LTC4218CGN 16-Lead SSOP Hot Swap Controller with Current Monitor
The LTC4218CGN is a hot swap controller that lets a board be inserted into and removed from a live backplane without disturbing the bus. An internal high side driver controls the gate of an external N-channel MOSFET, and the part operates from 2.9 V to 26.5 V, covering 5 V, 12 V and 24 V systems.
The undervoltage, overvoltage and power good thresholds are set with external dividers against an internal 1.235 V reference that is accurate to 2 percent, so the same part can guard a 5 V, 12 V or 24 V rail. UV hysteresis is 80 mV and OV hysteresis is 20 mV, which keeps a noisy rail from chattering the channel.
Current limit is set by a sense resistor and is accurate to 5 percent at a 15 mV threshold. The ISET pin allows the limit to be adjusted dynamically, and current foldback cuts the threshold as the output collapses, which protects the MOSFET during a hard short. The IMON pin amplifies the sense voltage by 6.67 microamps per millivolt for ground referenced current readout.
A capacitor on the TIMER pin sets how long the part may stay in current limit before the circuit breaker trips. After an overcurrent fault the FLT output pulls low and the switch latches off; pulling UV low for at least 1 microsecond, or tying FLT to UV, gives automatic retry. PG reports that the output is in regulation, and inrush is set by the gate resistor and capacitor.
The LTC4218CGN is the commercial grade part in the 16-Lead Plastic SSOP package, specified from 0 to 70 degrees C. It is RoHS compliant and lead free, every order ships with full traceability, and samples and volume pricing are available on request.
Company Profile
Shenzhen Mingjiada Electronics Co., Ltd. is an independent distributor of electronic components from established manufacturers. Founded in Shenzhen in 1996, Mingjiada has established branches in Hong Kong, Japan, Russia, and Taiwan.
Certified under ISO9001:2014 for quality management systems and ISO14001:2014 for environmental management systems. With an experienced team in sales, R&D and management, we specialize in distributing products from more than 500 established suppliers.
Adhering to the principle of "maximizing benefits for customers," we offer comprehensive product ranges and provide high-quality, responsive service through professional logistics and customer service teams.
Frequently Asked Questions
Are your LTC4218CGN products new stock?
Yes. Every part we ship is new stock sourced through established supply channels, with full traceability.
Which package does the LTC4218CGN use?
It is supplied in the 16-Lead Plastic SSOP package, the commercial grade version specified from 0 to 70 degrees C.
What supply voltage range does the LTC4218CGN support?
It operates from 2.9 V to 26.5 V, with an absolute maximum VDD rating of 35 V.
How accurate is the current limit of the LTC4218CGN?
The sense threshold is 15 mV with 5 percent accuracy, and current foldback lowers the threshold as the output voltage collapses to protect the MOSFET.
How is the fault timer set on the LTC4218CGN?
A capacitor on the TIMER pin sets the delay in current limit before the circuit breaker trips, so the time is chosen by the designer rather than fixed internally.
What happens after an overcurrent fault?
The FLT output pulls low and the switch latches off. Pulling UV low for at least 1 microsecond resets it, and tying FLT to UV gives automatic retry.
Do you have the LTC4218-12 version with preset thresholds?
Yes. The LTC4218-12 has internal dividers for 12 V systems and needs no external setting resistors; the adjustable version uses external dividers on UV, OV and FB.
How do you ship my order? Is it safe?
We use express carriers including DHL, FedEx, UPS, TNT, and EMS. We can also use your preferred forwarder. Products are carefully packaged to ensure safety, and we take responsibility for any damage to your order.
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