Features and Benefits
- Complete Power Interface Port for IEEE 802®.3af Powered Device (PD)
- On-board 100V, UVLO Switch
- Precision Dual Level Inrush Current Limit
- Integrated Current Mode Switching Regulator
- On-board 25k 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 Package
The LTC4267-1 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 LTC4267-1 integrates the 25k 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 LTC4267-1 provides an increased operational current limit, maximizing power available for class 3 applications.
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 LTC4267-1 includes an on-board error amplifier and voltage reference allowing use in both isolated and nonisolated configurations.
The LTC4267-1 is available in a space saving, low profile 16-pin SSOP package.
- 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.
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