LTC4252B/LTC4252C - Negative Voltage Hot Swap Controllers
The LTC®4252 negative voltage Hot SwapTM 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.
Adjustable undervoltage and overvoltage detectors disconnect the load whenever the input supply exceeds the desired operating range. The LTC4252’s supply input is shunt regulated, allowing safe operation with very high supply voltages. A multifunction timer delays initial startup and controls the circuit breaker’s response time. The circuit breaker’s response time is accelerated by sensing excessive MOSFET drain voltage, keeping the MOSFET within its safe operating area (SOA). An adjustable softstart circuit controls MOSFET inrush current at start-up.
The LTC4252-2 provides automatic retry after a fault. The LTC4252C-1/LTC4252C-2 feature tight ±1% undervoltage/ overvoltage threshold accuracy. The LTC4252 is available in either an 8-pin or 10-pin MSOP.
The LTC4252B and LTC4252C improve the ruggedness of the shunt regulator in the LTC4252 and LTC4252A.
Features
Typical Application  | Applications
Packaging  |
Order Information
| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|---|---|---|---|
| LTC4252BCMS-1#PBF | MS-10 | C | $3.00 | $2.35 |
| LTC4252BCMS-1#TRPBF | MS-10 | C | $2.41 | |
| LTC4252BCMS-2#PBF | MS-10 | C | $3.00 | $2.35 |
| LTC4252BCMS-2#TRPBF | MS-10 | C | $2.41 | |
| LTC4252BCMS8-1#PBF | MS-8 | C | $2.55 | $2.00 |
| LTC4252BCMS8-1#TRPBF | MS-8 | C | $2.06 | |
| LTC4252BCMS8-2#PBF | MS-8 | C | $2.55 | $2.00 |
| LTC4252BCMS8-2#TRPBF | MS-8 | C | $2.06 | |
| LTC4252BIMS-1#PBF | MS-10 | I | $3.40 | $2.65 |
| LTC4252BIMS-1#TRPBF | MS-10 | I | $2.71 | |
| LTC4252BIMS-2#PBF | MS-10 | I | $3.40 | $2.65 |
| LTC4252BIMS-2#TRPBF | MS-10 | I | $2.71 | |
| LTC4252BIMS8-1#PBF | MS-8 | I | $2.90 | $2.30 |
| LTC4252BIMS8-1#TRPBF | MS-8 | I | $2.36 | |
| LTC4252BIMS8-2#PBF | MS-8 | I | $2.90 | $2.30 |
| LTC4252BIMS8-2#TRPBF | MS-8 | I | $2.36 | |
| LTC4252CCMS-1#PBF | MS-10 | C | $3.45 | $2.50 |
| LTC4252CCMS-1#TRPBF | MS-10 | C | $2.56 | |
| LTC4252CCMS-2#PBF | MS-10 | C | $3.45 | $2.50 |
| LTC4252CCMS-2#TRPBF | MS-10 | C | $2.56 | |
| LTC4252CIMS-1#PBF | MS-10 | I | $3.90 | $2.90 |
| LTC4252CIMS-1#TRPBF | MS-10 | I | $2.96 | |
| LTC4252CIMS-2#PBF | MS-10 | I | $3.90 | $2.90 |
| LTC4252CIMS-2#TRPBF | MS-10 | I | $2.96 |
Demo Boards
| Part Number | Description | Price |
|---|---|---|
| DC787A-A | LTC4252CCMS-1 Demoboard | Negative Voltage Hot Swap Controller in an AdvancedTCA Application, Latch Off After Fault | $75.00 |
| DC787A-B | LTC4252CCMS-2 Demoboard | Negative Voltage Hot Swap Controller in an AdvancedTCA Application, Auto Retry After Fault | $75.00 |
