LTC2928

RECOMMENDED FOR NEW DESIGNS

Multichannel Power Supply Sequencer and Supervisor

Data Sheet (Rev. C) Product Selection Table

Part Models: 8
1ku List Price: Starting From $4.72

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Overview

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

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.

APPLICATIONS

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

Part Models: 8
1ku List Price: Starting From $4.72

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
LTC2928CG#PBF	24-Lead SSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2928CG#TRPBF	24-Lead SSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2928CUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2928CUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2928IG#PBF	24-Lead SSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2928IG#TRPBF	24-Lead SSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2928IUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2928IUHF#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
LTC2928CG#PBF	PRODUCTION
LTC2928CG#TRPBF	PRODUCTION
LTC2928CUHF#PBF	PRODUCTION
LTC2928CUHF#TRPBF	PRODUCTION
Nov 18, 2019 - 19_0266 Laser Top Mark for SSOP36/44/48 Packages assembled in ADPG and UTAC
		PCN19_0266_Form Material_Report Detailed Parts List
LTC2928CG#PBF	PRODUCTION
LTC2928CG#TRPBF	PRODUCTION
LTC2928IG#PBF	PRODUCTION
LTC2928IG#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
Analog to Digital Converters (ADCs) 1
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor
Power System Management (PSM) & Sequencers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC2928

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

LTC2928, 4-channel Sequencer and Supervisor w/ Fault Rep

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Product Details

Demonstration circuit 1029B is for evaluating the performance of the LTC2928 Multichannel Power Supply Sequencer and Supervisor.

The LTC2928 sequences and monitors up to four power channels in power-up and power-down, and it monitors those outputs in the steady state. Sequencing is accomplished by controlling the power supply enable inputs or N-channel MOSFET gates with the LTC2928 outputs. Supervisory functions include undervoltage and overvoltage monitoring, and capturing the output state information in the event of a system fault.