DocumentationDatasheet
Reliability Data
Product Selector Card
LT Journal
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Features
- Allows Safe Board Insertion and Removal from a Live –48V Backplane
- Floating Topology Permits Very High Voltage Operation
- Programmable Analog Current Limit with Circuit Breaker Timer
- Fast Response Time Limits Peak Fault Current
- Improved Ruggedness Shunt Regulator
- Programmable Timer
- Programmable Undervoltage/Overvoltage Protection
- Low Profile 6-Lead SOT-23 (ThinSOT™) Package
Typical Application
Description
The LTC®4251B/LTC4251B-1/LTC4251B-2 negative voltage Hot Swap™ controllers allow 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.
Programmable undervoltage and overvoltage detectors disconnect the load whenever the input supply exceeds the desired operating range. The 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 LTC4251B UV/OV thresholds are designed to match the standard telecom operating range of – 43V to –75V. The LTC4251B-1 UV/OV thresholds extend the operating range to encompass –36V to –72V. The LTC4251B-2 implements a UV threshold of –43V only. The LTC4251B improves the ruggedness of the LTC4251 shunt regulator.
| UV/OV |
|
| LTC4251 | -43V / -75V |
| LTC4251-1 | -36V / -72V |
| LTC4251-2 | -43V UV Only |
| LTC4251B | -43V / -75V |
| LTC4251B-1 | -36V / -72V |
| LTC4251B-2 | -43V UV Only |
SOT-23,
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC4251-1CS6#PBF | SOT | 6 | C | $2.36 | |
| LTC4251-1CS6#TRMPBF | SOT | 6 | C | $2.36 | $2.06 |
| LTC4251-1CS6#TRPBF | SOT | 6 | C | $2.36 | $2.01 |
| LTC4251-1IS6#PBF | SOT | 6 | I | $2.66 | |
| LTC4251-1IS6#TRMPBF | SOT | 6 | I | $2.66 | $2.31 |
| LTC4251-1IS6#TRPBF | SOT | 6 | I | $2.66 | $2.26 |
| LTC4251-2CS6#PBF | SOT | 6 | C | $2.36 | |
| LTC4251-2CS6#TRMPBF | SOT | 6 | C | $2.36 | $2.06 |
| LTC4251-2CS6#TRPBF | SOT | 6 | C | $2.36 | $2.01 |
| LTC4251-2IS6#PBF | SOT | 6 | I | $2.66 | |
| LTC4251-2IS6#TRMPBF | SOT | 6 | I | $2.66 | $2.31 |
| LTC4251-2IS6#TRPBF | SOT | 6 | I | $2.66 | $2.26 |
| LTC4251BCS6#PBF | SOT | 6 | C | $2.36 | |
| LTC4251BCS6#TRMPBF | SOT | 6 | C | $2.36 | $2.06 |
| LTC4251BCS6#TRPBF | SOT | 6 | C | $2.36 | $2.01 |
| LTC4251BCS6-1#PBF | SOT | 6 | C | $2.36 | |
| LTC4251BCS6-1#TRMPBF | SOT | 6 | C | $2.36 | $2.06 |
| LTC4251BCS6-1#TRPBF | SOT | 6 | C | $2.36 | $2.01 |
| LTC4251BCS6-2#PBF | SOT | 6 | C | $2.36 | |
| LTC4251BCS6-2#TRMPBF | SOT | 6 | C | $2.36 | $2.06 |
| LTC4251BCS6-2#TRPBF | SOT | 6 | C | $2.36 | $2.01 |
| LTC4251BIS6#PBF | SOT | 6 | I | $2.66 | |
| LTC4251BIS6#TRMPBF | SOT | 6 | I | $2.66 | $2.31 |
| LTC4251BIS6#TRPBF | SOT | 6 | I | $2.66 | $2.26 |
| LTC4251BIS6-1#PBF | SOT | 6 | I | $2.66 | |
| LTC4251BIS6-1#TRMPBF | SOT | 6 | I | $2.66 | $2.31 |
| LTC4251BIS6-1#TRPBF | SOT | 6 | I | $2.66 | $2.26 |
| LTC4251BIS6-2#PBF | SOT | 6 | I | $2.66 | |
| LTC4251BIS6-2#TRMPBF | SOT | 6 | I | $2.66 | $2.31 |
| LTC4251BIS6-2#TRPBF | SOT | 6 | I | $2.66 | $2.26 |
| LTC4251CS6#PBF | SOT | 6 | C | $2.36 | |
| LTC4251CS6#TRMPBF | SOT | 6 | C | $2.36 | $2.06 |
| LTC4251CS6#TRPBF | SOT | 6 | C | $2.36 | $2.01 |
| LTC4251IS6#PBF | SOT | 6 | I | $2.66 | |
| LTC4251IS6#TRMPBF | SOT | 6 | I | $2.66 | $2.31 |
| LTC4251IS6#TRPBF | SOT | 6 | I | $2.66 | $2.26 |
| LTC4251CS6 | SOT | 6 | C | $4.72 | |
| LTC4251CS6#TR | SOT | 6 | C | $4.72 | $4.02 |
| LTC4251IS6 | SOT | 6 | I | $5.32 | |
| LTC4251IS6#TR | SOT | 6 | I | $5.32 | $4.52 |
| LTC4251-1CS6 | SO | 6 | C | $4.72 | |
| LTC4251-1CS6#TR | SOT | 6 | C | $4.72 | $4.02 |
| LTC4251-1IS6 | SOT | 6 | I | $5.32 | |
| LTC4251-1IS6#TR | SOT | 6 | I | $5.32 | $4.52 |
| LTC4251-2CS6 | SOT | 6 | C | $4.72 | |
| LTC4251-2CS6#TR | SOT | 6 | C | $4.72 | $4.02 |
| LTC4251-2IS6 | SOT | 6 | I | $5.32 | |
| LTC4251-2IS6#TR | SOT | 6 | I | $5.32 | $4.52 |
| LTC4251-1CS6#TRM | SOT | 6 | C | $4.72 | $4.12 |
| LTC4251-1IS6#TRM | SOT | 6 | I | $5.32 | $4.62 |
| LTC4251-2CS6#TRM | SOT | 6 | C | $4.72 | $4.12 |
| LTC4251-2IS6#TRM | SOT | 6 | I | $5.32 | $4.62 |
| LTC4251CS6#TRM | SOT | 6 | C | $4.72 | $4.12 |
| LTC4251IS6#TRM | SOT | 6 | I | $5.32 | $4.62 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.