LTC4261
PRODUCTIONNegative Voltage Hot Swap Controllers with ADC and I²C Monitoring
- Part Models
- 16
- 1ku List Price
- Starting From $8.13
Overview
- Allows Safe Insertion into Live –48V Backplanes
- 10-Bit ADC Monitors Current and Voltages
- I2C/SMBus Interface or Single-Wire Broadcast Mode
- Floating Topology Allows Very High Voltage Operation
- Independently Adjustable Inrush and Overcurrent Limits
- Controlled Soft-Start Inrush
- Adjustable UV/OV Thresholds and Hysteresis
- Sequenced Power Good Outputs with Delays
- Adjustable Power Good Input Timeout
- Programmable Latchoff or Auto-Retry After Faults
- Alerts Host After Faults
- Available in 28-Lead Narrow SSOP and 24-Lead (4mm × 5mm) QFN Packages
The LTC4261/LTC4261-2 negative voltage Hot Swap™ controllers allow a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, the board supply voltage can be ramped at an adjustable rate. The devices feature independently adjustable inrush current and overcurrent limits to minimize stresses on the pass transistor during start-up, input step and output short conditions. The LTC4261 defaults to latch-off while the LTC4261-2 defaults to auto-retry on overcurrent faults.
An I2C interface and onboard 10-bit ADC allow monitoring of board current, voltage and fault status. A single-wire broadcast mode is available to simplify the interface by eliminating two optoisolators.
The controllers have additional features to interrupt the host when a fault has occurred, notify when output power is good, detect insertion of a board and turn off the pass transistor if an external supply monitor fails to indicate power good within a timeout period.
Applications
- AdvancedTCA Systems
- Telecom Infrastructure
- –48V Distributed Power Systems
- Power Monitors
Documentation
Data Sheet 1
User Guide 1
Design Note 1
Technical Articles 2
Product Selector Card 2
Webcast 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 |
|---|---|---|---|
| LTC4261CGN#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4261CGN#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4261CGN-2#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4261CGN-2#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4261CUFD#PBF | 24-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC4261CUFD#TRPBF | 24-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC4261CUFD-2#PBF | 24-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC4261CUFD-2#TRPBF | 24-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC4261IGN#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4261IGN#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4261IGN-2#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4261IGN-2#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC4261IUFD#PBF | 24-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC4261IUFD#TRPBF | 24-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC4261IUFD-2#PBF | 24-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC4261IUFD-2#TRPBF | 24-Lead QFN (4mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL |
||
| LTC4261CGN#PBF | PRODUCTION | |
| LTC4261CGN#TRPBF | PRODUCTION | |
| LTC4261CGN-2#PBF | PRODUCTION | |
| LTC4261CGN-2#TRPBF | PRODUCTION | |
| LTC4261IGN#PBF | PRODUCTION | |
| LTC4261IGN#TRPBF | PRODUCTION | |
| LTC4261IGN-2#PBF | PRODUCTION | |
| LTC4261IGN-2#TRPBF | PRODUCTION | |
|
Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking |
||
| LTC4261CGN-2#PBF | PRODUCTION | |
| LTC4261CGN-2#TRPBF | PRODUCTION | |
| LTC4261IGN-2#PBF | PRODUCTION | |
| LTC4261IGN-2#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 |
|---|---|---|
| Ideal Diodes and PowerPath Controllers 1 | ||
| LTC4371 | RECOMMENDED FOR NEW DESIGNS | Dual Negative Voltage Ideal Diode-OR Controller and Monitor |
| MOSFET & Gate Drivers 1 | ||
| LTM9100 | NOT RECOMMENDED FOR NEW DESIGNS | Anyside™ High Voltage Isolated Switch Controller with I2C Command and Telemetry |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC4261
Linduino 3
LTpowerPlay®
LTpowerPlay® is a powerful, Windows-based development environment supporting Linear Technology's Digital Power System Management (PSM) products.
Open ToolLTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.
Linduino code repository on GitHub and instructions on how to use the code.
Evaluation Kits
LTC4261 –48V Hot Swap w/ADC (Requires DC590)
Resources
Reference Designs
