LTC2928 - Multichannel Power Supply Sequencer and Supervisor

Features

  • Easily Configure Power Management without Software
  • Controls Up to Four Supplies per Device
  • Cascades for Additional Supplies
  • Staged Supply Sequencing with Adjustable Time Positions
  • Fault Event Reporting with Diagnostics
  • Selectable System Shutdown on Fault
  • 1.5% Undervoltage Monitor Accuracy
  • Overvoltage and/or Fault Indication
  • Configurable Undervoltage and Overvoltage Thresholds
  • Charge Pumped Enable Pins Drive N-Channel MOSFETs
  • Operates from 2.9V to 16.5V
  • 5mm × 7mm 38-lead QFN and 36-lead SSOP Packages

Typical Application

LTC2928 Typical Application
LTC2928 Typical Application

Description

The LTC2928 is a four channel cascadable power supply sequencer and high accuracy supervisor. Sequencing thresholds, order and timing are configured with just a few external components, negating the need for PC board layout or software changes during system development. Multiple LTC2928s may be easily connected to sequence an unlimited number of power supplies.

Sequence outputs control supply enable pins or N-channel pass gates. Precision input comparators with individual outputs monitor power supply voltages to 1.5% accuracy. Supervisory functions include undervoltage and overvoltage monitoring and reporting as well as μP reset generation. RST may be forced high to complement margin testing.

Application faults, whether internally or externally generated, can shutdown all controlled supplies. The type and source of faults are reported for diagnosis. Individual channel controls are available to independently exercise enable outputs and supervisory functions.

A high voltage input allows the LTC2928 to be powered from voltages as high as 16.5V. A buffered reference output permits single negative power supply sequencing and monitoring operations.

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
LTC2928CG#PBF SSOP-24 G C 05-08-1640 (G24) Yes
LTC2928CG#TRPBF SSOP-24 G C 05-08-1640 (G24) Yes
LTC2928CUHF#PBF 5x7 QFN-38 UHF C 05-08-1701 Yes
LTC2928CUHF#TRPBF 5x7 QFN-38 UHF C 05-08-1701 Yes
LTC2928IG#PBF SSOP-24 G I 05-08-1640 (G24) Yes
LTC2928IG#TRPBF SSOP-24 G I 05-08-1640 (G24) Yes
LTC2928IUHF#PBF 5x7 QFN-38 UHF I 05-08-1701 Yes
LTC2928IUHF#TRPBF 5x7 QFN-38 UHF I 05-08-1701 Yes


LTC2928 Package Drawing
LTC2928 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
LTC2928CG#PBF SSOP-24 C $5.79 $3.95 Yes
LTC2928CG#TRPBF SSOP-24 C $4.01 Yes
LTC2928CUHF#PBF 5x7 QFN-38 C $5.79 $3.95 Yes
LTC2928CUHF#TRPBF 5x7 QFN-38 C $4.01 Yes
LTC2928IG#PBF SSOP-24 I $6.94 $4.74 Yes
LTC2928IG#TRPBF SSOP-24 I $4.80 Yes
LTC2928IUHF#PBF 5x7 QFN-38 I $6.94 $4.74 Yes
LTC2928IUHF#TRPBF 5x7 QFN-38 I $4.80 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
DC1029B LTC2928, 4-ch sequencer and supervisor w/ fault rep $50.00
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Click here to view our complete list of demo boards

Applications

  • Network/Telecom Infrastructure
  • Sequencing for Multiple I/O and Core Voltages
  • Power Management

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

Technical Support