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Tiny dual Hot Swap controller targets optical networks

Milpitas, Calif.—Linear Technology Corp. has introduced the LTC4224, a compact, low voltage Hot Swap controller for protecting boards and backplanes that use two 1V to 6V voltage supplies.

The LTC4224 is suitable for optical networking, as well as low voltage Hot Swap control and electronic circuit breaker applications, especially in cases where space is very limited. An internal diode OR circuit ensures that the LTC4224 is properly supplied with power by one of the two monitored supplies, whichever is greater, both of which can be turned on and off independently. This allows the LTC4224 to control a supply voltage as low as 1V, provided the other supply is 2.7V or greater.

An adjustable current limit allows users to match the current limit threshold to their load while a 5ms electronic circuit breaker monitors for an overcurrent condition and protects the external MOSFETs against shorts or excessive load currents. Peak fault currents are controlled in less than 1µs and an optional gate capacitor can be used to adjust the gate slew rate. Otherwise, all traditional Hot Swap timing parameters are internally generated to save board area if minimization of components is desired.

The LTC4224 is offered in two versions: the LTC4224-1 latches off after a fault, whereas the LTC4224-2 provides automatic retry after a fault. Commercial and industrial grades offer different operating temperature ranges from 0°C to 70°C and -40°C to 85°C, respectively. The LTC4224 is available in 10-lead 3mm x 2mm DFN or 10-lead MSOP RoHS compliant packages.

Pricing: Starts at $2.40 each in 1,000 piece quantities.
Availability: Now.
Datasheet: Click here.

Linear Technology, www.linear.com

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