LTC3374A - High Accuracy 8-Channel Parallelable 1A Buck DC/DCs

Features

  • 8-Channel 1A Independent Step-Down DC/DCs
  • Master-Slave Configurable for Up to 4A of Output Current with a Single Inductor
  • Independent VIN Supplies for Each DC/DC (2.25V to 5.5V)
  • All DC/DCs Have 0.8V to VIN Output Range
  • ±1% VFB Accuracy, for Buck 1 (1A to 4A)
  • ±1% PGOOD Accuracy
  • Precision Enable Pin Thresholds for Autonomous Sequencing
  • 1MHz to 3MHz Programmable/Synchronizable Oscillator Frequency (2MHz Default)
  • Die Temperature Monitor Output
  • Thermally Enhanced 38-Lead 5mm × 7mm QFN and TSSOP Packages
  • Pin-Compatible with LTC3374

Typical Application

LTC3374A Typical Application
LTC3374A Typical Application

Description

The LTC3374A is a multioutput power supply IC consisting of eight synchronous 1A buck converters, all powered from independent 2.25V to 5.5V input supplies. An upgraded pin-compatible version of the LTC3374, the LTC3374A, has higher efficiency, improved output voltage accuracy and an added overvoltage (OV) indicator.

The DC/DCs may be used independently or in parallel to achieve higher output currents of up to 4A 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 simplify powerup sequencing. The LTC3374A is available in a 38-lead 5mm × 7mm QFN package as well as a 38-lead exposed pad TSSOP package.

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

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC3374AEFE#PBF TSSOP-38 FE E 05-08-1772 Yes
LTC3374AEFE#TRPBF TSSOP-38 FE E 05-08-1772 Yes
LTC3374AEUHF#PBF 5x7 QFN-38 UHF E 05-08-1701 Yes
LTC3374AEUHF#TRPBF 5x7 QFN-38 UHF E 05-08-1701 Yes
LTC3374AHFE#PBF TSSOP-38 FE H 05-08-1772 Yes
LTC3374AHFE#TRPBF TSSOP-38 FE H 05-08-1772 Yes
LTC3374AHUHF#PBF 5x7 QFN-38 UHF H 05-08-1701 Yes
LTC3374AHUHF#TRPBF 5x7 QFN-38 UHF H 05-08-1701 Yes
LTC3374AIFE#PBF TSSOP-38 FE I 05-08-1772 Yes
LTC3374AIFE#TRPBF TSSOP-38 FE I 05-08-1772 Yes
LTC3374AIUHF#PBF 5x7 QFN-38 UHF I 05-08-1701 Yes
LTC3374AIUHF#TRPBF 5x7 QFN-38 UHF I 05-08-1701 Yes


LTC3374A Package Drawing
LTC3374A Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3374AEFE#PBF TSSOP-38 E $6.79 $4.75 Yes
LTC3374AEFE#TRPBF TSSOP-38 E $6.85 $4.81 Yes
LTC3374AEUHF#PBF 5x7 QFN-38 E $6.64 $4.65 Yes
LTC3374AEUHF#TRPBF 5x7 QFN-38 E $6.70 $4.71 Yes
LTC3374AHFE#PBF TSSOP-38 H $7.93 $5.55 Yes
LTC3374AHFE#TRPBF TSSOP-38 H $7.99 $5.61 Yes
LTC3374AHUHF#PBF 5x7 QFN-38 H $8.00 $5.60 Yes
LTC3374AHUHF#TRPBF 5x7 QFN-38 H $8.06 $5.66 Yes
LTC3374AIFE#PBF TSSOP-38 I $7.43 $5.20 Yes
LTC3374AIFE#TRPBF TSSOP-38 I $7.49 $5.26 Yes
LTC3374AIUHF#PBF 5x7 QFN-38 I $7.64 $5.35 Yes
LTC3374AIUHF#TRPBF 5x7 QFN-38 I $7.70 $5.41 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2440A LTC3374AEUHF Demo Board | High Accuracy 8-Ch Parallelable 1A Sync Bucks; 2.25V ≤ VIN ≤ 5.5V, Vout1-Vout8 = 1V to 3.3V @ 1A Contact Factory
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Click here to view our complete list of demo boards

Applications

  • General Purpose Multichannel Power Supplies
  • Industrial/Automotive/Communications

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC3374

Technical Support