Features and Benefits
- 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.
- Network/Telecom Infrastructure
- Sequencing for Multiple I/O and Core Voltages
- Power Management
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
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.
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.
Sample & Buy
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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.