LT4294
PRODUCTIONIEEE 802.3bt PD Interface Controller
- Part Models
- 8
- 1ku List Price
- Starting From $2.31
Overview
- IEEE 802.3af/at/bt Powered Device (PD) Controller
- Supports Up to 71.3W PDs
- 5-Event Classification Sensing
- Superior Surge Protection (100V Absolute Maximum)
- Wide Junction Temperature Range (–40°C to 125°C)
- Overtemperature Protection
- Integrated Signature Resistor
- External Hot Swap N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency
- Configurable Aux Power Support as Low as 9V
- Easy Migration Between LTPoE++® PDs and IEEE 802.3bt PDs
- Pin Compatible with LT4275A/B/C
- Available in 10-Lead MSOP and 3mm × 3mm DFN Packages
The LT4294 is an IEEE 802.3af/at/bt-compliant powered device (PD) interface controller. The T2P output indicates the number of classification events received during IEEE 802.3bt-compliant mutual identification and negotiation of available power.
The LT4294 utilizes an external, low RDS(ON) N-channel hot swap MOSFET and supports the LT4320/LT4321 ideal diode bridges, to extend the end-to-end power delivery efficiency and eliminate costly heat sinks. The LT4294 also includes a power good output, onboard signature resistor, undervoltage lockout, and thermal protection. Start-up inrush current is adjustable with an external capacitor. Auxiliary power override is supported as low as 9V with the AUX pin.
The LT4294 can be configured to support all possible 802.3bt, 802.3at and 802.3af power levels with external component changes. Pin-for-pin compatibility with the LT4275 family of PD Interface Controllers enables easy migration between LTPoE++ PDs and IEEE 802.3bt-compliant PDs.
Applications
- High Power Wireless Data Systems
- Outdoor Security Camera Equipment
- Commercial and Public Information Displays
- High Temperature Industrial Applications
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
Video 2
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 |
|---|---|---|---|
| LT4294HDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4294HDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4294HMS#PBF | 10-Lead MSOP | ||
| LT4294HMS#TRPBF | 10-Lead MSOP | ||
| LT4294IDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4294IDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT4294IMS#PBF | 10-Lead MSOP | ||
| LT4294IMS#TRPBF | 10-Lead MSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
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| LT4294HDD#PBF | PRODUCTION | |
| LT4294HDD#TRPBF | PRODUCTION | |
| LT4294HMS#PBF | PRODUCTION | |
| LT4294HMS#TRPBF | PRODUCTION | |
| LT4294IDD#PBF | PRODUCTION | |
| LT4294IDD#TRPBF | PRODUCTION | |
| LT4294IMS#PBF | PRODUCTION | |
| LT4294IMS#TRPBF | PRODUCTION | |
|
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2) |
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| LT4294HMS#PBF | PRODUCTION | |
| LT4294HMS#TRPBF | PRODUCTION | |
| LT4294IMS#PBF | PRODUCTION | |
| LT4294IMS#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC |
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| LT4294HMS#PBF | PRODUCTION | |
| LT4294HMS#TRPBF | PRODUCTION | |
| LT4294IMS#PBF | PRODUCTION | |
| LT4294IMS#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 | ||
|
LT4320 LT4320-1 |
Ideal Diode Bridge Controller | |
| Power-over-Ethernet (PoE) Controllers 1 | ||
| LT4321 | RECOMMENDED FOR NEW DESIGNS | PoE Ideal Diode Bridge Controller |
| Parts | Product Life Cycle | Description |
|---|---|---|
| LT4295 | RECOMMENDED FOR NEW DESIGNS | IEEE 802.3bt PD Interface with Forward/Flyback Controller |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT4294
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
LT4294/LT4321 Demo Board | PoE++ (71W/37V to 57V) PD and Ideal Diode Bridge