LTC4232IDHC Integrated Circuit Chip 5A Integrated Hot Swap Controller 33mOhm MOSFET 16-Lead DFN

The LTC4232IDHC is an integrated Hot Swap solution that allows a board to be inserted into and removed from a live backplane safely. The controller, the power MOSFET and the current sense resistor are combined in one package, so the solution needs very little board area.

The input range is 2.9 V to 15 V. Inrush current is controlled separately from the overcurrent limit through an adjustable GATE ramp of 0.3 V per millisecond typical, and the 5 A current limit is 10 percent accurate with foldback, set by the ISET pin.

A current monitor output amplifies the sense resistor voltage by 20 microamps per amp for ground referenced current sensing, and a MOSFET temperature monitor output reports device heating. Thermal limit, overvoltage, undervoltage and power good monitoring are all included.

Undervoltage and overvoltage thresholds are accurate to 2 percent. The current limit timer is adjustable so short overloads do not trip the breaker, and the PG and FLT outputs report rail status to the system. The LTC4232-1 version offers a faster turn-on with a 16 ms debounce delay and external control of the GATE ramp.

The LTC4232IDHC is the industrial grade part in the 16-Lead (5mm x 3mm) Plastic DFN package, specified from -40 to 85 degrees C. It is pin compatible with the LTC4217 in the DFN package. The part is RoHS compliant and lead free, every order ships with full traceability, and samples and volume pricing are available on request.

• Allows safe board insertion into a live backplane
• Small footprint with controller, MOSFET and sense resistor in one package
• 33 mOhm MOSFET with integrated sense resistor
• Wide 2.9 V to 15 V operating range
• Adjustable, 10 percent accurate current limit
• Current and temperature monitor outputs
• Overtemperature protection
• Adjustable current limit timer before fault
• Power good and fault outputs
• Adjustable inrush current control
• 2 percent accurate undervoltage and overvoltage protection
• Pin compatible with LTC4217 in the DFN package
• 16-Lead (5mm x 3mm) Plastic DFN package
• RoHS compliant, lead free

• RAID systems and solid state drives
• Server I/O cards
• Industrial power-up control
• Hot board and connector insertion
• Backplane plug-in modules
• Disk drive arrays

Typical use is a plug-in card on a 5 V or 12 V backplane that must limit its inrush current and report a clean power good signal.

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