LTC4261
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LTC4261

Negative Voltage Hot Swap Controllers with ADC and I²C Monitoring

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Part Details
Part Models 16
1ku List Price Starting From $6.43
Features
  • Allows Safe Insertion into Live –48V Backplanes
  • 10-Bit ADC Monitors Current and Voltages
  • I2C/SMBus Interface or Single-Wire Broadcast Mode
  • Floating Topology Allows Very High Voltage Operation
  • Independently Adjustable Inrush and Overcurrent Limits
  • Controlled Soft-Start Inrush
  • Adjustable UV/OV Thresholds and Hysteresis
  • Sequenced Power Good Outputs with Delays
  • Adjustable Power Good Input Timeout
  • Programmable Latchoff or Auto-Retry After Faults
  • Alerts Host After Faults
  • Available in 28-Lead Narrow SSOP and 24-Lead (4mm × 5mm) QFN Packages
Additional Details
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The LTC4261/LTC4261-2 negative voltage Hot Swap controllers allow a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, the board supply voltage can be ramped at an adjustable rate. The devices feature independently adjustable inrush current and overcurrent limits to minimize stresses on the pass transistor during start-up, input step and output short conditions. The LTC4261 defaults to latch-off while the LTC4261-2 defaults to auto-retry on overcurrent faults.

An I2C interface and onboard 10-bit ADC allow monitoring of board current, voltage and fault status. A single-wire broadcast mode is available to simplify the interface by eliminating two optoisolators.

The controllers have additional features to interrupt the host when a fault has occurred, notify when output power is good, detect insertion of a board and turn off the pass transistor if an external supply monitor fails to indicate power good within a timeout period.

Applications

  • AdvancedTCA Systems
  • Telecom Infrastructure
  • –48V Distributed Power Systems
  • Power Monitors
Part Models 16
1ku List Price Starting From $6.43

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Aug 10, 2022

- 22_0177

Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

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Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

Tools & Simulations

Tools & Simulations 2

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

Linduino

Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.

Linduino code repository on GitHub and instructions on how to use the code.

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Reference Designs

Reference Designs 1

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Circuits from the lab

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Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
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