LT4256-3IGN 16-Lead SSOP Positive High Voltage Hot Swap Controller
The LT4256-3IGN is a high voltage hot swap controller that lets a board be inserted into and removed from a live backplane. An internal driver controls the gate of an external high side N-channel MOSFET for supply voltages from 10.8 V to 80 V, covering 12 V, 24 V and 48 V distributed power.
An adjustable analog foldback current limit holds the inrush into the load capacitance inside the backplane budget, and the foldback characteristic lowers the limit as the output collapses so the pass MOSFET stays inside its safe operating area during a short. The supply power-up rate is programmable, which keeps a large card from browning out its neighbours.
An OPEN output flags abnormally low load current, which detects an unplugged load, a blown fuse or an open MOSFET that a current limit circuit alone cannot see. Combined with the overcurrent fault detect, this gives the system a way to distinguish a short from an open circuit.
If the supply stays in current limit beyond a programmable time, the MOSFET turns off, PWRGD goes low and the part either restarts after a timeout or latches off until the UV pin is cycled, according to the RETRY pin. Undervoltage and overvoltage thresholds are set by an external divider and are accurate to 1 percent, and PWRGD reports when the output has risen past its programmed level.
The LT4256-3IGN is the industrial grade part in the 16-Lead Plastic SSOP package, specified from -40 to 85 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 LT4256-3IGN products new stock?
Yes. Every part we ship is new stock sourced through established supply channels, with full traceability.
Which package does the LT4256-3IGN use?
It is supplied in the 16-Lead Plastic SSOP package, the industrial grade version specified from -40 to 85 degrees C.
What supply voltage range does the LT4256-3IGN support?
It controls supplies from 10.8 V to 80 V, which covers 12 V, 24 V and 48 V distributed power systems.
What does the OPEN output detect?
It flags abnormally low load current, which indicates an unplugged load, a blown fuse or an open MOSFET that a current limit alone would not catch.
How does the LT4256-3IGN behave after a long overcurrent?
The MOSFET turns off and PWRGD goes low; the RETRY pin selects either automatic restart after a timeout or latchoff until the UV pin is cycled.
How accurate are the thresholds?
The overvoltage and undervoltage thresholds set by the external divider are accurate to 1 percent, and PWRGD reports when the output passes its programmed level.
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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