LTC4261CGN-2 28-Lead SSOP Negative Voltage Hot Swap Controller with ADC and I2C Monitoring
The LTC4261CGN-2 is a negative voltage hot swap controller for boards that plug into a live -48 V backplane. An external N-channel pass transistor ramps the board supply at an adjustable rate, and the floating topology lets the part sit at the negative rail while its control pins stay referenced to system ground through simple level shifting.
A 10-bit ADC and an I2C / SMBus interface let the host read board current, voltages and fault status. A single-wire broadcast mode is also provided, which removes two optoisolators from an isolated control path and simplifies the wiring between the card and the shelf controller.
Inrush current and overcurrent limits are set independently, so the start-up profile can be gentle while the running limit stays tight enough to protect the pass transistor during an input step or an output short. Soft-start timing is set with an external capacitor on the TMR pin, and the gate drive is current limited to keep the MOSFET inside its safe operating area.
This is the -2 version, which defaults to auto-retry on an overcurrent fault, so the card retries by itself once the fault clears. A power good input timeout turns the pass transistor off if an external supply monitor does not report good within the programmed window, and the ALERT output interrupts the host after any fault.
The LTC4261CGN-2 is the commercial grade part in the 28-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 LTC4261CGN-2 products new stock?
Yes. Every part we ship is new stock sourced through established supply channels, with full traceability.
Which package does the LTC4261CGN-2 use?
It is supplied in the 28-Lead Plastic SSOP package, the commercial grade version specified from 0 to 70 degrees C.
What is the LTC4261 used for?
It is a negative voltage hot swap controller for -48 V systems, with a 10-bit ADC and I2C monitoring of board current, voltages and fault status.
What is the difference between the LTC4261 and LTC4261-2?
The LTC4261 defaults to latchoff after an overcurrent fault; the LTC4261-2 defaults to auto-retry, so the card restarts once the fault clears.
Are inrush and overcurrent limits adjustable separately?
Yes. The two limits are set independently, so start-up can be gentle while the running limit stays tight enough to protect the pass transistor.
Can the host read telemetry from the LTC4261CGN-2?
Yes. The 10-bit ADC reports current and voltages over I2C / SMBus, and a single-wire broadcast mode can be used instead to save optoisolators.
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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