LTC4253A-ADJ
Obsolete-48V Hot Swap Controller with Sequencer
Overview
- Obsolete - Contact Analog Devices for Potential Replacement
- Allows Safe Board Insertion and Removal from a Live – 48V Backplane
- Floating Topology Permits Very High Voltage Operation
- Adjustable Analog Current Limit with Breaker Timer
- Fast Response Time Limits Peak Fault Current
- Adjustable Undervoltage/Overvoltage Protection with ±1% Threshold Accuracy
- Three Sequenced Power Good Outputs
- Adjustable Soft-Start Current Limit
- Adjustable Timer with Drain Voltage Accelerated Response
- Latchoff After Fault
- Available in 20-Pin SSOP and 20-Pin (4mm × 4mm) QFN Packages
The LTC4253A-ADJ negative voltage Hot Swap™ controller allows a board to be safely inserted and removed from a live backplane. Output current is controlled by three stages of current-limiting: a timed circuit breaker, active current limiting and a fast feedforward path that limits peak current under worst-case catastrophic fault conditions. The LTC4253A-ADJ latches off after a circuit fault.
Undervoltage and overvoltage detectors with adjustable thresholds and hystereses disconnect the load whenever the input supply exceeds the desired operating range. The LTC4253A-ADJ's supply input is shunt-regulated, allowing safe operation with very high supply voltages. A multifunction timer delays initial start-up and controls the circuit breaker's response time. The circuit breaker's response time can be accelerated by sensing excessive MOSFET drain voltage. An adjustable soft-start circuit controls MOSFET inrush current at start-up.
Three power good outputs can be sequenced to enable external power modules at start-up or disable them if the circuit breaker trips. The LTC4253A-ADJ is available in 20-pin SSOP and 20-pin (4mm × 4mm) QFN packages.
| Notes | |
| LTC4253 | |
| LTC4253A | Recommend LTC4253B for new designs |
| LTC4253A-ADJ | Recommend LTC4253B for new designs |
| LTC4253B |
Applications
- -48V Distributed Power Systems
- Negative Power Supply Control
- Central Office Switching
- High Availability Servers
- Disk Arrays
Documentation
Data Sheet 1
Technical Articles 1
Product Selector Card 1
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC4253B | RECOMMENDED FOR NEW DESIGNS | –48V Hot Swap Controller with Sequencer |
Latest Discussions
No discussions on LTC4253A-ADJ yet. Have something to say?
Start a Discussion on EngineerZone®