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Dual Supply Hot Swap Controller Optimized for AdvancedTCA Mezzanine Cards
The LTC4223 provides independently controlled turn-on and shutdown of the 12V main and 3.3V auxiliary supply rails used on the mezzanine card. The main 12V rail is controlled via an external N-channel MOSFET, while the 3.3V rail uses an integrated 0.3 Ohm switch for auxiliary or management power up to 165mA. For the 12V rail, key features include a fast acting current limit in the event of short circuit faults, with guaranteed 5% accuracy. An external current sense resistor adjusts the current trip threshold. The LTC4223 also provides a 12V current sense monitoring output that can be connected to a low cost ADC like the LTC2450. Separate Power Good outputs are available with 3% accurate thresholds set 10% and 15% below the 12V and 3.3V rails, respectively. A fault output alerts the host processor if an overcurrent fault has occurred on either supply, while a separate VCC pin decouples the IC supply from faults on the 3.3V rail. The LTC4223 includes a gate-source clamp to protect the external MOSFET from hard shorts on the output. Absolute maximum ratings of 20V and 10V for the respective supplies ensure ruggedness when confronted with short overvoltage spikes and ringing present in harsh Hot Swap environments.
The LTC4223 is offered in two versions: the LTC4223-1 latches off after a fault, the LTC4223-2 provides automatic retry after a fault. Specified over the commercial and industrial temperature ranges, the LTC4223 is offered in 16-lead SSOP and 5mm x 4mm DFN packages, available today. Linear Technology offers a wide portfolio of products that support AdvancedTCA platforms. Visit the ATCA solutions page at www.linear.com.
Summary of Features: LTC4223
- Allows Safe Insertion into Live AMC or MicroTCA Backplane
- Controls 12V Main and 3.3V Auxiliary supplies
- Limits Peak Fault Current in ¡Â1us
- Adjustable Current Limit with Circuit Breaker
- Integrated 0.3 Ohm AUX Switch
- High Side Current Sense
- LTC4223-1:Latch Off After Fault
- LTC4223-2: Automatic Retry After Fault
- 16-Lead SSOP & 5mm x 4mm DFN Packages
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