LT4250
RECOMMENDED FOR NEW DESIGNSNegative 48V Hot Swap Controller
- Part Models
- 12
- 1ku List Price
- Starting From $3.44
Overview
- Allows Safe Board Insertion and Removal from a Live –48V Backplane
- Circuit Breaker Immunity to Voltage Steps and Current Spikes
- Programmable Inrush and Short-Circuit Current Limits
- Pin Compatible with LT1640L/LT1640H
- Operates from –18V to –80V
- Programmable Overvoltage Protection
- Programmable Undervoltage Lockout
- Power Good Control Output
- Bell-Core Compatible ON/OFF Threshold
The LT4250L/LT4250H are 8-pin, negative 48V Hot Swap™ controllers that allow a board to be safely inserted and removed from a live backplane. Inrush current is limited to a programmable value by controlling the gate voltage of an external N-channel pass transistor. The pass transistor is turned off if the input voltage is less than the programmable undervoltage threshold or greater than the overvoltage threshold. A programmable current limit protects the system against shorts. After a 500μs timeout the current limit activates the electronic circuit breaker. The PWRGD (LT4250L) or PWRGD (LT4250H) signal can be used to directly enable a power module. The LT4250L is designed for modules with a low enable input and the LT4250H for modules with a high enable input.
The LT4250L/LT4250H are available in 8-pin PDIP and SO packages
Applications
- Central Office Switching
- –48V Distributed Power Systems
- Negative Power Supply Control
Documentation
Data Sheet 1
User Guide 1
Design Note 1
Technical Articles 1
Product Selector Card 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT4250HCN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT4250HCS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT4250HCS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT4250HIN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT4250HIS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT4250HIS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT4250LCN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT4250LCS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT4250LCS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT4250LIN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT4250LIS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT4250LIS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 8, 2024 - 24_0234 Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package |
||
| LT4250HCN8#PBF | PRODUCTION | |
| LT4250HIN8#PBF | PRODUCTION | |
| LT4250LCN8#PBF | PRODUCTION | |
| LT4250LIN8#PBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0241 Epoxy Change from Henkel 8290 to 8290A for PDIP Package |
||
| LT4250HCN8#PBF | PRODUCTION | |
| LT4250HIN8#PBF | PRODUCTION | |
| LT4250LCN8#PBF | PRODUCTION | |
| LT4250LIN8#PBF | PRODUCTION | |
|
Aug 6, 2022 - 22_0172 Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG] |
||
| LT4250HCN8#PBF | PRODUCTION | |
| LT4250HIN8#PBF | PRODUCTION | |
| LT4250LCN8#PBF | PRODUCTION | |
| LT4250LIN8#PBF | PRODUCTION | |
|
Oct 24, 2024 - 24_0246 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package |
||
| LT4250HCS8#PBF | PRODUCTION | |
| LT4250HCS8#TRPBF | PRODUCTION | |
| LT4250HIS8#PBF | PRODUCTION | |
| LT4250HIS8#TRPBF | PRODUCTION | |
| LT4250LCS8#PBF | PRODUCTION | |
| LT4250LCS8#TRPBF | PRODUCTION | |
| LT4250LIS8#PBF | PRODUCTION | |
| LT4250LIS8#TRPBF | PRODUCTION | |
|
Oct 12, 2022 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2) |
||
| LT4250HCS8#PBF | PRODUCTION | |
| LT4250HCS8#TRPBF | PRODUCTION | |
| LT4250HIS8#PBF | PRODUCTION | |
| LT4250HIS8#TRPBF | PRODUCTION | |
| LT4250LCS8#PBF | PRODUCTION | |
| LT4250LCS8#TRPBF | PRODUCTION | |
| LT4250LIS8#PBF | PRODUCTION | |
| LT4250LIS8#TRPBF | PRODUCTION | |
|
Jun 16, 2021 - 21_0026 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LT4250HCS8#PBF | PRODUCTION | |
| LT4250HCS8#TRPBF | PRODUCTION | |
| LT4250HIS8#PBF | PRODUCTION | |
| LT4250HIS8#TRPBF | PRODUCTION | |
| LT4250LCS8#PBF | PRODUCTION | |
| LT4250LCS8#TRPBF | PRODUCTION | |
| LT4250LIS8#PBF | PRODUCTION | |
| LT4250LIS8#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Hot Swap Controllers 2 | ||
|
LTC4252 LTC4252A |
Negative Voltage Hot Swap Controllers | |
| LTC4251 | RECOMMENDED FOR NEW DESIGNS | Negative Voltage Hot Swap Controllers in SOT-23 |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT4250H
- LT4250L
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.
Evaluation Kits
LT4250LCS8 | Negative Voltage Hot Swap Controller