LT4256-3
RECOMMENDED FOR NEW DESIGNSPositive High Voltage Hot Swap Controller with Open-Circuit Detect
- Part Models
- 4
- 1ku List Price
- Starting From $3.56
Overview
- Allows Safe Board Insertion and Removal from a Live Backplane
- Controls Supply Voltage from 10.8V to 80V
- Foldback Current Limiting
- Open Circuit and Overcurrent Fault Detect
- Drives an External N-Channel MOSFET
- Automatic Retry or Latched Off Operation After Overcurrent Fault
- Programmable Supply Voltage Power-Up Rate
- Open MOSFET Detection
- 1% Over and Undervoltage Detection Accuracy
- Available in a 16-Lead SSOP Package
The LT4256-3 is a high voltage Hot Swap™ controller that allows a board to be safely inserted and removed from a live backplane. An internal driver controls the high side N-channel MOSFET gate for supply voltages ranging from 10.8V to 80V. The part features an open-circuit detect (OPEN) output that indicates abnormally low load current conditions.
The LT4256-3 also features an adjustable analog foldback current limit. If the supply remains in current limit for more than a programmable time, the N-channel MOSFET shuts off, the PWRGD output asserts low and the LT4256-3 either automatically restarts after a time-out delay or latches off until the UV pin is cycled low (depending on the status of the RETRY pin).
The PWRGD output indicates when the output voltage rises above a programmed level. An external resistor string from VCC provides programmable undervoltage and overvoltage protection.
The LT4256-3 is available in a 16-lead SSOP package.
| Retry / Latch Off | Features | Package | |
| LT4256-1 | Latch Off | UV | SO-8 |
| LT4256-2 | Retry | UV | SO-8 |
| LT4256-3 | Latch Off or Retry | UV/OV, Open Circuit Detect | SSOP-16 |
Applications
- Hot Board Insertion
- Electronic Circuit Breaker/Power Bussing
- Industrial High Side Switch/Circuit Breaker
- 24V/48V Industrial/Alarm Systems
- Ideally Suited for 12V, 24V and 48V Distributed Power Systems
- 48V Telecom Systems
Documentation
Data Sheet 1
User Guide 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 |
|---|---|---|---|
| LT4256-3CGN#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LT4256-3CGN#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LT4256-3IGN#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LT4256-3IGN#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking |
||
| LT4256-3CGN#PBF | PRODUCTION | |
| LT4256-3CGN#TRPBF | PRODUCTION | |
| LT4256-3IGN#PBF | PRODUCTION | |
| LT4256-3IGN#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG] |
||
| LT4256-3CGN#PBF | PRODUCTION | |
| LT4256-3CGN#TRPBF | PRODUCTION | |
| LT4256-3IGN#PBF | PRODUCTION | |
| LT4256-3IGN#TRPBF | PRODUCTION | |
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 |
|---|---|---|
| Hot Swap Controllers 1 | ||
| LTC4260 | RECOMMENDED FOR NEW DESIGNS | Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT4256-1
- LT4256-2
- LT4256-3
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
LT4256-3 Positive Voltage Hot Swap Controller
Resources
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