Features and Benefits
- 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
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.
- AdvancedTCA Systems
- Telecom Infrastructure
- –48V Distributed Power Systems
- Power Monitors
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)
DC998A - Demo Board for the LTC4261 Negative Voltage Hot Swap Controllers with ADC and I2C Monitoring.
Documentation & Resources
R413 Reliability Data3/26/201826 K
DC998A - Demo Manual9/24/2009585K
DN397 - AdvancedTCA Hot Swap Controller Monitors Power Distribution3/26/2008114K
Hot Swap Controllers7/13/2017778 K
Power and Thermal Monitoring1/9/20171M
Understanding Power Monitor Accuracy2/20/2015
Negative Voltage Hot Swap Controller with 10-Bit ADC and I2C Monitoring3/1/2006 LT Journal
Tools & Simulations
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Models for the following parts are available in LTspice:
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.
Reference Designs (1)
Terasic DE10-Nano Kit
Terasic DE10-Nano Kit
Features & Benefits
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.