The LTC4267IGN-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 LTC4267IGN-1 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 LTC4267IGN-1 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 LTC4267IGN-1 includes an onboard error amplifier and voltage reference allowing use in both isolated and nonisolated configurations.
The LTC4267IGN-1 is available in space saving, low profile 16-pin SSOP or DFN packages.
Feature
- 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
Applications
- IP Phone Power Management
- Wireless Access Points
- Security Cameras
- Power over Ethernet
(Picture: Pinout)
