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3126IUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3126MPFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3126MPFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

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
LTC3126EFE#PBF	PRODUCTION
LTC3126EFE#TRPBF	PRODUCTION
LTC3126HFE#PBF	PRODUCTION
LTC3126HFE#TRPBF	PRODUCTION
LTC3126IFE#PBF	PRODUCTION
LTC3126IFE#TRPBF	PRODUCTION
LTC3126MPFE#PBF	PRODUCTION
LTC3126MPFE#TRPBF	PRODUCTION
Apr 11, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process
		PCN19_0067_Form Material_Report Delta Qualification Matrix Qualification Results Summary Detailed Parts List Other
LTC3126EFE#PBF	PRODUCTION
LTC3126EFE#TRPBF	PRODUCTION
LTC3126EUFD#PBF	PRODUCTION
LTC3126EUFD#TRPBF	PRODUCTION
LTC3126HFE#PBF	PRODUCTION
LTC3126HFE#TRPBF	PRODUCTION
LTC3126IFE#PBF	PRODUCTION
LTC3126IFE#TRPBF	PRODUCTION
LTC3126IUFD#PBF	PRODUCTION
LTC3126IUFD#TRPBF	PRODUCTION
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC3126EUFD#PBF	PRODUCTION
LTC3126EUFD#TRPBF	PRODUCTION
LTC3126IUFD#PBF	PRODUCTION
LTC3126IUFD#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
PowerPath, Ideal Diodes, and Load Switches 2
LTC4417	RECOMMENDED FOR NEW DESIGNS	Prioritized PowerPath^™ Controller
LTC4419	RECOMMENDED FOR NEW DESIGNS	18V Dual Input Micropower PowerPath Prioritizer

Parts	Product Life Cycle	Description
LTC3118	RECOMMENDED FOR NEW DESIGNS	18V, 2A Buck-Boost DC/DC Converter with Low-Loss Dual Input PowerPath

Tools & Simulations

LTspice 1

LTC3126 - Step-Down (Buck) Regulators

Models for the following parts are available in LTspice:

LTC3126

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

LTC3126EUFD Demo Board | Dual Input Sync Buck, 4.3V ≤ VIN1 ≤ 42V, 6V ≤ VIN2 ≤ 8.4V (Operational to 42V), VOUT = 3.3V @ 2.5A

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Product Details

Demonstration Circuit 2215A, features the LTC3126, a synchronous buck converter with an integrated lossless input PowerPath™. Pin selectable (JP2) ideal diode-OR and priority input modes, with programmable undervoltage lockout thresholds provide control over the transition between input sources. The unique all N-channel architecture provides efficient operation from either of two input sources to a programmable output voltage. In this application the valid input voltage range is set to be from 4.3V to 42V on V_IN1 and from 6V to 8.4V on V_IN2 providing flexibility and voltage margin for a variety of applications and power sources. V_IN2 can operate to 42V. Other input voltage ranges are possible by adjusting the V_SET1/2 threshold values (set by resistors R9 thru R12) accordingly.

Resources

DC2215A - Demo Manual
341.00K

DC2215A - Schematic
90.00K

DC2215A - Design Files
2.00M

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