Features and Benefits
- Complete Power Interface Port for IEEE 802®.3af Powered Device (PD)
- Onboard 100V, 400mA UVLO Switch
- Precision Dual Level Inrush Current Limit
- Integrated Current Mode Switching Regulator
- Onboard 25kΩ Signature Resistor with Disable
- Programmable Classiﬁcation Current (Class 0-4)
- Thermal Overload Protection
- Power Good Signal
- Integrated Error Ampliﬁer and Voltage Reference
- Low Proﬁle 16-Pin SSOP and 3mm × 5mm DFN Packages
The LTC4267 combines an IEEE 802.3af compliant Powered Device (PD) interface with a current mode switching regulator, providing a complete power solution for PD applications. The LTC4267 integrates the 25kΩ signature resistor, classiﬁcation current source, thermal overload protection, signature disable and power good signal along with an undervoltage lockout optimized for use with the IEEE-required diode bridge. The precision dual level input current limit allows the LTC4267 to charge large load capacitors and interface with legacy PoE systems.
The current mode switching regulator is designed for driving a 6V rated N-channel MOSFET and features programmable slope compensation, soft-start, and constant frequency operation, minimizing noise even with light loads. The LTC4267 includes an onboard error ampliﬁer and voltage reference allowing use in both isolated and nonisolated conﬁgurations.
The LTC4267 is available in space saving, low proﬁle 16-pin SSOP or DFN packages.
- IP Phone Power Management
- Wireless Access Points
- Security Cameras
- Power over Ethernet
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (4)
Demonstration circuit 1145B, featuring the LTC4267, provides a complete IEEE 802.3af Powered Device (PD) interface and isolated 12V at 0.9A power supply solution for use in Power over Ethernet (PoE) applications. An optional connection is included for a 12V auxiliary supply on the secondary side that disables PoE when present.
Demonstration circuit 804 is a Power over Ethernet PD Interface with Integrated Switching Regulator featuring the LTC4267. It provides a complete IEEE 802.3af power device (PD) interface and isolated 3.3V power supply solution for use in Power over Ethernet (PoE) applications.
DC917A: Demo Board for the LTC4267 Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator.
DC859A: Demo Board for the LTC4267 Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator.
Documentation & Resources
R413 Reliability Data3/26/201826 K
PoE Consortium Clause # 33 PD Conformance Report v1.03/23/2018478K
PoE Consortium Interoperability Report LTC42673/23/2018661 K
DC804B - Demo Manual8/16/2011320K
DC1145B - Demo Manual7/26/2011243K
DC917A - Demo Manual9/24/2009108K
DC859A - Demo Manual9/24/2009348K
Power over Ethernet Solutions4/4/20171 M
PoE PD Controllers6/22/2015552K
PoE+ for the Power Hungry4/28/2010683K
Next Generation Power Over Ethernet7/11/2021
Tools & Simulations
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|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LTC4267CDHC#PBF||Material Declaration||Reliability Data||16-Lead DFN (5mm x 3mm w/ EP)|
|LTC4267CDHC#TRPBF||Material Declaration||Reliability Data||16-Lead DFN (5mm x 3mm w/ EP)|
|LTC4267CGN#PBF||Material Declaration||Reliability Data||16-Lead SSOP (Narrow 0.15 Inch)|
|LTC4267CGN#TRPBF||Material Declaration||Reliability Data||16-Lead SSOP (Narrow 0.15 Inch)|
|LTC4267IDHC#PBF||Material Declaration||Reliability Data||16-Lead DFN (5mm x 3mm w/ EP)|
|LTC4267IDHC#TRPBF||Material Declaration||Reliability Data||16-Lead DFN (5mm x 3mm w/ EP)|
|LTC4267IGN#PBF||Material Declaration||Reliability Data||16-Lead SSOP (Narrow 0.15 Inch)|
|LTC4267IGN#TRPBF||Material Declaration||Reliability Data||16-Lead SSOP (Narrow 0.15 Inch)|
|Wafer Fabrication Data||PoE Consortium Interoperability Report LTC4267|
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