LTC2928CG#PBF

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 shut down 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

Key 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