LTC3374

PRODUCTION

8-Channel Parallelable 1A Buck DC/DCs

Part Models: 12
1ku List Price: Starting From $5.54

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Overview

8-Channel Independent Step-Down DC/DCs
Master-Slave Configurable for Up to 4A per Output Rail with a Single Inductor
Independent V_IN Supplies for Each DC/DC (2.25V to 5.5V)
All DC/DCs Have 0.8V to V_IN Output Range
Precision Enable Pin Thresholds for Autonomous Sequencing

1MHz to 3MHz Programmable/Synchronizable Oscillator Frequency (2MHz Default)
Die Temperature Monitor Output
Thermally Enhanced 38-Lead QFN (5mm × 7mm) and TSSOP Packages

The LTC3374 is a high efficiency multioutput power supply IC. The DC/DCs consist of eight synchronous buck converters (1A each) all powered from independent 2.25V to 5.5V input supplies.

The DC/DCs may be used independently or in parallel to achieve higher currents of up to 4A per output with a shared inductor. The common buck switching frequency may be programmed with an external resistor, synchronized to an external oscillator, or set to a default internal 2MHz clock. The operating mode for all DC/DCs may be programmed via the MODE pin.

To reduce input noise the buck converters are phased in 90° steps. Precision enable pin thresholds provide reliable power-up sequencing. The LTC3374 is available in a compact 38-lead 5mm × 7mm QFN package as well as a 38-lead TSSOP package.


	NOTES
LTC3374
LTC3374A	Higher efficiency, improved output voltage accuracy and an added overvoltage (OV) indicator

Applications

General Purpose Multichannel Power Supplies
Industrial/Automotive/Communications

Part Models: 12
1ku List Price: Starting From $5.54

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
LTC3374EFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3374EFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3374EUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3374EUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3374HFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3374HFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3374HUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3374HUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3374IFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3374IFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3374IUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3374IUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	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
LTC3374EFE#PBF	PRODUCTION
LTC3374EFE#TRPBF	PRODUCTION
LTC3374EUHF#PBF	PRODUCTION
LTC3374EUHF#TRPBF	PRODUCTION
LTC3374HUHF#PBF	PRODUCTION
LTC3374HUHF#TRPBF	PRODUCTION
LTC3374IFE#PBF	PRODUCTION
LTC3374IFE#TRPBF	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
LTC3374EFE#PBF	PRODUCTION
LTC3374EFE#TRPBF	PRODUCTION
LTC3374HFE#PBF	PRODUCTION
LTC3374HFE#TRPBF	PRODUCTION
LTC3374IFE#PBF	PRODUCTION
LTC3374IFE#TRPBF	PRODUCTION
Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC3374IUHF#PBF	PRODUCTION
LTC3374IUHF#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
Power System Management (PSM) & Sequencers 1
LTC2977	RECOMMENDED FOR NEW DESIGNS	8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement
Protection Switches & Controllers 1
LTC4370	RECOMMENDED FOR NEW DESIGNS	Two-Supply Diode-OR Current Balancing Controller

Parts	Product Life Cycle	Description
LTC3374A	RECOMMENDED FOR NEW DESIGNS	High Accuracy 8-Channel Parallelable 1A Buck DC/DCs
LTC3375	RECOMMENDED FOR NEW DESIGNS	8-Channel Programmable, Parallelable 1A Buck DC/DCs

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3374
LTC3374A

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

LTC3374EUHF Demo Board 8-Channel Parallelable 1A Buck DC/DC

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Product Details

Demonstration circuit 1953A is an 8-output power supply featuring the LTC3374. The LTC3374 has eight synchronous buck regulators each with an independent V_IN supply. Up to four buck regulators may be paralleled together to create a higher power buck regulator with a single inductor. The input range of the LTC3374 is ideal for single cell Li-Ion/Polymer battery applications. The buck regulators can be enabled via external precision threshold enable pins to allow hardwired power up sequences.

Resources

DC1953A - Schematic
5/30/2013

DC1953A - Demo Manual
3/13/2015

DC1953A - Design Files
5/30/2013

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