Features and Benefits
- Allows Safe Board Insertion into Live Backplane
- Selectable Current Limit and Dual-Rate Timer Accommodate Load Surges
- Fast Response Limits Peak Fault Current
- Wide Operating Voltage Range: 4.5V to 44V
- Optional Auto-Retry or Latchoff after Overcurrent Fault
- High Side Drive for External N-Channel MOSFET
- Allows Parallel Power Paths for High Current Applications
- Available in 16-Pin QFN (3mm × 3mm) and MSOP Packages
The LTC4226 dual Hot Swap™ controller allows two power paths to be safely inserted and removed from a live backplane or powered connector. Using N-channel pass transistors, supply voltages ranging from 4.5V to 44V are ramped up at an adjustable rate.
Three selectable ratios of current limit to circuit breaker threshold accommodate noisy loads and momentary high peak currents without interruption, while a dual-rate fault timer protects the MOSFET from extended output overcurrent events. FAULT outputs indicate the circuit breaker status.The LTC4226-1 remains off after a fault while the LTC4226-2 automatically retries after a 0.5s delay.
The LTC4226 can also be configured as a bidirectional current limiter/circuit breaker. For high current applications, two channels may be configured as parallel power paths.
- Apple FireWire/IEEE 1394
- Disk Drives
- Rugged 12V, 24V Applications
- Hot Board/Connector Insertion
- Uni/Bidirectional Current Limiter/Circuit Breaker
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Documentation & Resources
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
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Models for the following parts are available in LTspice:
LTC4226 Companion Parts
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Sample & Buy
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Buy Now Pricing
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.